The RLC control software controls the lights in the roof, the lights on cab frame, the rear window heater and the rear window wiper. The RLC control software is included in the roof control unit.
The control software directly receives signals from:
– Right Dome Light with Switch/Console Light, Component Information
The control software additionally receives signals via the vehicle CAN bus (500 kBd). The signals are processed within the RLC control software. The outputs to the following components are activated depending on the incoming signals:
– Left Clearance Light (ECE)
– Right Clearance Light (ECE)
– Left Headlight on Cab Frame
– Right Headlight on Cab Frame
– License Plate Light (Left)
– License Plate Light (Right)
– Left Beacon Light
– Right Beacon Light
– Left Xenon (HID) Worklight on Rear of Roof
– Right Xenon (HID) Worklight on Rear of Roof
– Left Worklight on Cab Frame or Left Xenon (HID) Worklight on Cab Frame
– Right Worklight on Cab Frame or Right Xenon (HID) Worklight on Cab Frame
– Left Xenon (HID) Worklight on Front of Roof
– Right Xenon (HID) Worklight on Front of Roof
– Left Rear Turn-Signal Light
– Right Rear Turn-Signal Light
– Left Dome Light
– Right Dome Light with Switch/Console Light
– Left Inner Worklight on Rear of Roof
– Right Inner Worklight on Rear of Roof
– Left Outer Worklight on Rear of Roof
– Right Outer Worklight on Rear of Roof
– Left Side-Facing Worklight on Rear of Roof
– Right Side-Facing Worklight on Rear of Roof
– Left Inner Worklight on Front of Roof
– Right Inner Worklight on Front of Roof
– Left Outer Worklight on Front of Roof
– Right Outer Worklight on Front of Roof
– Left Middle Worklight on Front of Roof
– Right Middle Worklight on Front of Roof
– Left Front Turn-Signal Light (ECE)
– Right Front Turn-Signal Light (ECE)
– Left Turn Signal Light on Front of Roof (SAE)
– Right Turn Signal Light on Front of Roof (SAE)
– Left Rear Turn-Signal Light in Roof (SAE)
– Right Turn-Signal Light on Rear of Roof (SAE)
– Right Extra-Wide Vehicle Turn-Signal Light (SAE)
– Left Extra-Wide Vehicle Turn-Signal Light (SAE)
– Rear Window Wiper Motor
– Heated Rear Window
John Deere RLC fault codes / John Deere RLC diagnostic trouble codes
NOTE:This page only indicates the meaning of the fault codes. For complete troubleshooting information, see the technical manuals.
RLC 000158.00 (RLC 158.00)— Control Software, Supply Voltage (ELX) Too High
Supply voltage (ELX) is above 15.5 volts with engine speed above 500 rpm.
Reaction of the control software: Limited or no function of the control software.
RLC 000158.01 (RLC 158.01)— Control Software, Supply Voltage (ELX) Too Low
Supply voltage (ELX) is below 12.5 volts with engine speed above 1500 rpm.
Reaction of the control software: Limited or no function of the control software.
RLC 000158.03 (RLC 158.03)— Control Software, Supply Voltage (ELX) Too High
Supply voltage (ELX) above 16 V.
Reaction of the control software: Limited or no function of the control software.
RLC 000158.04 (RLC 158.04)— Control Software, Supply Voltage (ELX) Too Low
Supply voltage (ELX) below 9 V.
Reaction of the control software: Limited or no function of the control software.
RLC 000158.17 (RLC 158.17)— Control Software, Supply Voltage (ELX) Too Low
Supply voltage (ELX) is below 11.2 volts with engine speed below 500 rpm.
Reaction of the control software: Limited or no function of the control software.
RLC 000158.18 (RLC 158.18)— Control Software, Supply Voltage (ELX) Too Low
Supply voltage (ELX) is below 11.2 volts with engine speed between 500 and 1500 rpm.
Reaction of the control software: Limited or no function of the control software.
RLC 000444.03 (RLC 444.03)— Control Software, Supply Voltage (BAT at Terminal J4) Too High
Supply voltage (BAT) above 16 V.
Reaction of the control software: Limited or no function of the control software.
RLC 000444.04 (RLC 444.04)— Control Software, Supply Voltage (BAT at Terminal J4) Too Low
Supply voltage (BAT) below 9 V.
Reaction of the control software: Limited or no function of the control software.
