warning lights coming on with turning on headlights

kildair

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Help please,:confused::confused:
I have a 1999 E240 estate.
When switching the main headlights, varios warning lights come on including the ABS, BAS/ASR and handbrake on. In addition, the horn does not work.
Any advice. I remember in the past that on one occasion I had to change the brake light switch as the ABS light came on and had no cruise control.
Please advice
thanks
 

television

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All this points to a bad/poor ground lead somewhere, you turn the lamps on and other circuits are being used to find a ground path.
 
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kildair

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All this points to a bad/poor ground lead somewhere, you turn the lamps on and other circuits are being used to find a ground path.

So what do would you advise?
 

television

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I would check the ground wires for the headlamps first, it is not an easy job at all, are the headlamps at full brightness
 

Naraic

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As above...when this happened to me it was the earth point directly behind the offside headlamp. Later the whole area was cut out due to rust and new metal inserted.

Look for a bunch of brown wires...give them a gentle tug where they attach to the floor of the engine bay...
 

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