Light Check Module III (LCM III): Notes

The LCM III continues to be installed in the right kick panel. The LCM communicates with other modules over the "I" and "K" busses. The module itself has been redesigned with new semi-conductor final stages that produce less heat in operation. This has allowed for the elimination of the protruding heat sink found on the previous LCM.

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.
  Fig 1: Identifying Functions Of LCM

  Courtesy of BMW OF NORTH AMERICA, INC.
  Fig 2: Identifying Light Check Module III (LCM III) Diagram

  Courtesy of BMW OF NORTH AMERICA, INC.

For Proper Operation of the check control and lamp control functions, the LCM must be coded with the Central Key (ZCS) if replacement is required.