RLC 000444.06 (RLC 444.06)— Control Software, Current (Pin J4) Too High
Total current at input (pin J4) too high. This indicates a short to ground in one of the control unit circuits. The RLC control software shuts down its functions one after the other.
Reaction of the control software: Limited or no function of the control software.
RLC 000628.02 (RLC 628.02)— Control Software, Internal Error
Error when reading the internal module (EEPROM).
Reaction of the control software: Limited or no function of the control software.
RLC 000628.12 (RLC 628.12)— Control Software, Internal Error
A fault occurred when the software was launched.
Reaction of the control software: Limited or no function of the control software.
RLC 000629.12 (RLC 629.12)— Control Software, Internal Error
A fault occurred when the software was launched (watchdog).
Reaction of the control software: Limited or no function of the control software.
RLC 000630.02 (RLC 630.02)— Control Software, Internal Error
A fault occurred when the software was launched.
Reaction of the control software: Limited or no function of the control software.
RLC 000630.13 (RLC 630.13)— Control Software, Internal Error
A fault occurred when the software was launched.
Reaction of the control software: Limited or no function of the control software.
RLC 000630.14 (RLC 630.14)— Control Software, Internal Error
A fault occurred when the software was launched.
Reaction of the control software: Limited or no function of the control software.
RLC 000639.12 (RLC 639.12)— Vehicle CAN Bus (500 kBd), High Error Rate
The CAN bus messages received cannot all be processed. This is possibly caused by a CAN bus overload or an internal control software error.
Reaction of the control software: Limited or no function of the control software.
RLC 000639.14 (RLC 639.14)— Vehicle CAN Bus (500 kBd), Very High Error Rate
Too many incorrect CAN bus messages are being received. This points to a general problem with the connection to the vehicle CAN bus (500 kBd).
Reaction of the control software: Limited or no function of the control software.
RLC 001231.12 (RLC 1231.12)— Implement CAN Bus, High Error Rate
The CAN bus messages received cannot all be processed. This is possibly caused by a CAN bus overload or an internal control software error.
Reaction of the control software: Limited or no function of the control software.
RLC 001231.14 (RLC 1231.14)— Implement CAN Bus, Very High Error Rate
Too many incorrect CAN bus messages are being received. This indicates a general problem at the connection to the Implement CAN Bus.
Reaction of the control software: Limited or no function of the control software.
RLC 001487.06 (RLC 1487.06)— Backlighting, Current Too High
This diagnostic trouble code is generated if the control software registers that the current at the output to the backlighting is too high. This indicates a short circuit to ground.
Reaction of the control software: Limited or no function of the backlighting.
RLC 002000.09 (RLC 2000.09)— Incorrect CAN Bus Message, Information from ECU Control Unit
This diagnostic trouble code is generated if a data transfer problem occurs between ECU control unit and RLC control software. Reception of one, several, or all of the CAN messages transmitted by the ECU is intermittent or non-existent (intermittent reception could be due to a loose wire). This indicates a problem in the CAN bus.
Reaction of the control software: Limited or no function of the control software.
RLC 002007.09 (RLC 2007.09)— Incorrect CAN Bus Message, Information from RPT Control Software
Data transfer problem between the RLC control software and RPT control software. This indicates a problem in the CAN bus or in the transmitting control software.
Reaction of the control software: Limited or no function of the control software.
RLC 002025.09 (RLC 2025.09)— Incorrect CAN Bus Message, Information from ATC/ ETC Control Software
This diagnostic trouble code is generated if a data transfer problem occurs between ATC / ETC control software and RLC control software. Reception of one, several or all of the CAN messages transmitted by the ATC / ETC control software is intermittent or non-existent (intermittent reception could be due to a loose wire). This indicates a problem in the CAN bus.
Reaction of the control software: Limited or no function of the control software.
RLC 002036.09 (RLC 2036.09)— Incorrect CAN Bus Message, Information from PTF Control Software
Data transfer problem between the RLC control software and PTF control software. This indicates a problem in the CAN bus or in the transmitting control software.
Reaction of the control software: Limited or no function of the control software.
RLC 002040.09 (RLC 2040.09)— Incorrect CAN Bus Message, Information from PDU Control Software
This diagnostic trouble code is generated if a data transfer problem occurs between control software PDU and control software RLC. Reception of one, several or all of the CAN messages transmitted by the PDU control software is intermittent or non-existent (intermittent reception could be due to a loose wire). This indicates a problem in the CAN bus.
Reaction of the control software: Limited or no function of the control software.
