Question about 1990 Mercedes-Benz S-Class

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My interior door light wont go off when i turn the key off or shut the door.

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Hi

The door switch in one of your doors is faulty... The switch that triggers courtesy lights when door is open then disables light when door closes.Also check did you turn it on with the interior dimmer control on your dash, left side of the steering wheel?

You may need to replace the latch mechanism in the door. But more than likely it is just stuck...if i am not mistaken; it is a magnet system so it just got jammed. All you have to do is spray the **** out of the door hinges and door looks with wd40 or some other spray. Actually the problem is that there is a sticky switch in the door latch mechanism. This switch is telling the computer that a door is open, even when it is not. Keep in mind that it may not be the driver's side door that is at fault, so you might want to do all 2 or 4 doors, depending on your model.
At each door you will see the latch mechanism. Just above these latches inside each door is the switches. To unstick these switches you will need 2 types of spray lubricant. Use WD-40 (or equivalent) and a can of silicon spray lubricant.
With the plastic tube attached on the WD40 you will spray inside the latch and in between the latch to get the spray to lube the switch. Flooding is preferred. Go to each door and do this. Open and close each door multiple times until the switch is free and the indicator lamp goes off.

Please get back to us if you have further query or else please accept the solution.

Posted on Sep 16, 2011

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