Question about 1992 Pontiac Firebird

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My headlights,power mirrors, and trunk pulldown dont work intermittently . sometimes they will work after hitting a bump. The other day I drove through a water puddle and they all started working fine

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This is a hard one because you can't fix whats not broke. But on this intermittent problem the first place you want to look is the grounds under the hood. This includes the negative battery cable. Be sure to check both ends . Check as many as you can find, you are looking for loose or dirty connections. You need to check this because hitting bumps can change weather or not they work. This can be time consuming and boring but it has to be done. This is why mechanics that do electrical work charge so much its for time and what they know to save them selves time to find the problem and repair them. Good luck.

Posted on Sep 26, 2009

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Posted on Jan 02, 2017

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All day it doesn;t matter when, my acadias trunk will unlatch and set off all my interior lights. if i hit a bump sometimes it closes all by itself? sometimes it opens when bymp hits? what is going on? ...


Controlled by a control module ,BCM , liftgate module etc.... Probably a switch input is bad . You don't say what year ,but doesn't matter .your best bet , take it to a qualified repair shop.

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Do you mean the pulldown is not working, or the trunk lid latch is not connecting to the pulldown assembly when you try to close the trunk?

This latter case typically happens when someone slams the trunk lid down several times not realizing there is a pulldown system and thinking slamming it will make it close (this often breaks something). Check the latch on the trunk lid - if it's in the closed position, use the key to try to move it to the open position and try gently closing the lid again.

If not, there is also a switch on the pulldown assembly that starts the pulldown motor when it is depressed by the closing trunk lid - you can also check this to make sure it's working. Otherwise, either the latch or the pulldown assembly has been bent/broken.

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This is an intermittant electrical problem. Check to make sure the socket is clean and properly grounded. Then get a 12 volt test light and start tracing the wires going to the lamp, it sounds like you have an open circuit somewhere and when you hit bumps sometimes it will close the circuit and other times it will open it. Check for damaged wires and such, it is probably an open somewhere in the trunk. It could be the lamp assembly itself as well.

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1 Answer

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If you have automatic pulldown watch your fingers. If you hear the pulldown working the motor is good. If not the striker needs adjusting or the motor is bad.
Check the edges of your weatherstripping and if the hinges are rubbing inside the trunk.

If you have a manual setup look under the lid to see if the striker is loose and adjust. Sometimes the part in the trunk is the adjustable side.

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i think you gotto check your battery

all the best

Happy to help
Have a nice day!
tc

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