RLC 002049.09 (RLC 2049.09)— Incorrect CAN Bus Message, Information from OIC Control Software
This diagnostic trouble code is generated if a data transfer problem occurs between control software OIC and control software RLC. Reception of one, several or all of the CAN messages transmitted by the OIC control software is intermittent or non-existent (intermittent reception could be due to a loose wire). This indicates a problem in the CAN bus.
Reaction of the control software: Limited or no function of the control software.
RLC 002050.09 (RLC 2050.09)— Incorrect CAN Bus Message, Information from CLC Control Software
This diagnostic trouble code is generated if a data transfer problem occurs between control software CLC and control software RLC. Reception of one, several or all of the CAN messages transmitted by the CLC control software is intermittent or non-existent (intermittent reception could be due to a loose wire). This indicates a problem in the CAN bus.
Reaction of the control software: Limited or no function of the control software.
RLC 002055.06 (RLC 2055.06)— RLC Control Software, Current Too High
Total current at input (pin J4) too high. This indicates a short to ground in one of the control unit circuits. The RLC control software shuts down its functions one after the other.
Reaction of the control software: Limited or no function of the control software.
RLC 002071.09 (RLC 2071.09)— Incorrect CAN Bus Message, Information from CCU Control Software
This diagnostic trouble code is generated if a data transfer problem occurs between control software CCU and control software RLC. Reception of one, several or all of the CAN messages transmitted by the CCU control software is intermittent or non-existent (intermittent reception could be due to a loose wire). This indicates a problem in the CAN bus or in the transmitting control software.
Reaction of the control software: Limited or no function of the control software.
RLC 002139.09 (RLC 2139.09)— Incorrect CAN Bus Message, Information from CSM Control Software
This diagnostic trouble code is generated if a data transfer problem occurs between control software CSM and control software RLC. Reception of one, several or all of the CAN messages transmitted by the CSM control software is intermittent or non-existent (intermittent reception could be due to a loose wire). This indicates a problem in the CAN bus or in the transmitting control software.
Reaction of the control software: Limited or no function of the control software.
RLC 002145.09 (RLC 2145.09)— Incorrect CAN Bus Message, Information from FCC Control Software
This diagnostic trouble code is generated if a data transfer problem occurs between control software FCC and control software RLC. Reception of one, several or all of the CAN messages transmitted by the FCC control software is intermittent or non-existent (intermittent reception could be due to a loose wire). This indicates a problem in the CAN bus.
Reaction of the control software: Limited or no function of the control software.
RLC 002149.09 (RLC 2149.09)— Incorrect CAN Bus Message, Information from VLC Control Software
This diagnostic trouble code is generated if a data transfer problem occurs between control software VLC andcontrol software RLC. Reception of one, several or all of the CAN messages transmitted by the VLC control software is intermittent or non-existent (intermittent reception could be due to a loose wire). This indicates a problem in the CAN bus.
Reaction of the control software: Limited or no function of the control software.
RLC 002240.09 (RLC 2240.09)— Incorrect CAN Bus Message, Information from TEC Control Software
This diagnostic trouble code is generated if a data transfer problem occurs between control software TEC and control software RLC. Reception of one, several or all of the CAN messages transmitted by the TEC control software is intermittent or non-existent (intermittent reception could be due to a loose wire). This indicates a problem in the CAN bus or in the transmitting control software.
Reaction of the control software: Limited or no function of the control software.
RLC 002352.03 (RLC 2352.03)— Low Beam for Headlights on Cab Frame, Voltage Too High
This diagnostic trouble code is generated if a voltage higher than 16 volts is registered at the output to the headlights (low-beam) on the cab frame. This indicates a short circuit to a positive lead.
Reaction of the control software: Limited or no function of the low-beam headlights on the cab frame.
RLC 002352.05 (RLC 2352.05)— Low-Beam Headlights on Cab Frame, Current Too Low
This diagnostic trouble code is generated if the control software registers that the current at the output to the headlights (low-beam) on the cab frame is too low. This indicates that the circuit is open.
Reaction of the control software: Limited or no function of the low-beam headlights on the cab frame.
RLC 002352.06 (RLC 2352.06)— Low-Beam Headlights on Cab Frame, Current Too High
This diagnostic trouble code is generated if the control software registers that the current at the output to the headlights (low-beam) on the cab frame is too high. This indicates a short circuit to ground.
Reaction of the control software: Limited or no function of the low-beam headlights on the cab frame.
