Hi all,

Ran the car through a wash earlier today (against better judgement, self service was broken, hose pipe ban and dirty af) and immediately got the yellow exterior bulb warning light on the dash.

I've done a walkaround and everything seems to be functioning. Headlights, high/low beams, DRLs, fogs, reversing, and number plate lights are all coming on. There was some water on the headlight housing, but it's sealed and the rubber covers were dry.

I haven't been able to check the brake lights properly yet as I don't have a second person but expect they are fine.

The indicators are all working, but looking closely at the left wing mirror, it looks like maybe one of the LEDs in the strip might be out?

It's very bright outside today, so it is honestly quite hard to tell for certain.

My question is: would a single dead LED in that sealed wing mirror unit be enough to trigger the dash warning due to a resistance drop?

Or is it more likely just water ingress somewhere else from the pressure washer bridging a connection that will clear up once it dries out?

Any thoughts appreciated. Cheers.

My wing mirror has one out and no warning. Did have a warning a while back and it was corrosion in number plate lights. All lights were fine and working but the corrosion was enough to trigger bulb light. When I cleaned it the bulb was slightly brighter.

Alasdair

+1 for intermittent number plate bulb. Check the contacts.