Park Lamps

The park lamps system includes the EMIC, the BCM and the headlamp switch on the instrument panel. The front park lamp and side marker lamp bulbs each have a path to ground at all times through their connection to the FEM wire harness. The FEM wire harness has takeouts with eyelet terminals that are secured by ground screws to the body sheet metal within the engine compartment. The rear park lamp, side marker lamp and license plate lamp bulbs have a path to ground at all times through a takeout and eyelet terminal of the body wire harness that is secured by a ground screw to the body sheet metal.

The EMIC monitors a hard wired multiplex input from the headlamp switch, then sends the appropriate electronic headlamp switch status  messages to the BCM over the CAN data bus. The BCM responds to these messages by providing a battery voltage output to the appropriate lamp bulbs through high side drivers on the front and rear, right and left park lamp feed circuits.

The BCM provides a battery saver (load shedding) feature for the park lamps, which will turn these lamps OFF if they are left ON for more than about eight minutes after the electronic ignition switch status  messages from the WIN indicate the ignition LOCK position is selected. The EMIC provides a fail-safe feature for the park lamps, which will send an electronic message to the BCM to turn these lamps ON automatically if it detects no input from the headlamp switch. The BCM also provides a fail-safe feature for the park lamps that will turn the headlamps and park lamps ON automatically whenever a loss of CAN bus communication is detected when the electronic ignition switch status  messages from the WIN indicate the ignition ON position is selected.