I have a 99 e320 and i have not started it for a while. Today, i went to get something out of the glove compartment and the car would not unlock. I had to manually unlock it. Basically, i am assuming that the battery is dead. Where is the battery? What is the problem? Should i just jump the car again? Please advise. Thanks.

 

the battery is under the rear seat so you won't be able to get to it. if you haven't driven it for a while it may just have lost charge. Try jumping it but if it doesn't hold a charge you will have to have it replaced. I had to have my 99 E320 battery replaced by the dealer recently, even though when I bought it they told me it is a "no maintenance" battery and supposed to last longer than 6 years...

 

One thing to remember about a battery.

Even if it starts your car, it doesn't mean it's a "good" battery.

The main thing is "will it handle a load".

Most people wait until it's too late to even get their battery checked. A bad battery can cause such a host of problems that you can't even imagine.

Make sure you check it at least annually, and when I say check it, I mean check it with a load tester or a battery tester.

That way you know you are good to go !

 

Thanks for all the info. How do i jump start the car. Where should i connect the jumper cables?

BTW, Would i have to re sync everything. Are there other things i need to do when the car is finally jumped. I heard everything resets? Please Advise. Should i call MB roadside assistance and have them jump the car or should i buy a new battery. I also heard that MB batteries can only last for 5-6 years. Thanks

 

We own two 99 Mercedes and even after 5 weeks sitting this summer both started without hesitation on original batteries.
Before you jump the car, start to recharge the battery. Jumping suppose to be done on the battery clamps.
Seats in E-320 folds easily and than it is just small cover to remove to get to the battery. Some cars have jumping terminal under the hood, but looking for it at one time didn't see any. Not that I needed it, just curious.

 

BTW for jumping car with dead battery you need at least #6 cables.
Throw those #10 if you have them far away.

 

What is #6 and # 10? Which seat is it under? Sorry for all the questions? How about the whole re-sync things. Doesnt every thing reset?
Thanks for lal your help guys.

 

#6 is the size (diameter) of the cable. On some cables it is imprinted on the insulation.
Battery in E320 is under right, rear seat.

 

OK... Here's my opinion on a couple things....

Frankly I wouldn't jump start it.

I would ONLY jump start a car (with an onboard computer) if I was stranded somewhere and it was my ONLY option. I've seen WAY too many onboard computer systems get smoked by over voltage/current issues caused by people jump starting their cars. And let me tell you they can get REALLY EXPENSIVE !!

If the battery is over 4 years old, I wouldn't even mess with... just go buy a new one.

If you have the convenience of another car, I would pull the battery, charge it if you have a charger, then take it somewhere and have it impedance/load tested. This will tell the story right away. If it's actually ok, then you have something in your car causing it to drain.

If the latter is the case then you will need to perform a current draw test and start pulling fuses one by one until you nail down the circuit that's causing the drain.

Anyway .. hope this helps

 

I want to thank everyone for all there help, but after careful thinking, i have decided to call the 24hr mercedes service and i will have them replace the battery. The battery is over 5 years old. I will let you know how that goes. I believe they will bring a battery and i will just pay for the battery. Thanks. I will also post my pictures when my car is fixed. My mercedes was involved in an accident. Thanks