Front Fog Lamps Description

Front Fog Lamps Description
The front fog lamps are controlled by a non-latching switch located on the left hand side of the instrument pack. Two front fog lamps are located below the front bumper. Front fog lamp operation is monitored by the Body Control Unit (BCU) which only allows the front fog lamps to operate when the side lamps or headlamps are on.

When the side lamps headlamps or ignition is turned off the front fog lamps are extinguished. When the side or headlamps are switched on again the front fog lamps will not operate until reselected using the switch. If the rear fog guard lamps are switched on switching off the front fog lamps will also switch off the rear fog guard lamps.

The front fog lamp switch is illuminated when the side lights are switched on. Each front fog lamp bulb is rated at 21 Watts.

Front Fog Lamps Supply

Circuit supply
A feed from the battery positive terminal is connected by an R wire to the engine compartment fusebox where it passes through fusible links 1, 7, 8 and 13 and fuses 3 and 13. Fusible links 1 and 7 and fusible link 1 and fuse 3 are connected in series.

A feed from fusible link 13 is connected by an NG wire to the lighting switch.

A feed from fuse 3 is connected to the front fog lamp relay in the engine compartment fusebox. A feed from fusible link 7 is connected to the auxiliary circuits relay in the engine compartment fusebox.

A feed from fuse 13 is connected by a PN wire to the passenger compartment fusebox. This feed is connected to the Intelligent Driver Module (IDM) which is integral with the passenger compartment fusebox.

A feed from fusible link 8 is connected on an NW wire to the passenger compartment fusebox and from the fusebox to the ignition switch on an N wire.

Ignition switch supply
With the ignition switch in position I, the feed from fusible link 8 flows through the ignition switch to the passenger compartment fuse box on a LGW wire. The feed continues through fuse 26 in the passenger compartment fusebox and is connected by an LG wire to the engine compartment fusebox and the coil of the auxiliary circuits relay. The auxiliary circuits relay coil is connected to earth header C0018, via header C0286 LHD/C0288 RHD on a B wire.

In this condition, the auxiliary circuits relay is energised and the contacts close, allowing the feed from fusible link 7 to pass through the closed contacts to the coil of the front fog lamp relay.

With the ignition switch in position II, a second feed from fusible link 8 flows from the ignition switch to the passenger compartment fusebox on a Y wire. The feed continues through fuse 29 in the passenger compartment fusebox and is connected to the IDM.

In this condition, one of two electronic switches in the IDM closes. The earth path from the IDM is connected from the passenger compartment fusebox to earth header C0551 on a B wire.