Normal Operation
WARNING: This page is about a different car, the 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
The lighting control module (LCM) sends a voltage reference signal to the light sensor through circuit 218 (WH/VT). When a request for the autolamps is detected by the LCM, the LCM monitors the state of circuit 218 (WH/VT). When a low ambient light condition is present, the signal circuit is high, and the LCM supplies voltage to the exterior lamps. When a high ambient light condition is present, the light sensor pulls the voltage signal low, and the LCM deactivates the voltage to the exterior lamps. The light sensor is provided ground through circuit 676 (PK/OG).
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Light sensor
- LCM