96 850 Turbo Wagon - Windows/Sunroof dead after jump

bnzelener · Post by **bnzelener** » 18 Aug 2015, 09:22

Hi all, I'm new to the forum but have been using MVS for years to find fixes. Thanks for a killer community.

I'm a fool. Yesterday I went to jump my dead battery in my 1996 Volvo 850 Turbo Wagon. I have an extra deep cycle lead-acid, so I was going to use that. I managed to misread the terminals on my deep cycle battery, and I plugged the batteries into each other in series. Worse yet, I didn't realize the problem until I went to start the car and got no start, and I smelled hot wires and a little smoke.

Unplugged everything and plugged in properly. Car started fine. Radio didn't work, but that was just a blown fuse. I now have everything back to normal EXCEPT for all of the power windows and the sunroof. All refuse to budge no matter what. Neither the center console switches nor the door switches in the rear work.

I've tried:

Locking/unlocking three times with the KEY

Disconnecting/reconnecting the battery with the key in the II position

Leaving the battery disconnected overnight and charging it to full

Anyone know what I might have fried?

Thanks!
Brennan

Post by **abscate** » 18 Aug 2015, 09:28

Time to get out the 1996 wiring diagram and look for commons on your windows and roof.

I think the good news is the aren't fuse, but are circuit breakered under the dash up front. These CBs reset automatically, and Im guessing 24 VDC has terminated their earthly existence and they have gone to CB heaven. Cheap ones from a PnP should restore your moving glass.

bnzelener · Post by **bnzelener** » 18 Aug 2015, 09:37

Thanks Abscate, looking for that circuit breaker now. Is it under the steering wheel, or hidden in the fuse box?

B

bnzelener · Post by **bnzelener** » 18 Aug 2015, 09:41

Got er'! Hidden under the plastic cover on the fusebox. Just need to test this - hopefully that's the source. Thanks Abscate!

bnzelener · Post by **bnzelener** » 18 Aug 2015, 09:50

Sad news. I flip-flopped the circuit breakers for the power seats and windows because the seats were working. Seats still work, windows still don't

What do I move onto next?

Post by **abscate** » 18 Aug 2015, 10:32

Nice diagnostic trick. Check for 12 VDC at the Circuit breaker at both connectors with the CB out. One will have 12 VDC.

From here, we need a diagram. Scour the inter webs for your model and year. We don't host them here by agreement with Volvo Legal, but users can post pictures they find without issues.

bnzelener · Post by **bnzelener** » 18 Aug 2015, 10:40

Good call! There is definitely a 12 VDC on the power seats CB. There is no 12VDC on the windows/sunroof CB. Looking for a diagram...

Post by **abscate** » 18 Aug 2015, 10:42

That is great news. Ill guess from here you have blown a fuse link wire between the battery and the main fuse box. Have a look at the wires going into the fuse box and look for bubbles, and melted plastic.

bnzelener · Post by **bnzelener** » 18 Aug 2015, 10:48

Diagrams found! [EDIT] - don't really need the diagrams if the problem is before the circuit breaker!

Okay, going to have to do some major digging. This is a project for tonight. I'll report back later

Thanks for all of the help!

B