Front Fog And Cornering 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.

Vehicles equipped with optional front fog lamps include a front fog lamp switch integral to the headlamp switch on the instrument panel. The front fog lamps have a path to ground at all times through their connection to the Front End Module (FEM) wire harness and a takeout with an eyelet terminal that is secured to the body sheet metal.

When the BCM input from the headlamp switch assembly indicates the fog lamps are selected, it controls front fog lamp operation by providing a battery voltage output to the fog lamps through the right and left front fog lamp control circuits. The BCM also sends the appropriate electronic front fog lamp status messages to the IPC to illuminate or extinguish the front fog lamp indicator.

Fog Lamp Dropout with High Beam Activation - If the front fog lamps are active and the vehicle's high beams turn ON, then the front fog lamp outputs shall turn OFF and the IPC indicator will also turn off and remain off until the high beams are turned OFF. If vehicle high beams are active and the front fog lamp command is operated, the IPC indicator will remain OFF. The BCM will keep track of a fog lamp request and honor the request when the high beams are turned OFF.

The BCM also provides a battery saver (load shedding) feature for the front fog lamps, which will turn these lamps OFF if they are left ON for more than about eight minutes when the status of the ignition switch is LOCK, if there is a charging system failure or if the electrical system voltage falls below about 11.75 volts for more than about 30 seconds.

Each front fog lamp includes an integral adjustment screw to be used for static aiming of the fog lamp beams.

FRONT FOG CORNERING LAMPS

The cornering lights function is derived from two different inputs. Steering angle or the activation of the turn signal lamps. Both of those items can induce lamp cornering activation. In the event that both are creating an active request at the same time, the steering angle will be given priority to the expense of the one based on the turn signal lights. In the case of the steering angle sensor, the lamps will activate at the "10 and 2" positions when turning. When neither angle is breached, both of the front fog lamps remain on uninterrupted.