Exterior Lighting

The exterior lighting performs the following functions:
^ For the low beam operation, when the headlamp switch is enabled, the IPC connector C3 terminal D6 is grounded through the headlamp switch. In response to this input, the IPC sends a request via the class 2 serial data line to the PZM in order to activate the low beam headlamps. The PZM sends the appropriate commands in order to activate the low beams. Refer to "Headlamps Schematics" in Lighting and Horns..
^ For the high beam operation, when the multifunction lever is pulled inward, the headlamp dimmer switch closes. This action sends an input to the IPC connector C2 terminal B8. In response to this input, the IPC sends a request via the class 2 serial data line to the PZM in order to activate the high beam headlamps. The PZM performs the appropriate commands in order to activate the high beams. Refer to Headlamps Schematics in Lighting Systems. Electrical Diagrams
^ For the twilight sentinel, when the twilight sentinel is enabled, the IPC connector C3 terminal D8 is not grounded through the headlamp switch. When the ignition switch is in the RUN position, the twilight photocell indicates darkness, and the twilight switch is enabled, the IPC sends a request via the class 2 serial data line to the PZM in order to activate the low beam headlamps. The PZM sends the appropriate commands in order to activate the low beams.
^ For the twilight delay, the IPC monitors the twilight delay input at IPC connector C3 terminal D12. As the twilight delay switch is moved from MIN to MAX, the voltage at the terminal D12 increases. The IPC adjusts the twilight delay in 10 second intervals from 3-180 seconds in response to the voltage level at the twilight delay input. If the twilight sentinel switch is turned OFF during the delay period, the headlamps and the park lamps turn OFF immediately. The PZM sends the appropriate commands in order to deactivate the exterior beams. Refer to "Body Control Module Schematics" in Body Control Module.