Fog/Driving Lamp: Description and Operation

With the ignition switch in the ON or START position, the fog lamps will illuminate when the driver places the front fog lamp switch in the ON position. The front fog lamps will deactivate when the high beam headlamps are turned on. The underhood fuse block supplies battery positive voltage to the switch circuit of the front FOG LP relay. Ignition voltage is available to the FOG LP lamp relay coil. The Dash Integration Module (DIM) controls the FOG LP relay coil. When the front fog lamp switch is in the ON position, the front fog lamp input of the instrument Panel Integration Module (IPM) has ground. In response to this input, the IPM sends a class 2 message to the DIM, which energizes the FOG LP relay. The IPC illuminates the front fog lamp indicator when the IPC receives a class 2 message from the DIM after the front fog lamps have been requested. When the DIM energizes the front FOG LP relay, the current flows from the FOG LP relay switch to both front fog lamps. The front fog lamps have ground at G402. The state of the front fog lamps (on or off) will remain the same until the front fog lamp switch is pressed again, even between ignition cycles. When the front fog lamps are on, the park lamps will also illuminate.