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XBV100480 COVER FOR FOG LAMP (PR) MGF £ 22.56

cover instruction 1

cover instruction 2

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Rear fog guard lamps are incorporated into the tail lamp units. A warning lamp in the instrument cluster illuminates when the rear fog guard lamps are on. Operation is controlled by a switch on the centre console and the multi function ECU. For the rear fog guard lamps to operate the headlamps must be on and the ignition switch must be in position II. Rear fog guard lamps operation is automatically cancelled at ignition off.

Power supplies
Fusible link 1 in the under bonnet fuse box supplies a permanent feed to the headlamp lighting switch on a brown wire.
Fusible link 4 in the under bonnet fuse box supplies a permanent feed to the ignition switch on a brown-pink wire. When the ignition switch is in position II, the feed is connected to fuse 1 in the passenger compartment fuse box on a black yellow wire. Fuse 1 supplies the feed to the coil of a fog lamp relay in the multi function ECU on a green wire.

When the headlamps are on, a feed from the lighting switch is connected to fuses 9 and 11 of the passenger compartment fuse box on blue-pink wires.
Fuse 9 feeds the switch contacts of the fog lamp relay in the multi function ECU on a blue-red wire.
Fuse 11 supplies a feed to a switch in the multi function ECU on a blue-black wire.
Pressing the rear fog guard lamp switch temporarily earths the switch in the multifunction ECU by connecting the red-yellow wire, between the multi function ECU and the
rear fog guard lamp switch , to the Black wire between the rear fog guard lamp switch and an earth point. The switch closes and earths the coil of the fog lamp relay on the Black wire between the multi function ECU and an earth header. The fog lamp relay energises and connects the supply, from fuse 9 in the passenger compartment fuse box, to the blue-yellow wires between the multi function ECU and the:

- LH and LH rear fog guard lamp; the lamp is earthed by a Black wire connected to an earth header and illuminates.
- Rear fog guard warning lamp in the instrument pack; the warning lamp is earthed by a Black wire connected to an earth point via the passenger compartment fuse box and illuminates.
- Tell tale LED in the rear fog guard lamp switch; the LED is earthed by a Black wire connected to an earth point via the passenger compartment fuse box and illuminates.

Turning the ignition switch off, or pressing the rear fog guard lamp switch again, de-energises the fog lamps relay and extinguishes the rear fog guard lamps. Turning the lighting switch to side lamps or off extinguishes the rear fog guard lamps but, while the ignition switch remains in position II, the fog lamp relay remains energised. If the lighting switch is subsequently turned back to the headlamps position, the rear fog guard lamps illuminate again.

12V/21W GLB 382 is hopefully the right No.
To answer your question.
I assume the relay is located inside the MFU, but can be wrong.
http//:www.mgfcar.de/MFU/index.htm

BTW. the plastic frame of the foglight (right one) has the number VBU100540, but it is not listed in the MGR spares files.