Munky

Hey guys,

I am hoping you might be able to help with this frustrating problem .

I have no back light illumination when the headlight switch is turned on, at the instrument cluster, heater controls, whole center gear shift console and steering wheel. If you push a button like EC or Rear Window Heater the on and off button light works but I have no visual back lighting when its dark. All other electronics displays and warning lights work fine on the dash.

What I have done so far is test every fuse under the bonnet, in the boot and to the right of the steering wheel in the dash when you open the door, all were ok. I have also disconnected the battery for 5 minutes and reconnected, no change. I have checked every light around the car, from headlights to indicators, boot license plate, fog, parking, etc etc and they all work. I have had the odd "Check Bulb Warning" messages very randomly for a few months but it was intermittent and went away normally on a restart, I checked all bulbs back when I had the messages and I had none out, so I assumed it was a sensor playing up. But I have not had this warning message come back for at least a few months now.

Before I run this into MB or other garage for probably a big bill. If anyone has any views or thoughts about how to fix this myself I would greatly appreciate your responses.

Cheers
Munky

MarcusF

If the dimmer isn't turned all the way down, and the dimmer switch isn't broken, then it sounds like electrical diagnostics will be required.

Munky

Hi Marcus,

Thanks for your response. I have tried the dimmer and that does not work either. Looks like I will have to run it in for tests.