Light Check Module (LCM)

Light Check Module (LCM) (E38 and E39 from 9/95to 9/98)
The Light Check Module (LCM) combines the functions of the Check Control and Light Modules previously installed in the 1995 E38. The LCM provides a cost savings by combining the two functions into one processor.




It is installed in the right kick panel where the LM of the 95 E38 was installed. Both versions of instrument clusters use the LCM for processing Check Control data and controlling the exterior lighting functions of the vehicle. The LCM communicates with other modules over the "I" and "K" busses. Functions of the LCM include:
- Monitoring of all check control inputs
- Formation and output of check control messages or signals
- Control of all vehicle external lighting
- Monitoring of all external lighting for operation
- Instrument panel illumination dimming (KL 58g) signal
- Control of instrument cluster indicator lights - for high beam, turn signal and fog light indicators.




For proper operation of the Check Control and lamp control functions, the LCM must be coded with the Central Coding Key (ZCS) if replacement is required.