RLC 002358.03 (RLC 2358.03)— High-Beam Headlights on Cab Frame, Voltage Too High
Circuit open or shorted to 12 volts.
Reaction of the control software: Limited or no function of the high-beam headlights on the cab frame.
RLC 002358.05 (RLC 2358.05)— High-Beam Headlights on Cab Frame, Current Too Low
Circuit current too low. This indicates an open circuit.
Reaction of the control software: Limited or no function of the high-beam headlights on the cab frame.
RLC 002358.06 (RLC 2358.06)— High-Beam Headlights on Cab Frame, Current Too High
Circuit current too high. This indicates a short to ground.
Reaction of the control software: Limited or no function of the high-beam headlights on the cab frame.
RLC 002368.03 (RLC 2368.03)— Left Front Turn-Signal Light, Voltage Too High
This diagnostic trouble code is generated if a voltage higher than 16 volts is registered at the output to the left turn-signal light on the front. This indicates a short circuit to a positive lead.
Reaction of the control software: Limited or no function of the front left turn signal light.
RLC 002368.05 (RLC 2368.05)— Left Turn-Signal Light on Front, Current Too Low
This diagnostic trouble code is generated if the control software registers that the current at the output to the left turn-signal light on the front is too low. This indicates that the circuit is open.
Reaction of the control software: Limited or no function of the front left turn signal light.
RLC 002368.06 (RLC 2368.06)— Left Turn-Signal Light on Front, Current Too High
This diagnostic trouble code is generated if the control software registers that the current at the output to the left turn-signal light on the front is too high. This indicates a short circuit to ground.
Reaction of the control software: Limited or no function of the front left turn signal light.
RLC 002370.03 (RLC 2370.03)— Right Front Turn-Signal Light, Voltage Too High
This diagnostic trouble code is generated if a voltage higher than 16 volts is registered at the output to the right turn-signal light on the front. This indicates a short circuit to a positive lead.
Reaction of the control software: Limited or no function of the front right turn signal light.
RLC 002370.05 (RLC 2370.05)— Right Turn-Signal Light on Front, Current Too Low
This diagnostic trouble code is generated if the control software registers that the current at the output to the right turn-signal light on the front is too low. This indicates that the circuit is open.
Reaction of the control software: Limited or no function of the front right turn signal light.
RLC 002370.06 (RLC 2370.06)— Right Turn-Signal Light on Front, Current Too High
This diagnostic trouble code is generated if the control software registers that the current at the output to the right turn-signal light on the front is too high. This indicates a short circuit to ground.
Reaction of the control software: Limited or no function of the front right turn signal light.
RLC 002382.03 (RLC 2382.03)— Clearance Lights on Cab Frame, Voltage Too High
This diagnostic trouble code is generated if a voltage higher than 16 volts is registered at the output to the clearance lights on the cab frame. This indicates a short circuit to a positive lead.
Reaction of the control software: Limited or no function of the clearance lights on the cab frame.
RLC 002382.05 (RLC 2382.05)— Clearance Lights on Cab Frame, Current Too Low
This diagnostic trouble code is generated if the control software registers that the current at the output to the clearance lights on the cab frame is too low. This indicates that the circuit is open.
Reaction of the control software: Limited or no function of the clearance lights on the cab frame.
RLC 002382.06 (RLC 2382.06)— Clearance Lights on Cab Frame, Current Too High
This diagnostic trouble code is generated if the control software registers that the current at the output to the clearance lights on the cab frame is too high. This indicates a short circuit to ground.
Reaction of the control software: Limited or no function of the clearance lights on the cab frame.
RLC 002386.03 (RLC 2386.03)— Beacon Light, Voltage Too High
This diagnostic trouble code is generated if a voltage higher than 16 volts is registered at the output to the beacon light. This indicates a short circuit to a positive lead.
Reaction of the control software: Limited or no function of the beacon light.
RLC 002386.05 (RLC 2386.05)— Beacon Light, Current Too Low
This diagnostic trouble code is generated if the control software registers that the current at the output to the beacon light is too low. This indicates that there is an open circuit or that the configuration of address RLC 056 is wrong.
Reaction of the control software: Limited or no function of the beacon light.
RLC 002386.06 (RLC 2386.06)— Beacon Light, Current Too High
This diagnostic trouble code is generated if the control software registers that the current at the output to the beacon light is too high. This indicates a short circuit to ground.
