Tail Lamp: Description and Operation

The park lamps will illuminate when the headlamp switch is placed in the PARK or ON position. If the headlamp switch is left in the PARK or ON position, the park lamps will be deactivated after 10 minutes following an ignition switch transition to the OFF position, because of the battery rundown protection feature. The park lamps will also illuminate if the fog lamps are activated. When the park lamps are on the LIGHTS ON indicator illuminates. The side marker lamps illuminate whenever the park lamps are on. The side marker lamps contain reflectors for increased nighttime driving safety. The left underhood fuse block provides battery positive voltage to the PARK LAMPS Relay switch through the BODY 1 fuse. When the headlamp switch is in the PARKLAMP or HEADLAMP position, or the front fog lamps switch is enabled, the IPC park lamps input is grounded through the headlamp switch to G205. In response to this input, the instrument cluster sends a class 2 message to the BCM in order to activate the park lamps. The BCM provides battery positive voltage to the Park Lamps Relay coil. The Park Lamps Relay coil receives ground through the headlamp switch to G205. The Park Lamps Relay coil is then energized, closing the switch contacts. Battery positive voltage is then applied through the park lamps to the LT PARK Fuse and the RT PARK Fuse to the left and right park lamps.

When the twilight sentinel is activated and the ambient light sensor indicates darkness, the BCM applies battery positive voltage to the PARK LAMPS Relay coil. The BCM also provides ground for the PARK LAMPS Relay coil. The park lamps are then activated as previously described when activated from the headlamp switch.