Volvo 850 Made from 1993 to 1997, this Volvo line was available in both a wagon and a sedan, both with were graced with several trim levels.

Immobilized keeps going off

Old 04-26-2018, 09:03 AM
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Join Date: Apr 2018
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Default Immobilized keeps going off

I recently got a Ď96 850 turbo as a first car to fix up with my dad. The body and engine are in very good shape but it needs some electrical work. First and foremost, it needed a battery. I picked one up late last night and installed it. I then tried to open the car door and the immobilizer went off. We canít figure out what the issue is. This is probably just a rookie mistake, but does anyone have any advice?
Old 04-26-2018, 01:48 PM
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Join Date: May 2012
Location: Kingsport, TN
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I have not had any trouble with them, but I would think there are some wiring problems that could cause trouble. Like any car, if you lock the car in "security" mode, like with a key, then you reach through the window and unlock it, you put the car in full-blown stolen mode. Any car will do that. So if the wiring that recognizes the key turned is damaged, you'd never work through that. Like I said, though, I have not had any trouble with them.

Normally if you "steal" the car you can unsteal it by locking and unlocking the door several times with a key.

Some 850's had a key fob clicker that had extra features and thus on a 20 year old car causes extra problems, especially if you lock the car with it and then lose it. Do you have a key fob controller?

Also, the 850's are a little funny in that all the doors have to be locked or unlocked together, which is odd. When the battery is dead, this is no longer true, and the system gets in a state that it's not normally in. If the door actuators quit working, the car can put itself in the wrong state and it could be self-inflicted. I have never really had to work on that either, but it seems to me that the car monitors whether it locked properly or not.

Last edited by firebirdparts; 04-26-2018 at 01:51 PM.
Old 04-26-2018, 08:36 PM
Join Date: Mar 2012
Location: Ridgefield, CT
Posts: 4,782

I believe the immobilizer also has a battery in it - wondering if that needed to recharge when the new baattery was put in. Did you try locking/unlocking the doors 5x with the fob to reset it?
Old 04-26-2018, 08:39 PM
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All I had to do was lock and unlock the door a few times... I knew it was going to be some rookie mistake. Thank you for the help!
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