Reaction of the control software: Limited or no function of the beacon light.
RLC 002390.03 (RLC 2390.03)— License Plate Light, Voltage Too High
This diagnostic trouble code is generated if a voltage higher than 16 volts is registered at the output to the license plate light. This indicates a short circuit to a positive lead.
Reaction of the control software: Limited or no function of the license plate light.
RLC 002390.05 (RLC 2390.05)— License Plate Light, Current Too Low
This diagnostic trouble code is generated if the control software registers that the current at the output to the license plate light is too low. This indicates that the circuit is open.
Reaction of the control software: Limited or no function of the license plate light.
RLC 002390.06 (RLC 2390.06)— License Plate Light, Current Too High
This diagnostic trouble code is generated if the control software registers that the current at the output to the license plate light is too high. This indicates a short circuit to ground.
Reaction of the control software: Limited or no function of the license plate light.
RLC 002865.02 (RLC 2865.02)— Rear Window Wiper Switch, Fault
This diagnostic trouble code is generated if the control software detects an incorrect signal from the switch for the rear wiper or reception is intermittent (intermittent reception could be due to a loose wire).
Reaction of the control software: Limited or no function of the rear windshield wiper.
RLC 003976.03 (RLC 3976.03)— Dome Light, Voltage Too High
This diagnostic trouble code is generated if a voltage higher than 16 volts is registered at the output to the dome light. This indicates a short circuit to a positive lead.
Reaction of the control software: Limited or no function of the dome light.
RLC 003976.05 (RLC 3976.05)— Dome Light, Current Too Low
This diagnostic trouble code is generated if the control software registers that the current at the output to the dome light is too low. This indicates that the circuit is open.
Reaction of the control software: Limited or no function of the dome light.
RLC 003976.06 (RLC 3976.06)— Dome Light, Current Too High
This diagnostic trouble code is generated if the control software registers that the current at the output to the dome light is too high. This indicates a short circuit to ground.
Reaction of the control software: Limited or no function of the dome light.
RLC 004058.02 (RLC 4058.02)— Dome Light Switch Fault
Switch position not plausible.
Reaction of the control software: Limited or no function of the dome light.
RLC 520273.03 — Console Light, Voltage Too High
This diagnostic trouble code is generated if a voltage higher than 16 volts is registered at the output to the console light. This indicates a short circuit to a positive lead.
Reaction of the control software: Limited or no function of the console light.
RLC 520273.05 — Console Light, Current Too Low
This diagnostic trouble code is generated if the control software registers that the current at the output to the console light is too low. This indicates that the circuit is open.
Reaction of the control software: Limited or no function of the console light.
RLC 520273.06 — Console Light, Current Too High
This diagnostic trouble code is generated if the control software registers that the current at the output to the console light is too high. This indicates a short circuit to ground.
Reaction of the control software: Limited or no function of the console light.
RLC 520425.07 — Received CAN Bus Messages, High Error Rate
Excessive error rate with received CAN bus messages.
Reaction of the control software: Limited or no function of the control software.
RLC 520426.07 — Transmitted CAN Bus Messages, High Error Rate
Error rate at transmitted CAN Bus messages too high.
Reaction of the control software: Limited or no function of the control software.
RLC 520542.03 — Vehicle CAN Bus (500 kBd), Voltage Too High
Voltage of CAN+ too high. This indicates a short to 12 V.
Reaction of the control software: Limited or no function of the control software.
RLC 520542.03 — Vehicle CAN Bus (500 kBd), Voltage Too High
Voltage of CAN+ too high. This indicates a short to 12 V.
Reaction of the control software: Limited or no function of the control software.
RLC 521393.06 — Rear Window Wiper (Home Position), Current Too High
Circuit current too high. This indicates a short to ground.
Reaction of the control software: Limited or no function of the wiper.
RLC 521535.03 — Left Worklight on Cab Frame, Voltage Too High
Circuit open or shorted to 12 volts.
Reaction of the control software: Limited or no function of the worklight.
RLC 521535.05 — Left Worklight on Cab Frame, Current Too Low
Circuit current too low. This indicates an open circuit.
Reaction of the control software: Limited or no function of the worklight.
RLC 521535.06 — Left Worklight on Cab Frame, Current Too High
Circuit current too high. This indicates a short to ground.
Reaction of the control software: Limited or no function of the worklight.
RLC 521536.03 — Left Worklight on Cab Frame or Left Xenon (HID) Worklight on Cab Frame, Voltage Too High
Circuit open or shorted to 12 volts.
