Trailer module (AHM) fault patterns

Impact of bus faults

If individual bus signals fail that are not stored in the fault memory

- First, perform troubleshooting on the corresponding transmitter control module.
- If the transmitter control module is OK, troubleshooting must be run on the receiver control module.

Possible fault symptom or perception on failure of the corresponding bus signal	Faulty or missing signal	Transmitter control module
Turn signal failure	Turn_signal_status	LM
No flasher timing signal	Flasher_timing_signal	LM
Rear fog light failure	Rear_fog_light_status	LM
Left parking light failure	Left_parking_light_status	LM
Right parking light failure	Right_parking_light_status	LM
Reversing light failure	Reversing_light_status	LM

Abbreviations	Full expression
LM	LM