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Is it from the inside or outside, the inside have child locks to keep them from being opened from the inside, open them from the outside, inside the the door where the latch is, is a selector for the child locks

AnswerIt can be one of three things.

1) If there are child locks, it could be that, but the doors would open from the outside.

2) The latch is broken. I have the same problem on my 1989 Bonneville and I know a place that will fix it for roughly $90 per door.

3) The rod is snapped or broken.

AnswerThese cars typically suffer from this. It is not usually caused by the power locks, if you can hear the lock mechanism clicking when you press the button, it is most likely fine. The root of the problem is that GM started to use a vegetable oil based lubricant on the lock mechanism around this time to replace the previously used whale oil based lubricant. Over time, with lack of use, this dries into a sticky residue and does not allow the lock to disengage. Usually only the driver's door will still work, since it gets the most use. If you push in the lock button on the exterior of the door and it feels like there is "nothing" behind it, this is likely your problem. To simply get your doors open try this: Have someone click the power lock open and closed in rapid succession while you hit (hard) with the side of your fist on the top of the door handle (exterior of car) several times. Make sure they stop clicking the lock with it in the open position, then try the door, this will often free the stuck lock. The only real cure for this is to remove the door panel and lock, then clean and re-lubricate the lock. Another tip is NEVER push in the exterior door button when the car is locked, it will just about guarantee that the lock will stick.
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Q: Why won't the back doors of a 1991 Bonneville SSE open?
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