Reaction of the control software: Limited or no function of the worklight.
RLC 521536.05 — Left Worklight on Cab Frame or Left Xenon (HID) Worklight on Cab Frame, Current Too Low
Circuit current too low. This indicates an open circuit.
Reaction of the control software: Limited or no function of the worklight.
RLC 521536.06 — Left Worklight on Cab Frame or Left Xenon (HID) Worklight on Cab Frame, Current Too High
Circuit current too high. This indicates a short to ground.
Reaction of the control software: Limited or no function of the worklight.
RLC 521537.03 — Left Outer Worklight on Front of Roof, Left Turn-Signal Light on Front of Roof (SAE) or Left Extra-Wide Vehicle Turn-Signal Light (SAE), Voltage Too High
Circuit open or shorted to 12 volts.
Reaction of the control software: Limited or no function of the worklight or the turn-signal light.
RLC 521537.05 — Left Outer Worklight on Front of Roof, Left Turn-Signal Light on Front of Roof (SAE) or Left Extra-Wide Vehicle Turn-Signal Light (SAE), Current Too Low
Circuit current too low. This indicates an open circuit.
Reaction of the control software: Limited or no function of the worklight or the turn-signal light.
RLC 521537.06 — Left Outer Worklight on Front of Roof, Left Turn-Signal Light on Front of Roof (SAE) or Left Extra-Wide Vehicle Turn-Signal Light (SAE), Current Too High
Circuit current too high. This indicates a short to ground.
Reaction of the control software: Limited or no function of the worklight or the turn-signal light.
RLC 521538.03 — Left Middle Worklight on Front of Roof or Left Xenon (HID) Worklight on Front of Roof, Voltage Too High
Circuit open or shorted to 12 volts.
Reaction of the control software: Limited or no function of the worklight.
RLC 521538.05 — Left Middle Worklight on Front of Roof or Left Xenon (HID) Worklight on Front of Roof, Current Too Low
Circuit current too low. This indicates an open circuit.
Reaction of the control software: Limited or no function of the worklight.
RLC 521538.06 — Left Middle Worklight on Front of Roof or Left Xenon (HID) Worklight on Front of Roof, Current Too High
Circuit current too high. This indicates a short to ground.
Reaction of the control software: Limited or no function of the worklight.
RLC 521539.03 — Left Inner Worklight on Front of Roof, Voltage Too High
Circuit open or shorted to 12 volts.
Reaction of the control software: Limited or no function of the worklight.
RLC 521539.05 — Left Inner Worklight on Front of Roof, Current Too Low
Circuit current too low. This indicates an open circuit.
Reaction of the control software: Limited or no function of the worklight.
RLC 521539.06 — Left Inner Worklight on Front of Roof, Current Too High
Circuit current too high. This indicates a short to ground.
Reaction of the control software: Limited or no function of the worklight.
RLC 521541.03 — Left Side-Facing Worklight on Rear of Roof, Voltage Too High
Circuit open or shorted to 12 volts.
Reaction of the control software: Limited or no function of the worklight.
RLC 521541.05 — Left Side-Facing Worklight on Rear of Roof, Current Too Low
Circuit current too low. This indicates an open circuit.
Reaction of the control software: Limited or no function of the worklight.
RLC 521541.06 — Left Side-Facing Worklight on Rear of Roof, Current Too High
Circuit current too high. This indicates a short to ground.
Reaction of the control software: Limited or no function of the worklight.
RLC 521542.03 — Left Outer Worklight on Rear of Roof or Left Turn-Signal Light on Rear of Roof (SAE), Voltage Too High
Circuit open or shorted to 12 volts.
Reaction of the control software: Limited or no function of the worklight or the turn-signal light.
RLC 521542.05 — Left Outer Worklight on Rear of Roof or Left Turn-Signal Light on Rear of Roof (SAE), Current Too Low
Circuit current too low. This indicates an open circuit.
Reaction of the control software: Limited or no function of the worklight or the turn-signal light.
RLC 521542.06 — Left Outer Worklight on Rear of Roof or Left Turn-Signal Light on Rear of Roof (SAE), Current Too High
Circuit current too high. This indicates a short to ground.
Reaction of the control software: Limited or no function of the worklight or the turn-signal light.
RLC 521544.03 — Left Inner Worklight on Rear of Roof or Left Xenon (HID) Worklight on Rear of Roof, Voltage Too High
Circuit open or shorted to 12 volts.
