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Mercedes-Benz C320 Dead Battery Due to Failed Seat Control Module

 
Mercedes-Benz C320 Problem
47 Reports
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Model Years Affected: 2001, 2002, 2003, 2004, 2005

Average Mileage: 90,066 mi (45,000 mi - 183,315 mi)

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A dead battery can be caused by a faulty seat control module that does not properly shut down.  Spilling liquids on the front seats can cause these modules to fail.

  • Visitor, , 48,600 mi

    Faulty seat control module. Quick fix published here
    http://www.youtube.com/watch?v=CCt9RGJN54M

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  • Visitor, , 65,900 mi

    Common problem. Dealer wanted $500 for a new seat module. Instead of buying the seat module I bought a $3 "momentary on button" at the auto parts store, cut the ground wire to the seat module and connected the ends to the "momentary on button." Then I mounted the momentary on button on the underside front of the seat. Adjusting the seat became a two-handed affair, holding the momentary on button with one hand while using the other hand to use the adjustment controls, slightly more complicated than original, but saved $500 by not buying the module. The momentary on button connected in this way interrupts the current to the module when it is not in use, that way you won't drain your battery.

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  •  Rookie

    Dead battery due to failed seat module to mee too. I have have mercedes roadside come out and replace my battery 3 times, for which I had to purchase one, In a matter of one year. First they unplugged my passenger seat stating that it was draining my battery. The last or third time they replaced my battery they unplugged the drivers seat stated that too was draining my battery. I understand that this may have been a recall and I was never aware of the recall when I purchased this in 2002. Now I and a passenger in my car cannot adjust the seats. It would be good I get an apology from Mercedes and repair this!

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  •  Rookie

    Battery Drain. 1.3 amp draw on battery when vehicle is turned off draining battery very quickly. Likely the SCM's not "sleeping". This is ridiculous(fraudulent) considering the frequency and number of reports that these Seat Control Modules haven't been recalled and batterie charged or replaced at Mercedes Benz expense.

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  •  Rookie

    i have to unplug my front passenger seat so that the battery will not die. I was told by a mechaninc to just keep the seat unplugged until I am ready to fix it.

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  • Visitor, , 50,500 mi

    battery kept dying, replaced battery, problem returned after two days, diagnosed as bad seat module, was told only dealership could fix, this car has cost me a fortune

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  • Visitor, , 128,000 mi

    This has caused me unbelievable problems. Where and how do I fix it??

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  • Visitor, , 70,000 mi

    Mechanic has traced my recurrent dead battery problem to the passenger seat module. It seems more than one owner has had this problem, why hasn't Mercedes Benz issued a recall? They continue to deny this is their problem!

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  • Visitor, , 54,800 mi

    Car would not start and had AAA come in to jump the car. They said it was battery so replaced the battery. Less than a week later the car will not start gain. I see the same issue on BenzWorld.org for hundreds of folks upto 20 pages of listings...

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  • i have same problem with my seat module causing dead battery on both side passenger and driver. I have to leave them unplugged to avoid the high cost repair.

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