E-Class (W210) 1995-2002: E 200, E 220D, E 240, E 290TD, E 300TD, E 200, E 240, E 280, E 320, E 420, E 430 (Wagon, Touring, 4Matic)

E200 pump battery drain

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Old Feb 24, 2013 | 06:19 AM
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Mercedes E200 CDI
E200 pump battery drain

Hello all,

I have a strange motor running all the time and draining my battery. Battery goes empty after about three weeks of using the car. We have checked all the fuses one by one and found that number 4 (ADS SE) if faulty and causing the battery drain. After that we have also found that some strange motor is running full time under the hood. What is motor for? It looks like it is pumping some fluid around the car.
What control box is responsible for this unit?
Thank you!
Attached Thumbnails E200 pump battery drain-motor.jpg   E200 pump battery drain-motor2.jpg  
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Old Feb 27, 2013 | 12:11 PM
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Mercedes E200 CDI
I have changed the relay (12V/30A) and it seems working. When I press REST or turn the ignition ON pump starts going. When ignition is OFF pump stays OFF as well.
However don't know why this relay is there and where the wires go.
I have been the owner of this car for about a 1/2 year and problem appeared couple of months ago.
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