Park Lamps

WARNING: This page is about a different car, the 2017 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

The park lamps system includes the headlamp switch on the instrument panel and the BCM. The front park lamps 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 to the body sheet metal. The rear park/tail lamps and license plate lamp bulb each have a path to ground at all times through a takeout and eyelet terminal of the body wire harness that is also secured to the body sheet metal.

The BCM monitors a hard wired multiplex input from the headlamp switch. The BCM responds to this input by controlling a battery voltage output to the appropriate lamps and bulbs through high side drivers on the front and rear, right and left lamp driver and control circuits. The BCM also sends the appropriate electronic park lamps status messages to the IC to control the illumination and lighting level of the panel lamps.

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 while the ignition switch status is LOCK. The BCM also provides a fail-safe feature for the park lamps, which will turn the park lamps and low beam headlamps ON automatically if there is no input available from the headlamp switch after the ignition switch status transitions to ON. The BCM also provides a fail-safe feature for the park lamps that will turn the park lamps and low beam headlamps ON automatically whenever a loss of CAN bus communication is detected after the ignition switch status transitions to ON.