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Strange fault - illuminated switch lights come on with brake light

Having a strange fault with my LE. When I brake, the illuminated switch lights for the heater fan and the map light come on. Any ideas of what to check? The rear lights are double earthed and to the boot catch (and cleaned/checked) I cleaned all the fuse box blades and holders too.

Any ideas of what to check next? Any earths under dash to check and clean?

No clue what so ever. Any damp in the plugs?

Bob Hubbard

Could there be a short in one of the rear light bulbs between the 2 filaments and perhaps the side lights are lighting too??
Test it with the rear bulbs out...

I'll give that a try 🙂 Any more ideas? Where does the front and rear loom join up? Behind the front wing? I was wondering if it's a dodgy connection there.

That's a first on me but Agree with chris as there is a link somehere between the sidlight & brake circuits

If it ain't broken don't try to fix it as if you do it will definitely break

Well you all pointed me in the right direction. Cheers! It seems like one of the LED bulbs I'd fitted in the rear had gone faulty. When I braked it, the sidelights came on! Not just the illuminated bulb lights. 😮

Great! One way to get the attention of other drivers when you brake?

Dodgy Chinese wiring in the LED lamp....


I might see if I can get some SMD style ones. I'm still a firm believer in using LEDs, purely from all the load it saves on my knackered out wiring.