Reaction of the control software: Limited or no function of the worklight.
RLC 521544.05 — Left Inner Worklight on Rear of Roof or Left Xenon (HID) Worklight on Rear of Roof, Current Too Low
Circuit current too low. This indicates an open circuit.
Reaction of the control software: Limited or no function of the worklight.
RLC 521544.06 — Left Inner Worklight on Rear of Roof or Left Xenon (HID) Worklight on Rear of Roof, Current Too High
Circuit current too high. This indicates a short to ground.
Reaction of the control software: Limited or no function of the worklight.
RLC 521553.03 — Right Worklight on Cab Frame, Voltage Too High
Circuit open or shorted to 12 volts.
Reaction of the control software: Limited or no function of the worklight.
RLC 521553.05 — Right Worklight on Cab Frame, Current Too Low
Circuit current too low. This indicates an open circuit.
Reaction of the control software: Limited or no function of the worklight.
RLC 521553.06 — Right Worklight on Cab Frame, Current Too High
Circuit current too high. This indicates a short to ground.
Reaction of the control software: Limited or no function of the worklight.
RLC 521554.03 — Right Worklight on Cab Frame or Right Xenon (HID) Worklight on Cab Frame, Voltage Too High
Circuit open or shorted to 12 volts.
Reaction of the control software: Limited or no function of the worklight.
RLC 521554.05 — Right Worklight on Cab Frame or Right Xenon (HID) Worklight on Cab Frame, Current Too Low
Circuit current too low. This indicates an open circuit.
Reaction of the control software: Limited or no function of the worklight.
RLC 521554.06 — Right Worklight on Cab Frame or Right Xenon (HID) Worklight on Cab Frame, Current Too High
Circuit current too high. This indicates a short to ground.
Reaction of the control software: Limited or no function of the worklight.
RLC 521555.03 — Right Outer Worklight on Front of Roof, Right Turn-Signal Light on Front of Roof (SAE) or Right Extra-Wide Vehicle Turn-Signal Light (SAE), Voltage Too High
Circuit open or shorted to 12 volts.
Reaction of the control software: Limited or no function of the worklight or the turn-signal light.
RLC 521555.05 — Right Outer Worklight on Front of Roof, Right Turn-Signal Light on Front of Roof (SAE) or Right Extra-Wide Vehicle Turn-Signal Light (SAE), Current Too Low
Circuit current too low. This indicates an open circuit.
Reaction of the control software: Limited or no function of the worklight or the turn-signal light.
RLC 521555.06 — Right Outer Worklight on Front of Roof, Right Turn-Signal Light on Front of Roof (SAE) or Right Extra-Wide Vehicle Turn-Signal Light (SAE), Current Too High
Circuit current too high. This indicates a short to ground.
Reaction of the control software: Limited or no function of the worklight or the turn-signal light.
RLC 521556.03 — Right Middle Worklight on Front of Roof or Right Xenon (HID) Worklight on Front of Roof, Voltage Too High
Circuit open or shorted to 12 volts.
Reaction of the control software: Limited or no function of the worklight.
RLC 521556.05 — Right Middle Worklight on Front of Roof or Right Xenon (HID) Worklight on Front of Roof, Current Too Low
Circuit current too low. This indicates an open circuit.
Reaction of the control software: Limited or no function of the worklight.
RLC 521556.06 — Right Middle Worklight on Front of Roof or Right Xenon (HID) Worklight on Front of Roof, Current Too High
Circuit current too high. This indicates a short to ground.
Reaction of the control software: Limited or no function of the worklight.
RLC 521557.03 — Right Inner Worklight on Front of Roof, Voltage Too High
Circuit open or shorted to 12 volts.
Reaction of the control software: Limited or no function of the worklight.
RLC 521557.05 — Right Inner Worklight on Front of Roof, Current Too Low
Circuit current too low. This indicates an open circuit.
Reaction of the control software: Limited or no function of the worklight.
RLC 521557.06 — Right Inner Worklight on Front of Roof, Current Too High
Circuit current too high. This indicates a short to ground.
Reaction of the control software: Limited or no function of the worklight.
RLC 521559.03 — Right Side-Facing Worklight on Rear of Roof, Voltage Too High
Circuit open or shorted to 12 volts.
Reaction of the control software: Limited or no function of the worklight.
