mot fail, rear fogs

Need technical Q/A then you're in the right place

Moderator: martauto

mrb27
E30 Zone Regular
E30 Zone Regular
Posts: 345
Joined: Wed Nov 17, 2010 11:00 pm
Location: Essex

Post Thu Mar 22, 2012 12:11 pm

hey all, just had my car mot'd and its faild on the basis that the rear rogs dont work at all, nor does the light on the dash when turned on, checked fuses and all ok there, buld in dash is in tact, where do i start?

thanks all
Image

Uploaded with ImageShack.us
Topblag
Old Skooler
Old Skooler
Posts: 7095
Joined: Wed Jul 30, 2008 11:00 pm
Location: Fife - You got a problem with that ?

Post Thu Mar 22, 2012 12:40 pm

I would suggest swapping the switch that activates them and seeing if that makes a difference.

The only dependancies the fog light has is the driving lights being on and the fog light button pushed in IIRC.
1990 325i Cab auto in Alpine White II
1988 Alpina C2.5 moredoor in Black, 71k
1990 325ix, moredoor auto in Laser Blue. 51k
1984 Hartge H35 in Black
2004 996 C4S in Silver 43k manual
2006 Audi S6 V10 in Black 58k
Grrrmachine
E30 Zone Wiki / Team Member
E30 Zone Wiki / Team Member
Posts: 8043
Joined: Sat Feb 09, 2008 11:00 pm
Location: Warsaw, Poland

Post Thu Mar 22, 2012 12:41 pm

The switch, I'd expect. Pull it out and bridge the terminals to see if a) the dash bulb glows b) the lights themselves glow.
mrb27
E30 Zone Regular
E30 Zone Regular
Posts: 345
Joined: Wed Nov 17, 2010 11:00 pm
Location: Essex

Post Thu Mar 22, 2012 12:57 pm

ok cool ill try that, what 2 do i bridge? there are about 4 wires iirc
Image

Uploaded with ImageShack.us
User avatar
Brianmoooore
E30 Zone Team Member
E30 Zone Team Member
Posts: 49360
Joined: Mon Jan 10, 2005 11:00 pm

Post Thu Mar 22, 2012 1:36 pm

Bridge 2 (yellow/black) and 4 (grey/purple). Dipped headlamps or front fogs and ignition has to be on.
If they don't work, feed 12 volts directly to pin 4.
mrb27
E30 Zone Regular
E30 Zone Regular
Posts: 345
Joined: Wed Nov 17, 2010 11:00 pm
Location: Essex

Post Thu Mar 22, 2012 3:05 pm

sorted :) wasnt sure what to bridge so i just took a look and it seemed there are 2 wires on each side of the switch, so i took a guess and connected both wires that was on the rear fog side of things and it worked. dash light came on and so did the rear fogs. thanks for the info guys :D
Image

Uploaded with ImageShack.us