Trailer Module (TRM)

NOTE: If a control module or component is suspect and the vehicle remains under manufacturer warranty, refer to the Warranty Policy and Procedures manual (section B1.2), or determine if any prior approval program is in operation, before the replacement of a component.

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

NOTE: When performing voltage or resistance tests, always use a digital multimeter (DMM) accurate to three decimal places, and with an up-to-date calibration certificate. When testing resistance always take the resistance of the DMM leads into account.

NOTE: Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.

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

NOTE: If DTCs are recorded and, after performing the pinpoint tests, a fault is not present, an intermittent concern may be the cause. Always check for loose connections and corroded terminals.

Description And Operation

For a detailed description of the trailer module system, refer to the relevant Description and Operation . Refer to Exterior Lighting .

TRAILER MODULE (TRM)

DTC	Description	Possible Cause	Action
C111A-11	Right Stop Lamp General Electrical Failures Circuit short to ground	Right stop lamp circuit - short to ground	Refer to electrical circuit diagrams and check right stop lamp circuit for short to ground
C111A-12	Right Stop Lamp General Electrical Failures Circuit short to battery	Right stop lamp circuit - short to power	Refer to electrical circuit diagrams and check right stop lamp circuit for short to power
C111B-11	Left Stop Lamp General Electrical Failures Circuit short to ground	Left stop lamp circuit - short to ground	Refer to electrical circuit diagrams and check left stop lamp circuit for short to ground
C111B-12	Left Stop Lamp General Electrical Failures Circuit short to battery	Left stop lamp circuit - short to power	Refer to electrical circuit diagrams and check left stop lamp circuit for short to power
C1120-11	Reversing lamp General Electrical Failures Circuit short to ground	Reverse lamp circuit - short to ground	Refer to electrical circuit diagrams and check reverse lamp circuit for short to ground
C1120-12	Reversing lamp General Electrical Failures Circuit short to battery	Reverse lamp circuit - short to power	Refer to electrical circuit diagrams and check reverse lamp circuit for short to power
C1126-11	Position Lamps General Electrical Failures Circuit short to ground	Position lamp circuit - short to ground	Refer to electrical circuit diagrams and check position lamp circuit for short to ground
C1126-12	Position Lamps General Electrical Failures Circuit short to battery	Position lamp circuit - short to power	Refer to electrical circuit diagrams and check position lamp circuit for short to power
B1102-62	Trailer stop lamp Algorithm Based Failures Signal compare failure	Input signal stop lamp from wire is inconsistent with CAN message	Check CJB for additional related DTCs and refer to relevant DTC Index. Carry out CAN network integrity tests using the manufacturer approved diagnostic system
B1A79-11	Rear Fog Lamp Circuit General Electrical Failures Circuit short to ground	Rear fog lamp circuit - short to ground	Refer to electrical circuit diagrams and check rear fog lamp circuit for short to ground
B1A79-12	Rear Fog Lamp Circuit General Electrical Failures Circuit short to battery	Rear fog lamp circuit - short to power	Refer to electrical circuit diagrams and check rear fog lamp circuit for short to power
B1D06-11	Left Turn Indicator General Electrical Failures Circuit short to ground	Left turn indicator lamp circuit - short to ground	Refer to electrical circuit diagrams and check left turn indicator lamp circuit for short to ground
B1D06-12	Left Turn Indicator General Electrical Failures Circuit short to battery	Left turn indicator lamp circuit - short to power	Refer to electrical circuit diagrams and check left turn indicator lamp circuit for short to power
B1D07-11	Right Turn Indicator General Electrical Failures Circuit short to ground	Right turn indicator lamp circuit - short to ground	Refer to electrical circuit diagrams and check right turn indicator lamp circuit for short to ground
B1D07-12	Right Turn Indicator General Electrical Failures Circuit short to battery	Right turn indicator lamp circuit - short to power	Refer to electrical circuit diagrams and check right turn indicator lamp circuit for short to power
U0010-88	Medium Speed CAN Communication Bus Signal / Message Failures Bus off	Bus Off	Carry out CAN network integrity tests using the manufacturer approved diagnostic system
U0140-87	Lost Communication With Central electronic module Bus Signal / Message Failures Missing message	Missing message	Check CJB for DTCs and refer to the relevant DTC Index.
U0300-00	Internal Control Module Software Incompatibility General Failure Information No sub type information	Invalid configuration message is received	Re-configure the CJB using the manufacturer approved diagnostic system. Clear the DTC and retest. If the DTC is still logged suspect the trailer module, refer to the new module installation note at the top of the DTC Index
U0422-68	Invalid Data Received From Central electronic module Algorithm Based Failures	Event information	Check for additional related DTCs and refer to the relevant DTC Index
U1A03-81	Car Config Parameter Bus Signal / Message Failures	Invalid serial data received	Check/amend Car Configuration File (CCF) as required using the manufacturer approved diagnostic system. Carry out CAN network integrity tests using the manufacturer approved diagnostic system
U2100-51	Control Module Not Configured System Programming Failures	Not programmed	Install latest available level of software using the manufacturer approved diagnostic system. Check/amend Car Configuration File (CCF) as required using the manufacturer approved diagnostic system
U3000-42	Control Module System Internal Failures General memory failure	RAM or EEPROM memory test failed	Install a new module, refer to the new module/component installation note at the top of the DTC Index
U3000-51	Control Module System Programming Failures	Not programmed	Install latest available level of software using the manufacturer approved diagnostic system. Check/amend Car Configuration File (CCF) as required using the manufacturer approved diagnostic system
U3003-62	Battery Voltage Algorithm Based Failures Signal compare failure	Difference in battery voltage, of 2 volts more, between trailer module and CJB	Carry out pinpoint tests associated with this DTC using the manufacturer approved diagnostic system