Twilight Sentinel

he Twilight Sentinel performs two major functions. It determines automatic turn on/off control of the exterior lamps. It also holds the exterior lamps on for a period of time after the ignition switch is removed from RUN.

When the Twilight Sentinel Switch is enabled, terminal D8 of Instrument Panel Cluster (IPC) connector C3 is grounded through the Headlamp Switch. When the Ignition Switch is in RUN, the Transaxle is in PARK, the Twilight Photocell indicates darkness, and the Twilight Sentinel Switch is enabled the IPC sends a request via the Class 2 serial data line to the PZM to activate the Low Beam Headlamps. The PZM then applies battery voltage to the coil of Headlamp Relay "A." The PZM also provides ground for the coil. The low beam headlamps are then activated as previously described when activated from the Headlamp Switch. The park lamps are also turned on.

If the exterior lamps are on from an automatic turn on by the Twilight Sentinel, the Twilight Sentinel will keep the Headlamps and Park Lamps on for a driver defined delay period when the ignition switch is turned off. Activation of the Headlamp Switch will override all Twilight Sentinel operations.