So the other day my side lights, rear fog light, number plate lights and dash illumination stopped working. All I have is main beam and high beam, brake lights, reverse light and indicators and the individual dash warning lights work. I have gone through all the fuses twice, tried swapping the tail light ilumi relay with the rear Def relay and I have also replaced the entire stalks and parking light button part but still no joy. I can't find anything loose and can't find any breaks in the wire. It was a case of working one day. Didn't use the car for a few days and then when I went to use it nothing. Has anyone got any ideas as to what else it could be or something I may have overlooked. I am thinking possibly the illumination control unit/module but I am unable to find a second hand one to test this. Does anyone have any ideas as the where I can get one and if that could be the root cause of my lights failure? Your help is much appreciated.

 

Have you checked the main lighting fuse under the bonnet?

I had this happen to me last week and it was a fuse.

 

Have been out there this morning and cleaned both engine bay earth terminals and pulled and checked every small fuse and looked at the big fuses but they all look fine!!!

 

The one that had blown for me was a 20 amp. If you have a spare one change it. Sometimes they blow but don't look like they've blown.

 

As above: blade fuses have a habit of LOOKING OK, but being not OK.

Failing that, you might have some corrosion in the bottom of the fusebox. There was a thread on here recently where a fuse holder had corroded away completely.