Trailer Module (TRM) fault code (Freelander 2)

Trailer block

NOTE: If a module or component failure is suspected and the vehicle remains under manufacturer's warranty, refer to the Warranty Guide (Section B1.2) or determine if there is a previously approved special program in effect before replacing the component.

NOTE: Generic scan tools may not be able to read the codes listed or may only be able to read 5-digit codes. Match the 5 digits from the scan tool with the first 5 digits of the listed 7-digit code to identify the fault (the last 2 digits provide additional information readable by the manufacturer-approved diagnostic system).

NOTE: When performing voltage or resistance tests, always use a digital multimeter (DMM) with three decimal places of accuracy and a valid calibration certificate. When testing resistance, be sure to include the resistance of the DMM leads.

NOTE: Before starting diagnostic programs using fault location tests, check and correct basic faults.

NOTE: Inspect the connectors for signs of water ingress and their pins for damage and/or corrosion.

NOTE: If DTCs are set and the fault is not present after performing the troubleshooting tests, an intermittent problem may be the cause. Be sure to check for loose connections and corroded terminals.

Description and operation

For a detailed description of the trailer unit system, see the relevant section "Description and Operation" of the workshop manual. For additional information, refer to the chapter: Exterior Lighting (417-01 Exterior Lighting, Description and Operation).

DTC	Description	Possible reason	Action
C111A-11	Right brake light - general electrical fault: short circuit to ground	Right brake light circuit: short circuit to ground	Using the electrical diagrams, check the right brake light circuit for a short to ground
C111A-12	Right brake light - general electrical fault: short circuit to battery	Right brake light circuit: short circuit to power	Using the electrical diagrams, check the right brake light circuit for a short to power
C111B-11	Left brake light - general electrical fault: short circuit to ground	Left brake light circuit: short to ground	Using the electrical diagrams, check the left brake light circuit for a short to ground
C111B-12	Left brake light - general electrical fault: short circuit to battery	Left brake light circuit: short circuit to power supply	Using the electrical diagrams, check the left brake light circuit for a short to power
C1120-11	Reversing light - general electrical fault: short circuit to ground	Reversing Light Circuit: Short to Ground	Using the electrical diagrams, check the reverse light circuit for a short to ground
C1120-12	Reversing light - general electrical fault: short circuit to battery	Reversing Light Circuit: Short to Power	Using the electrical diagrams, check the reverse light circuit for a short to power
C1126-11	Side lights - general electrical fault: short circuit to ground	Parking Light Circuit: Short to Ground	Using the electrical diagrams, check the parking light circuit for a short to ground
C1126-12	Side lights - general electrical fault: short circuit to battery	Parking light circuit: short circuit to power supply	Using the electrical diagrams, check the parking light circuit for a short to power
B1102-62	Trailer brake light - algorithm failures: signal matching error	Brake light input signal (wired) is different from CAN message	Check for additional associated DTCs for the CJB and refer to the appropriate DTC index. Perform CAN network integrity tests using the manufacturer approved diagnostic system.
B1A79-11	Rear fog lamp circuit - general electrical fault: short circuit to ground	Rear fog lamp circuit short to ground	Using the electrical diagrams, check the rear fog lamp circuit for a short to ground
B1A79-12	Electrical circuit of the rear fog lamp - general electrical fault: short circuit to the battery	Rear fog lamp circuit: short circuit to power	Using the electrical diagrams, check the rear fog lamp circuit for a short to power
B1D06-11	Left Turn Signal Circuit - General Electrical Fault: Short to Ground	Left turn signal circuit: short to ground	Using the electrical diagrams, check the left turn signal circuit for a short to ground
B1D06-12	Left turn signal circuit - general electrical fault: short circuit to battery	Left turn signal circuit: short circuit to power	Using the electrical diagrams, check the left turn signal circuit for a short to power
B1D07-11	Right turn signal circuit - general electrical fault: short circuit to ground	Right turn signal circuit: short to ground	Using the electrical diagrams, check the right turn signal circuit for a short to ground
B1D07-12	Right turn signal circuit - general electrical fault: short circuit to battery	Right turn signal circuit: short circuit to power	Using the electrical diagrams, check the right turn signal circuit for a short to power
U0010-88	Medium Speed CAN Bus: Signal/Message Failure, Bus Shutdown	Bus shutdown	Perform CAN network integrity tests using the manufacturer approved diagnostic system.
U0140-87	No communication with the central electronic unit - signal/message transmission failure on the bus: no message	Missing message	Check for DTCs for the CJB and refer to the appropriate DTC index.
U0300-00	General fault information - Internal control unit software incompatibility: no subtype information	Invalid configuration message received	Configure the central junction box using the manufacturer approved diagnostic system. Clear the DTCs and retest. If this DTC still logs, the trailer module may be the cause, see the note on installing a new module at the beginning of the DTC index
U0422-68	Incorrect data received from the central electronic unit: algorithm failures	Event Information	Check for additional related DTCs and refer to the appropriate DTC index
U1A03-81	Vehicle Configuration Parameters: Bus Signal/Message Failure	Invalid serial data received	Check/correct the vehicle configuration file (CCF) using the manufacturer approved diagnostic system. Perform CAN network integrity tests using the manufacturer approved diagnostic system.
U2100-51	Control unit not configured: system programming errors	Not programmed	Install the latest available software version using the manufacturer approved diagnostic system. Check/correct the vehicle configuration file (CCF) using the manufacturer approved diagnostic system.
U3000-42	Control unit - internal system faults: general memory fault	Negative RAM or EEPROM test result	Install a new module, see the new module/component installation note at the beginning of the DTC index
U3000-51	Control unit: system programming errors	Not programmed	Install the latest available software version using the manufacturer approved diagnostic system. Check/correct the vehicle configuration file (CCF) using the manufacturer approved diagnostic system.
U3003-62	Battery Voltage - Algorithm Error: Signal Matching Error	Battery voltage discrepancy of 2V or more between trailer module and central junction box	Perform the troubleshooting tests associated with this DTC using the manufacturer approved diagnostic system

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