Fog Lights

[Old Mosher]

Hi.

I noticed the other day that both my fog lights are not working. The dash lamp lights up, I can hear the relay go in but no lights. I've checked the fuse and the bulbs with no fault found. Any Ideas anyone?

[paul.h]

Is this the front fog lights or the back ones and is it a hatchback or estate ? The fog light switch first twist puts on the front fog lights and their dash lamp and the second twist puts on the rear ones and their dash lamp - in both cases the engine needs to be running but I guess you already know all this. On the hatchback the rear fogs are part of the tail light bulb with a separate one for the brake lights but on the estate it is a separate fog lamp and a combined tail/brake lamp.

[Old Mosher]

Opps, :rolleyes: Its a 2001 2.2Hdi hatch back. I found and tested the lamps, fuse, switch turns the dash light on and off when the engines running and lights are on But there's no power at the lamp holder. Could it be in the towbar wireing I'll have to pray for no fog. It dosn't have front fog lamps though I often see C5 front fogs for sale on Ebay. Can they be retro fitted, do I just need to add the fuse relay and lamps or is it more complex than that? :blink:

[paul.h]

This is from Haynes - Separate front fog lights were fitted to the mark 2 C5 but on the mark 1 when fitted they are in the main headlight as a 60/55 H4 bulb shared with the main beam. When not fitted the main beam is a 55 H1 bulb. So you will be lacking a third wire and 3 pin connector plug to the bulb and it is likely the BSI would need programming.

 

In the towbar 12N socket, some are fitted with a pin that disconnects the car fog lights as the trailer plug is pushed in place. This pin pushes apart contacts within the socket so it could be this that is the problem if you have this type of socket and it has been wired up to do this - the pin (visible if looking at the socket with the cover lifted) could be stuck or the contacts could be dirty.

 

If you have a meter, check for a 12 volt supply to the rear light bulb holder, remembering the fog lights are shared with the tail light bulb 21/5w type. Do all the other rear lights work, showing the earth is ok ?

 

The following assumes you do not have a Citroen specific towbar harness: - you can check the connections at the towbar relay - should be a 7 way bypass type with a blue wire connecting to the car fog light wiring. Provided this relay fuse is ok (likely to be connected at the battery and probably 15 amp), there should be a 12v output on its blue wire to the towbar socket with the engine running/the car dip beam on/and the fog light switched on. If the towbar has been wired to disconnect the car fog lights with a trailer plugged in, then there may be another wire from the towbar socket back to the car fog light. Haynes shows a single fog wire from the BSI to the rear and then it splits at the left light back to the right light - so for the towbar to disconnect the car fogs, this single wire would be split, the supply go to the relay and possibly the towbar socket and a return from the socket back to the car lights. If it has been wired this way, I think it may be possible to just rejoin the car wires, keep the connection to the relay and remove the ones direct to/from the towbar socket if this is the cause of the problem.

[Old Mosher]

Thank for all the info Paul, very helpful. I found the fault in the boot liner. A relay had a bad connection. Pushed it all together and now its working ok.

As for the front fogs I couldn't see any extra wire on the main been so I guess thats a nonstarter. Would the mk2 units fit in the grill on the mk1?

[paul.h]

The mark 1 and mark 2 front grills are different so to fit mark 2 fog lights would need some mods. The mark 2 fog lights look similar to on the C3 and C4 so there are options if using a scrap yard and you would probably best run separate wires and a switch/relay/fuse outside of the car existing wiring/BSI. These round lights are held by screws in to part of the grill and the beam height is adjustable by a long screwdriver from underneath - I had to do our C4 recently. A look at the parts on the service.citroen website will show you the possibilities (if not already registered this is allowed as part of a car club in the terms/conds such as this one) - you could also see what parts your car is missing if it had the normal fogs for a mark 1 C5.

[MikeLane]

The mark 1 and mark 2 front grills are different so to fit mark 2 fog lights would need some mods. The mark 2 fog lights look similar to on the C3 and C4 so there are options if using a scrap yard and you would probably best run separate wires and a switch/relay/fuse outside of the car existing wiring/BSI. These round lights are held by screws in to part of the grill and the beam height is adjustable by a long screwdriver from underneath - I had to do our C4 recently. A look at the parts on the service.citroen website will show you the possibilities (if not already registered this is allowed as part of a car club in the terms/conds such as this one) - you could also see what parts your car is missing if it had the normal fogs for a mark 1 C5.

 

Hi Paul - the nearside front fog lamp on my 2005 facelift C5 is smashed so I tried (as you suggest) to go on the service.citroen web-site. It's in French, which is OK, but wouldn't allow me to register as an individual (particulier). Is there a UK or French site which will allow me to register as a "Club Member", so I can see how to replace the lamp or should I just say I'm a "professionel" ? (All I really want to know is how to get at the lamp fixings: from the front of the car? underneath? through the wheel arch? etc.)

Thanks - Mike.

[paul.h]

When you go on the service.citroen website you can change the language at the right side, either top or bottom depending on which page you start from. When you register you need to do it as another professional and then a member of the Citroen Owners Club which is allowed under the terms and conditions as a member of a car club. http://service.citroen.com/do/changerParametres

 

You could do with a copy of the Haynes manual for the C5. According to this on the mark 2 C5, access to the front fog light is by removing the engine under shield if you wish to replace the bulb. If you want to remove the fog light, it says to use a screwdriver to prise out the fog light external plastic surround from the bumper at the edge nearest the middle of the bumper. Then remove 2 screws and the light can be pulled out of the front of the bumper and the electrical connector removed. Once removed you will notice a beam height adjuster screw at the bottom of the light - when the new one is installed it will need adjusting from underneath by unclipping the undertray.

[MikeLane]

Once again, thanks Paul.

[MikeLane]

"You could do with a copy of the Haynes manual for the C5."

Bought one (£11.99) and a new fog lamp (£15.20) from NP Autoparts. Took about 5 mins to replace the lamp - which came fitted with a H11 bulb! Good value.