It's a 1.2 car (8V) of early 2007 vintage. I've tried a search and have come up with about equal numbers of threads saying the rear fog light doesn't have a fuse, and threads saying that it will have one. SURELY it has a fuse?! Looking in the owner's handbook though, I can't see one listed though?

Does anybody have a definitive asnwer as to whether it has one (and a relay) and if so, where, please?

I see the mini fuse on spot 25

And the relay on 20.

Thanks for that. I take it that's in the main fuse box under the bonnet? I'll have a look in daylight. According to the handbook, F25 is "absent"!!

yes main fusebox

You need to check slot 25 (that's Fuse F31 on diagram)
and relay in slot 20 (that's T14 on diagram)

Excellent! Thanks. I'll have a look next time she's round.

cmosfxx said:

yes main fusebox

You need to check slot 25 (that's Fuse F31 on diagram)
and relay in slot 20 (that's T14 on diagram)

Click to expand...

Oh well, back to the drawing board! I had a quick look and there is no fuse in slot 25, or relay in T14 on her car. Working backwards through the handbook though, I noticed that F32 is listed as the FRONT fog light fuse? It's the REAR fog light I'm having trouble with. (Her car doesn't have front fogs, so that explains why that fuse and relay are missing)!

Ok I think I was wrong... yes that's the fuse/relay for the FRONT fog light only you're right indeed.


From elearn:

FOG LIGHTS
Body Computer controls the supply to rear fog lamp from pin 12 of connector C.

I don't see a fuse for the rear fog light on the body computer... weird.

Is the rear fog light on the dash working when you press the button?
Is there any voltage on the bulb holder?

Aaaarrgghh! I think I'm stuffed now. Might try to get a copy of multiecuscan and a lead and see if my old laptop can run it. Someone suggested doing a "proxy-alignment" or somesuch? It seems there's a possibility that the body Control module isn't telling the fog light to come on.

When I press the switch on the dash without the headlights on, nothing happens (as expected). When I turn them on and then press the rear fog switch, the telltale symbol on the dash illuminates correctly and then a few seconds later, the bulb failure warning light comes on. This stays illuminated (even if I turn the fog light off) unti lthe ignition is turned off and on again.

At no point in all of the above does the rear fog light itself illuminate! If I take the bulb out of the bulb holder, I get about 5 or 6 volts across the bulb contacts. I chased the wires back through the rear panel into the boot and checked them again inside the boot (stuck pins into the insulation and then meter probes on to the pins). Still about 5-6 volts. I've cleaned the earth point on the left hand inner rear wheelarch but still no improvement in voltage. I'm a bit stuck now and the MOT runs out on the 31st!

To be honest, I think the CAN body control module is probably working fine (it is sending its signals out when the switch is pressed), so I assume it drives a relay... (somewhere!) and it's the relay that has a high resistance. Surely the BCM wouldn't switch enough power to illuminate a 21Watt bulb, would it?

I cannot find a relay or a fuse anywhere. by the schematic it looks like a direct wiring to the body comp.

licence plate / reverse lights all ok ?

Thanks for that. Yes, all the lights on the back of the car (even the boot light) but except the rear fog works fine!

Do you know where the BCM computer is physically located within the car? About the only other thing I can think of doing is to have a look at the connectors on it and see that they're not corroded.

Success! I took the BCM out and disconnected all the plugs, then sprayed everything with switch cleaner. All the contacts LOOKED fine though, but I thought I'd do it anyway. While I was doing that, I noticed another couple of earthing points on the left hand chassis side member, so I cleaned those up too.

I don't know which of theose problems it was (the earth studs looked OK too) but I now have a working rear fog light AND the backlingts in the radio seem to be going fully off when the radio is switched off!

Thanks all!

Nice thanks for the update now we all know where to look at in the future

Where is the BCM located?? A picture would be much appreciated. Im having issue with the lower right light for punto grande 2007 2 door.