Howto replace the battery in my 98 S70 without damage to ECU

Eirik · Post by **Eirik** » 25 Sep 2005, 16:24

Hi .
After reading this :
https://www.matthewsvolvosite.com/chat/p ... .php?t=177
I have a question for you guys and gals.
A year ago I had the problem as described with jumpstarting.
Now, as the car has been sitting in a garage for 3 months, I were to take it to service at the Volvo-dealer.
Totally flat battery. 0.3Volts DC..

I'm buing a new battery tomorrow, then checking the glovebox-lights etc for a "power-leak" .

How should I hook up the battery without damaging the ECU's of the car.
Jumpstarting is out of the question as the ABS-unit broke last time.

Should I make sure the battery is a little low when putting it in, then recharge it when it's hooked up completely ??
Or, are there any other methods ?

Best regards.

Jot · Post by **Jot** » 25 Sep 2005, 17:38

A new battery will be charged. There will be no problems in switching them out. A battery drain can be caused by the trunk light by opening the arm rest it can be easily checked. It is easy to turn on as it has a roller switch located next to the light.

Eirik · Post by **Eirik** » 26 Sep 2005, 17:25

Hi.
I've now replaced the battery with a new one.

Nothing seemed to go wrong ..

But, I've discovered where the drain was.

The courtesylights won't go OFF . Except When I set the sealingswitch to off.
Central-locking remote usually leaves the light on for some time, then tones it down, to off position.
I tried opening and closing all the doors, with no effect to the courtesylight.
There's three positions as I'm sure you know, ON-DOOR-OFF, on the switch.

Any ideas of where to look first?
The glove-box light i s off, same with the trunklight.
Since the courtesylight usually stays on for a few seconds, I'm sure the last person didn't notice it was on when leaving the car.