STML and STMR: Left headlight driver module and right headlight driver module

The headlight driver module is fitted as a printed circuit board in the LED headlight. The headlight driver module analyses the signals transmitted by the footwell module (FRM) or the Body Domain Controller (BDC). In this process, the headlight driver module assumes control of the following lighting functions of the LED headlight:

• Side lights
• Daytime driving lights
• Side marker light
• Turn indicator
• Positioning light

Besides the lighting functions, the headlight driver module also controls the stepper motors for headlight beam throw adjustment and for the adaptive headlight. The footwell module (FRM) or the Body Domain Controller (BDC) issues the request as a message to the LIN bus.

The following graphic shows the right headlight driver module (STMR) using the example F10.

Fig 1: Identifying STML And STMR

Courtesy of BMW OF NORTH AMERICA, INC.