Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information TRM-U1A4B8F

Condition
The trailer module (TRM) transmits and receives information via a standardised serial communication method - CAN (Controller Area Network).
The diagnostic trouble code (DTC) is stored if the control module detects that:
- The signal is incorrect.
The control module's test for the diagnostic trouble code (DTC) starts in the event of:
- Control module supplied with power.

Note! The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.





Substitute value
- None.

Possible source
- The trailer module (TRM) has no contact with processor B.

Fault symptom[s]
- JV, Trailer lighting/Does not work