Diagnosis instructions for the trailer module
The trailer module (AHM) detects and reacts to the following faults:
- Checksum error of the various memories and watchdog reset
- Faults of the CAN drivers
- Line faults of the CAN interface and of the brake light input
- Line fault of all outputs with short circuit and wire break
- Undervoltage or overvoltage and implausibility of the voltage at the trailer module (AHM) compared to the vehicle voltage
- Implausibility of a CAN message "Braking" compared to the hard-wired brake light input at the control unit
- Implausibility of the sense values of the lighting outputs of the control unit
- Faults at the lamp outputs of the trailer module (AHM) are output as Check Control messages