Trailer block
NOTE: If a unit or component is likely to fail and the vehicle is still under manufacturer's warranty, refer to the warranty manual before replacing the component (section B1.2) or determine if there is any previously approved special program in operation.
NOTE: Universal Scan Tools may not read the listed codes or may only read 5-digit codes. Match the 5 digits from the scan tool with the first 5 digits of the 7-digit code listed to identify the problem (the last 2 digits give additional information read by the diagnostic system approved by the manufacturer).
NOTE: Always use a digital multimeter when performing voltage or resistance tests (DMM) accurate to three decimal places and with a valid calibration certificate. When testing resistance, be sure to consider the resistance of the DMM leads.
NOTE: Before starting diagnostic programs using troubleshooting tests, check and correct major problems.
NOTE: Inspect the connectors for signs of water intrusion and their pins for damage and (or) traces of corrosion.
NOTE: If DTCs are logged and there is no problem after performing troubleshooting tests, an intermittent problem may be the cause. Be sure to check for loose connections and corroded contacts.
Description and operation
For a detailed description of the trailer block system, see the relevant section «Description and operation» repair manuals. For more information, see the chapter: Outdoor Lighting (417-01 Outdoor lighting, Description and principle of operation).
DTC | Description | Possible reason | Action |
C111A-11 | Right brake light - general electrical fault: short to ground | Right brake light circuit short to ground | Refer to electrical circuit diagrams and check right brake light circuit for short to ground |
C111A-12 | Right brake light - general electrical fault: short circuit to battery | Right brake light circuit short to power | Refer to electrical circuit diagrams and check right brake light circuit for short to power |
C111B-11 | Left brake light - general electrical fault: short to ground | Left brake light circuit short to ground | Refer to electrical circuit diagrams and check left brake light circuit for short to ground |
C111B-12 | Left brake light - general electrical fault: short circuit to battery | Left brake light circuit short to power | Refer to electrical circuit diagrams and check left brake light circuit for short to power |
C1120-11 | Reversing light - general electrical fault - short to ground | Reversing light circuit short to ground | Refer to electrical circuit diagrams and check reversing light circuit for short to ground |
C1120-12 | Reversing light - general electrical fault - short circuit to battery | Reversing light circuit short to power | Refer to electrical circuit diagrams and check reversing light circuit for short to power |
C1126-11 | Marker lights - general electrical fault: short to ground | Marker lamp circuit - short circuit to ground | Refer to electrical circuit diagrams and check parking light circuit for short to ground |
C1126-12 | Marker lights - general electrical fault: short circuit to battery | Marker light circuit - short circuit to power | Refer to electrical circuit diagrams and check parking light circuit for short to power |
B1102-62 | Trailer Stop Light - Algorithm Failures: Signal Mapping Error | Brake light input (wired) different from CAN·message | Check for additional related CJB DTCs and refer to the appropriate DTC index. Perform CAN network integrity checks using the manufacturer's approved diagnostic system. |
B1A79-11 | Rear fog light circuit - general electrical fault - short to ground | Rear fog light circuit short to ground | Refer to electrical circuit diagrams and check rear fog light circuit for short to ground |
B1A79-12 | Rear fog light circuit - general electrical fault - short circuit to battery | Rear fog light circuit short to power | Refer to electrical circuit diagrams and check rear fog light circuit for short to power |
B1D06-11 | Left turn signal circuit - general electrical fault - short to ground | Left turn signal circuit - short to ground | Refer to electrical circuit diagrams and check left turn signal circuit for short to ground |
B1D06-12 | Left turn signal circuit - general electrical fault - short to battery | Left turn signal circuit - short circuit to power | Refer to electrical circuit diagrams and check left turn signal circuit for short to power |
B1D07-11 | Right turn signal circuit - general electrical fault - short to ground | Right turn signal circuit - short to ground | Refer to electrical circuit diagrams and check right turn signal circuit for short to ground |
B1D07-12 | Right turn signal circuit - general electrical fault - short to battery | Right turn signal circuit - short to power | Refer to electrical circuit diagrams and check right turn signal circuit for short to power |
U0010-88 | Medium speed CAN bus: signal/message failure, bus shutdown | Bus shutdown | Perform CAN network integrity checks using the manufacturer's approved diagnostic system. |
U0140-87 | No communication with the central electronic unit - bus signal/message failure: no message | Missing message | Check for CJB DTCs and refer to the appropriate DTC index. |
U0300-00 | General information about the fault - incompatibility of the software of the internal control unit: no information on the subtype | Invalid configuration message received | Configure the central junction box using the manufacturer's approved diagnostic system. Clear the DTCs and recheck. If this DTC is still set, the trailer module may be the cause, see the new module installation note 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 relevant DTC index |
U1A03-81 | Vehicle Configuration Parameters: Bus Signal/Communication Failure | Invalid serial data received | Check/Correct Vehicle Configuration File (CCF), using the manufacturer approved diagnostic system. Perform CAN network integrity checks using the manufacturer's approved diagnostic system. |
U2100-51 | Control unit not configured: system programming errors | not programmed | Install the latest available software using the manufacturer approved diagnostic system. Check/Correct 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 using the manufacturer approved diagnostic system. Check/Correct Vehicle Configuration File (CCF), using the manufacturer approved diagnostic system. |
U3003-62 | Battery Voltage - Algorithm Failures: Signal Mapping Error | Battery voltage mismatch 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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