Structure and inner electrical connection

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The two headlight driver modules are of the same design, but are divided by means of pin coding into a left headlight driver module (STML) and a right headlight driver module (STMR). In the event of a replacement, the corresponding headlight driver module must be encoded.

The headlight driver module (STML or STMR) is a bus user on the K-CAN3. Furthermore, the headlight driver module is connected via a LIN bus to the footwell module (FRM).

The rear power distribution box supplies the two headlight driver modules (STML and STMR) with terminal 30F.

Fig 1: STML - Circuit Diagram

Courtesy of BMW OF NORTH AMERICA, INC.

Item	Explanation
1	Left headlight driver module (STML) or right headlight driver module (STMR)

Pin assignments

The graphic above shows only the supply and bus connection. The current pin assignment is recorded on the wiring diagrams in the ISTA diagnosis system (Integrated Service Technical Application). Click on the component code in the wiring diagram to activate the "Installation location" and "Pin assignment" tabs.