RLC 521559.05 — Right Side-Facing Worklight on Rear of Roof, Current Too Low
Circuit current too low. This indicates an open circuit.
Reaction of the control software: Limited or no function of the worklight.
RLC 521559.06 — Right Side-Facing Worklight on Rear of Roof, Current Too High
Circuit current too high. This indicates a short to ground.
Reaction of the control software: Limited or no function of the worklight.
RLC 521560.03 — Right Outer Worklight on Rear of Roof or Right Turn-Signal Light on Rear of Roof (SAE), Voltage Too High
Circuit open or shorted to 12 volts.
Reaction of the control software: Limited or no function of the worklight or the turn-signal light.
RLC 521560.05 — Right Outer Worklight on Rear of Roof or Right Turn-Signal Light on Rear of Roof (SAE), Current Too Low
Circuit current too low. This indicates an open circuit.
Reaction of the control software: Limited or no function of the worklight or the turn-signal light.
RLC 521560.06 — Right Outer Worklight on Rear of Roof or Right Turn-Signal Light on Rear of Roof (SAE), Current Too High
Circuit current too high. This indicates a short to ground.
Reaction of the control software: Limited or no function of the worklight or the turn-signal light.
RLC 521562.03 — Right Inner Worklight on Rear of Roof or Right Xenon (HID) Worklight on Rear of Roof, Voltage Too High
Circuit open or shorted to 12 volts.
Reaction of the control software: Limited or no function of the worklight.
RLC 521562.05 — Right Inner Worklight on Rear of Roof or Right Xenon (HID) Worklight on Rear of Roof, Current Too Low
Circuit current too low. This indicates an open circuit.
Reaction of the control software: Limited or no function of the worklight.
RLC 521562.06 — Right Inner Worklight on Rear of Roof or Right Xenon (HID) Worklight on Rear of Roof, Current Too High
Circuit current too high. This indicates a short to ground.
Reaction of the control software: Limited or no function of the worklight.
RLC 521567.06 — Turn-Signal Lights, Current Too High
Circuit current too high. This indicates a short to ground.
Reaction of the control software: Limited or no function of the turn-signal lights.
RLC 521835.20 — Control Software RLC, Ground Contact Fault
This diagnostic trouble code is generated if the control software detects a fault to ground. This indicates a problem in the ground circuit. The RLC control software shuts down its functions one after the other.
Reaction of the control software: Limited or no function of the control software.
RLC 522343.03 — Heated Rear Window, Voltage Too High
This diagnostic trouble code is generated if a voltage higher than 16 volts is registered at the output to the heated rear window. This indicates that the circuit is shorted to a supply lead.
Reaction of the control software: Limited or no function of the heated rear window.
RLC 522343.05 — Heated Rear Window, Current Too Low
This diagnostic trouble code is generated if the control software registers that the current at the output to the heated rear window is too low. This indicates that the circuit is open.
Reaction of the control software: Limited or no function of the heated rear window.
RLC 522343.06 — Heated Rear Window, Current Too High
Circuit current too high. This indicates a short to ground.
Reaction of the control software: Limited or no function of the heated rear window.
RLC 522433.03 — Rear Window Wiper, Voltage Too High
This diagnostic trouble code is generated if a voltage higher than 16 volts is registered at the output to the rear window wiper. This indicates that the circuit is shorted to a supply lead.
Reaction of the control software: Limited or no function of the rear windshield wiper.
RLC 522433.06 — Rear Window Wiper, Current Too High
This diagnostic trouble code is generated if the control software registers that the current at the output to the rear window wiper is too high. This indicates a short circuit to ground.
Reaction of the control software: Limited or no function of the rear windshield wiper.
RLC 522435.06 — Windshield Wiper (Fast), Current Too High
Circuit current too high. This indicates a short to ground.
Reaction of the control software: Limited function of the wiper.
RLC 524259.00 — Roof Control Unit, Temperature Too High
The diagnostic trouble code is generated if the control software detects that the temperature of the roof control unit is above 115°C (239°F).
Control software response: Limited or no functi on of the control software.
RLC 524259.15 — Roof Control Unit, Temperature Too High
The diagnostic trouble code is generated if the control software detects that the temperature of the roof control unit is above 85°C (185°F).
Control software response: Limited or no function of the control software.
RLC 524259.16 — Roof Control Unit, Temperature Too High
The diagnostic trouble code is generated if the control software detects that the temperature of the roof control unit is above 100°C (212°F).
Control software response: Limited or no function of the control software.