When the front fog lamp switch is pressed, the instrument panel integration module (IPM) Front Fog Lamp Switch Input is grounded. In response to this input, the IPM sends a Class 2 message to the dash integration module (DIM) changing the state of the front fog lamps. The state of the front fog lamps will remain the same until the front fog lamp switch is pressed, even between ignition cycles. Battery positive voltage (B+) is supplied at all times from the underhood fuse block FOG/DRL Fuse to the FOG LP relay switch. Battery positive voltage (B+) is supplied with the ignition switch in the ON or START position to the FOG LP relay coil. The FOG LP relay is located in the underhood fuse block. When the front fog lamp state is on, the DIM grounds the FOG LP relay coil. With the ignition switch in the ON or START position, the FOG LP relay coil is energized and the switch contact closes. Battery positive voltage (B+) is supplied to the LH and RH front fog lamps. The LH and RH front fog lamps are both permanently grounded, so both front fog lamps have power and ground, and then light. When the front fog lamps are on, the park lamps will also light.

The front fog lamps indicator may only be ON during RUN. The IPC illuminates the front fog lamps indicator when the dash integration module (DIM) sends a class 2 serial data message indicating that the front fog lamps are ON.

When the rear fog lamp switch is pressed, the instrument panel integration module (IPM) Rear Fog Lamp Switch Input is grounded. In response to this input, the IPM sends a Class 2 message to the rear integration module (RIM) changing the state of the rear fog lamps. The state of the rear fog lamps will reset to off between ignition cycles. Battery positive voltage (B+) is supplied at all times from the rear fuse block EXPORT LGT Fuse to the REAR FOG LAMP relay switch. Battery positive voltage (B+) is supplied with the ignition switch in the ON or START position to the REAR FOG LAMP relay coil. The REAR FOG LAMP relay is located in the rear compartment relay center. When the rear fog lamp state is on, and the front fog lamps or park lamps are on, the RIM grounds the REAR FOG LAMP relay coil. With the ignition switch in the ON or START position, the REAR FOG LAMP relay coil is energized and the switch contact closes. Battery positive voltage (B+) is supplied to the LH and RH rear fog lamps. The LH and RH rear fog lamps are both permanently grounded, so both rear fog lamps have power and ground, and then light.

The rear fog lamps indicator may only be ON during RUN. The IPC illuminates the rear fog lamps indicator when the rear integration module (RIM) sends a class 2 serial data message indicating that the rear fog lamps are ON.