Electrical problem

[midge]

Rear seat light,trunk light, rear wiper and the trunk "self locking" mechanism doesn't work. Had the car to the work shop to check the problem. They checked some rear harnesses but couldn't find any faults and no fuses blown....any suggestions.?
Problem occured after changing the trunk window.

 

[midge]

In addition I measured 12v to the trunk closing motor and even to the rear wiper but no power to the rear seat light or the trunk light.

 

[Major774]

No power... Most likely wires split.

Check the boot wire harness for split wires.

I have just repaired some of my wires last weekend, I had no power for the boot lid and boot lights.

 

[midge]

Thanks..Just to clearify, There is power to the trunk closing motor and the wiper. I'll check for split wires to the light.

 

[Dec]

Test to see if your car alarm is working properly, check that the hazard lights flash when you lock and unlock the car.
When the alarm is triggered, the hazard lights should flash and the siren should sound.
See... http://www.mbclub.co.uk/forums/electronics/169666-w202-how-test-car-alarm.html

Dec

 

[midge]

May the alarm function be involved in my mentioned problems?
The hazard lights flash as they should but I'll do the "alarm test" as well.

 

[Dec]

When the get to about 10 years old the alarms usually give trouble when the become faulty.
Just something that is easy to check and worthwhile doing, unlike your wipers or your lights, you are unlikely to notice if the alarm becomes faulty. There may or may not be a connection with the alarm but no harm in checking.

Dec

 

[midge]

The alarm doesn't activate at all I think..no light is flashing inside the car..
Tried the opened driver window test...no flashing or alarm.
It is not the same button but there is a small light on the lock/unlock doors button.

 

[Dec]

When you lock the car with the remote and then reach in and open the door through the open window. the alarm siren should sound and the hazards should flash for about 3 minutes, if that didn’t happen then you must have a faulty alarm.
Did you try opening the bonnet and other doors as well during the test… just in case the door pin of the door that you opened is faulty?

Its best to isolated the alarm by unplugging the alarm siren, cover the alarm siren plug with electrical tape to keep it dry as the plug will be live all the time.
It remains to be seen if disconnecting the faulty alarm will have any effect on some/all of your other faults.

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Dec