LH Rear Fog Lamp

[Celtic Cousin]

While replacing the LH rear indicator bulb recently I noticed that the lamp holder appeared to have the fitting and wiring for a LH fog lamp bulb.

Of course it wasn't so easy as adding a bulb; does anyone know where the connection to the fog lamp circuit can be made?

Ps I hate people that drive around with rear fog lamps on when they are not necessary!!!

[Dave Avant]

This is a German thing, they think its safer/clearer to have just 1 fog lamp so its not confused with brake lights. BMW are the same.

Not sure on the connections other than tapping into the wire for the RHS. Wire for it may even come on the LHS as in Germany the fog lamp would illuminate on the LHS.

I may try this myself, as like you I hate ppl who use foggies unecessarily - more so at this time of year as some think either its foggy as they can't see out of the rear window or they press all the buttons to get the heated rear window on!! And its better to flash them with 2 fogs than 1!!

I'm getting the bleep noise on starting as I need to change my brake/tail light bulb - so may have a look then.

[Celtic Cousin]

Had a look again this weekend. The bulb holder appears wired and I just need to cutout the "blank" in the rear lamp cluster, but rather than run a wire across to the right hand side is there a central juction box?

[onzarob]

When i bought my car, I checked the bulbs and only one fog came on, so I got a bulb and tried fitting it, the hole is closed off so the backing plate wont go back, then I realised its only suppose to have one:aargh4:

I didn't check to see if the holder was live, but i would assume it is. I'm off to put the multimeter on it now, I'll let you know.

Rob:D

[Celtic Cousin]

I thought I tried the easy way by fitting a bulb into the holder. But no power

[onzarob]

Oh, ok you actully fitted the bulb ok and the back went back on, on my car it has a smaller whole to stop the correct bulb from fiting through.

I going out the door to look right now <img>:confused:

Rob :D

[onzarob]

Wow a bit chilly out there tonight, the bulb works in the holder on my year of car, but the back of the cluster has only part of the holder cut open, so the bulb doesn't go through. that would be an easy upgrade.

What year of car do you have? maybe they changed the design.

Rob:D

[Celtic Cousin]

2002 A4 Avant 130

I know its cold in Cornwall tonight, I thought you were being brave!!

[Dave Avant]

Well, I got round to changing the brake light bulb in my avant and thought I would try just fitting a bulb, but it doesn't light, I suppose it must have it wired in a certain way as if it was 'live' and a simple installation of a bulb worked, when there was no bulb present as standard, it would show a bulb failure on the driver info display, so it must need some electrical wiring input for it to work.

Mine is a 03 A4 Avant.

[onzarob]

You must be down this way? at least its not raining:biglaugh:

I would assume your Audi has a different wiring loom, tomorrow I will check the colur of the cable powering the bulb and you could check to seem if you have them on yours.

Rob

[Celtic Cousin]

Thought this was going to be an easy one to answer.

Back in my Peugeot selling days a standard mod was to fit a LH fog lamp bulb and remove the blank in the lamp. I thought the Audi was going to be as easy as that.

Had my hands on a Passat (S plate) today and checked its rear lamps. Seems to have two rear fogs as standard. They are fed by a grey wire with a white trace and the wire for the RHS appears to join in the connector on the LHS.

I assume that somewhere in the car the looms connect and I'm looking to bridge the connection there rather than run a wire across from the RHS.

Yes I'm from Cornwall, I can see the lights of the Four Lanes TV mast as I type, sorry about the weather I sent your way last night!

[onzarob]

I knew i would pay for saying it wasn't raining, haven't looked at the wires yet, I don't finish work till late.

Rob

[Celtic Cousin]

Fancied getting my hand dirty after Christmas; too much food and sitting around is not good for you.

The wire feeding the LH fog lamp is a grey with a white tracer. To access you need to remove the whole of the interior trim on the LH side in the load area. This is made more difficult in my car as it has the "wet boot" lining option! I intended to follow the wire up through the car to discover where it had been isolated (where presumably it had been disconnected from the wire feeding the RH lamp) however it appears to terminate in the loom just below the aerial connection box.

I picked up the loom again on the LH side under the rear seat cushion but the white/grey wire had disappeared!

On the opposite side under the rear seat there are two another looms one of which contains a grey/white wire providing power to the RH lamp.

Although connecting these wires allow the LH lamp to function it didn't end up so neat a mod as I had planned.

Trying to pick up the wire nearer to the RH fog lamp is complicated due to the subwoofer located in the RH rear wing and so making the connection under the rear seat seemed like the best option.

My car is a 2002 Avant