Diagnosis & Testing: Headlamps: Headlamps

The headlamps are controlled by the FEM and the instrument cluster. The headlamp multifunction switch is hardwired to the instrument cluster. When the headlamp switch is in any position, the instrument cluster will send a command to the FEM via the SCP communication network. The FEM will process this information and output the appropriate command to the headlamps, which are hardwired to the FEM. This is the same for the low and high beams and flash-to-pass positions. Daytime Running Lamps (DRL) is an additional feature which the FEM may be configured to include. Left and right low, as well as high beams, will provide a lamp outage indication. Fault management of the headlamps will provide some headlamp functionality. In the event of all multifunction switch, all headlamp switch or ignition switch invalid or missing data failures, the low beams will be illuminated. There is also a headlamp battery saver feature. This feature turns off the headlamps in 10 minutes after the ignition is turned off.