W211 Door module draining Battery

[wilko50]

Hi to you all, Please help me if you can ! My rear off side door started playing up, windows wont go up , door wont lock etc. I suspect the door module has gone bad. I can live with it and not use that door, but my battery has started to suffer and is dropping to 11.9 Volts overnight. The battery is quite new and was damn expensive. I suspect my auxiliary battery is helping to start the car , thats also new but will get strained and give up the ghost. Maybe that door module is being parasitic which is known in these cars along with seat mod. When car is running is 13.5 to 14.5 volts so normal. Can I just pull the fuse on that door and leave it be ? also do you know where the fuse is and will it cause problems. Hope you can help and save me from losing more money

 

[BlackC55]

Measure the drain first and report back. It should be 0.06A and not much more than that. Put an Ammeter in series off the earth and lock the car and wait 20 mins.

If you have a drain try disconnecting that control unit first and see what you get then.

 

[wilko50]

Measure the drain first and report back. It should be 0.06A and not much more than that. Put an Ammeter in series off the earth and lock the car and wait 20 mins.

If you have a drain try disconnecting that control unit first and see what you get then.

Thanks for replying, will try