Light module (LM) 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
No permanent high beam, emergency function while lever remains pressed	Steering_column_lever_operation	SZL
Turn signal is not automatically canceled	Steering wheel angle	SZL
Turn signal is not automatically canceled	Steering_wheel_angle_fault	SZL
Restricted monitoring of reversing lights	Trailer_status	AHM
Flashing frequency not doubled	Trailer_indicator _fault_status	AHM
Lights permanently on	Headlamp_status	AIC
No reversing lights	Transmission_gear_status	EGS
No headlamp flasher, brake lights, turn signals at Terminal R	Terminal_R_status	CAS
Position light remains on	Key_in_ignition_status	CAS
No brake lights via ACC	Brake_light_control	DSC
No stop position for turn signals, emergency function while lever remains pressed	Steering_column_lever_operation	SZL
No hazard warning lights with antitheft alarm	Antitheft_alarm_control	DWA
No alarm acknowledgment active	Alarm_acknowledgment_control	DWA

Abbreviations	Full expression
ACC	Active Cruise Control
AHM	Trailer Module
AIC	Rain sensor
CAS	Car Access System
DWA	Antitheft alarm system
DSC	Dynamic Stability Control
EGS	Electronic transmission control
SZL	Steering column switch center