LHML and LHMR: LED main light module on the left and LED main headlight module on the right

At the request of the footwell module (FRM) or the Body Domain Controller (BDC), the LED main light module activates the following lighting functions for example:

• Low-beam headlights
• Cornering light
• High-beam headlight
• Headlight flasher

The LED main light module also regulates the temperature control in the LED headlight. The values of several temperature sensors in the LED headlight, as well as the signals relating to driving speed and ambient temperature messages communicated via the bus serve as input signals.

The fans are controlled depending on requirements. After the lighting functions and terminal 15 are switched off an after-run of the fans until rest state of the LED main light module is possible to prevent the LED headlight from thawing.

In the event of a temperature sensor malfunction, the fans are switched on at full blast to protect the components in the LED headlight.

The following graphic shows the LED main headlight module on the right (LHMR) using the example F10.

Fig 1: Identifying LHML And LHMR

Courtesy of BMW OF NORTH AMERICA, INC.