2002 Mercedes Benz C320: battery drain or dead battery

Filed Sep 5, 2024 · Electrical · PA

Battery drains after being parked overnight, 58,000 miles, dealer maintained since new. Driven by a little old lady until I bought it. Took it to the dealer and they replaced one of the seat modules. Soon afterward, the problem recurred. Took it back to the dealer and they said it was a defective fuse box and replaced it for $650. Went to pick up the car and the battery was dead again. After some complaining, they refunded the bill. They looked at it again and said the problem was somewhere in the dashboard and it would cost $2300 just to take it apart and look for a bad module. They offered $2300 trade in toward a new or CPO car, and said my car would be sent to the crusher. I took the car back and installed a remote operated battery cutoff, and have been driving it ever since. Other than disturbing the engine computer, it's been running well for three years and 20,000 miles. Lovely car otherwise.

Filed Aug 7, 2017 · Electrical · IL

Battery draining

Filed Nov 4, 2014 · Seats · 84,300 miles · FL

The seat control units do not shut off and continually drain the battery. This is a widespread problem for this model car.

Filed Jan 14, 2014 · Seats · 81,000 miles · TX

Tl* the contact owns a 2002 mercedes benz c320. The contact stated that the vehicle failed to start. The vehicle was taken to the dealer where the technician diagnosed that the power seat module was draining the battery and as a result, it needed to be replaced. The manufacturer was not made aware of the failure. The vehicle was not repaired. The failure and current mileage was 81,000.

Filed Mar 22, 2013 · Electrical, Seats · 89,000 miles · FL

Tl* the contact owns a 2002 mercedes c320. The contact stated he had to replace the battery in the vehicle several times. The dealer stated the seat controls for the passenger seat drained the battery and the seat control module needed to be replaced. The failure mileage was 89,000 and the current mileage 90,904.

Filed Apr 28, 2012 · Electrical · 40,000 miles · NY

On 1/14/2012 car wont start battery dead, call aaa tow truck. Jump battery ok used cared next day and on faul come up on my cars troulbe screen to indicated that I had any other trouble in any system it the car, we when to fl on the on the 16 of january car was home (in ny) son was going to take of house and start car once a week. Received phone call from my son on 1/17/2012 car wont start,battery dead, and key wont turn. On 4/21/2012 come home from fl fround dead car and transmistion leaking.called mercedes benz for a toe to the shop.this is thr thired battery since a have this car.battery was under warranty.it was chaneg lest then a year ago. M/b shop informed me battery was dead. Cause my seat modules shorted, to replace modules was cost $1200. I feel that the battery cause this trouble and the the modules should be replaced by b/m at no cost to me.

Filed May 11, 2011 · Seats · FL

Mercedes 2002 c320. Power seat control module for both driver and passenger drain the battery to a extent that car can not be started up. Only solution is buy a new ($500.00 plus labor) control module. I've done a research in different mercedes forums and it seems to be a common problem among these models. Mb despite of all the people having the same problem has not issued any recall.

Filed Feb 25, 2011 · Electrical · 97,000 miles · OH

Tl* the contact owns a 2002 mercedes benz c320. The contact stated that the battery continued to fail each time the vehicle was started. The vehicle was taken to the dealer who advised that the seat module was draining the battery that was located under the front driver and passenger seats. The contact stated that he had to purchase two batteries within four months due to the recurring failure. The manufacturer was not contacted in regards to the failure. The failure mileage was 97,000.

Filed Dec 13, 2010 · Electrical · CA

I have a 2002 mercedes c-320 car that the battery will not hold a charge! I had the mercedes dealer come to my home and put in a new battery. After spending $300 and 2 days later the new battery was dead. I was told it could be the alternator/regulator by the mb dealer and the cost would be $1,200. I took it to my local mechanic, who works on for. Cars, and they replaced the alternator/reg. For $512 out the door. 2 days later the battery was dead again. I was told my new merc. Battery was not good and they replaced it. 7 days later my battery died again. My local mech. Told me to take it back to the mb dealer as there seems to be a problem with their module and they should replace it for free as through his research many individuals are having the same problem. Clearly a defect part by mercedes as through my and my mech. Research, the mb mech are replacing the old modules with a new and improved one to fix the problem. I now have now had aaa to come and charge my battery once again and I will take it to the mb dealer. I hope they a will do the right thing.

Filed Apr 13, 2010 · Electrical, Seats · 44,975 miles · CA

At 45,000 miles front passenger seat started draining the battery. Dealer told bad control unit. Because of high cost of repair ($900.), it has been disconnected. The control unit was least utilized for the passengers seat. This should not have failed under 45000 miles use.

Filed Feb 4, 2010 · Seats · CA

We have a 2002 mercedes c320 wagon. The automatic driver and passenger seats drained the battery completely where the car will not start. We have disconnected the module seats so that it will stop draining the battery. The replacement for each module system for the seat is about $500 or more. I believe this is a manufacturer's defects as it is dangerous if owners are not aware of the situation and leave their car park for a period of time will cause the owners not able to start their car, especially in an emergency situation.

Filed Dec 27, 2009 · Airbags, Brakes · 92,887 miles · CA

Mercedes benz 2002, c320 *steering wheel malfunction *SRS warning *seats malfunction *brake and oil fluid misleading info *battery drain *turning signals requiring new harness that cost a lot $$$.