I have a C320..Do the electrical functions in this model drain the life of the battery? If so what is the life of a mercedes battery?


Asked by Nov 04, 2012 at 12:48 PM about the 2001 Mercedes-Benz C-Class C 320 Sedan

Question type: Maintenance & Repair

Car will not turn over. Not malfunction lights are on.

5 Answers


sadly the c-class has so many electrical issues, even more sad is the fact that up through 08 the issues still haven't been resolved.

3 of 3 people found this helpful.

What's sad is someone gives an opinion without a possible solution. Normal quiescent draw on your car is 20 mA. At that rate a good battery will never fail. What's common on your car, which I assume has power/memory seats, is the seat control units. One is probably not shutting off which will cause other control units to stay turned on thus draining the battery quickly. To test, put a fused amp meter in series with the battery. Simply remove the fuses for the seat control units, which are located on the back of the headlight switch. There's a cover that just pops off for access. If you don't have an amp meter then just leave them out for a while a see if the battery stays up overnight. Put one back in .... and so on until you figure which one is bad. The control units are under the front seats.

6 of 6 people found this helpful.

Thanks Ted. What is 20 mA? Another issue would be the vanity lights on the visors stop lighting up and the head rest in the back seat stop rising. Are these issues as well of fuses?

4 of 4 people found this helpful.

I have a c320 2001 , my back lights will not turn off. How can I correct this

2 of 2 people found this helpful.

My mercedes c320 2001 back lights will not turn off. How can I correct this issue

1 of 1 people found this helpful.

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