Question about 1994 Pontiac Grand Am

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94 Grand Am Power Lock - front drivers side door not working

All the other door locks work, but the drivers side front door does not lock or unlock with the switch.
I CAN hear the noise in that door indicating that it's trying, so I'm guessing that the switch works, but the actual lock does not move.

I'm wondering if the rod is out of location with the switch or something? I really don't know how the rod is hooked up to it or anything, help would be very appreciated.

Thank you,
Mark

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  • Mark Rakes
    Mark Rakes Dec 07, 2008

    The door panel is actually still off because I just replaced the power window motor, I just want to get this lock fixed before putting the door panel back on. But I don't know how to fix the problem. How does the rod hook up to the mechanism?

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Sounds like you are right. If it has ever been unlocked with a slim jim, it could have pulled it loose. You have to remove the door panel to get to it.

Posted on Dec 06, 2008

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Why does my 2004 Chevy Silverado lock and unlock while in drive? When turned off and no keys in ignition the drivers door will unlock on its own a short time later.


Gremlins ! HA HA HA sorry ! First off a little bit on how they work an what all is involved in making them work ! There are a few control modules in the mix , switches ,relays etc...
Door Lock System Components
The power door lock system consists of the following components:
?€¢
The driver door module (DDM)

?€¢
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?€¢
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The driver information center (DIC)

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The rear door lock switch

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The door lock relay

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The door unlock relay

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The liftgate lock relay--utility vehicles with liftgate only

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The reversible door lock actuators in each of the doors and liftgate

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LOCKS 20A fuse (rear lock/unlock relay supply voltage)

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ECC 10A fuse (liftgate lock relay supply voltage)

Door Lock System Controls
The power door lock system can be controlled by any of the following:
?€¢
A power door lock or unlock switch activation

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An airbag deployment

The front power door lock switches are integral components of the driver door module (DDM) and passenger door module (PDM). The switches are two position normally open rocker switches. When placed in either the lock or unlock positions, the switches provide a direct input to the DDM or PDM. The DDM or PDM monitors these inputs and sends a Class 2 message indicating a change in the switch's respective position. Modules which activate the power door lock motors receive the Class 2 message and activate the motor in the appropriate direction to lock or unlock the vehicle's doors and liftgate. The rear door lock switch provides a lock and unlock signal to the body control module (BCM). The BCM upon receipt of a lock or unlock signal will control the rear door lock relays and also send a Class 2 message to the DDM and PDM to perform the appropriate function.
The modules which activate the power lock motors are:
?€¢
The DDM (driver door lock actuator).

?€¢
The PDM (passenger front door lock actuator).

?€¢
The BCM (both rear door lock actuators and cargo door/liftgate).
The DDM and PDM are directly connected to the respective door lock actuator through the door lock motor lock and unlock circuits. Once a door lock or unlock request has been received, the module will supply battery voltage to one side of the actuator and ground the other causing the doors to lock or unlock.
The rear passenger and cargo doors differ slightly in that they use lock and unlock relays. The relays supply and coil sides receive a constant voltage through the battery voltage supply circuit. The normally closed contacts are connected to ground and the control side is connected to the BCM. Once a door lock or unlock request has been received by the BCM, the BCM will ground the control side of the appropriate relay. This energizes the relay and allows voltage to be applied to either the door lock motor lock or unlock circuits. since the other side of the door lock actuator is connected to the normally closed contacts of the opposing relay to ground, the doors lock or unlock.
The first place to start is have a factory or equivalent scan tool hooked up , one that can read BCM DTC'S - diagnostic trouble codes ! This could lead to a fix faster ! Watch these three videos !
Door Locks Go Crazy 1

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I have a 2000 Jeep Grand Cherokee...the electric windows quit working...don't have power to either driver or passenger windows, only power to passenger door lock, what else do I need to check?


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http://technoanswers.blogspot.com/2012/01/ford-f-350-crew-cab-drivers-side-front.html

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http://howtobyme.blogspot.com/2011/11/all-power-door-locks-not-working-on_14.html

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http://howtobyme.blogspot.com/2011/11/repairing-car-door-lock-actuator.html
---------------
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http://howtobyme.blogspot.com/2011/11/how-to-access-car-door-panel.html

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Vehicle door panel components?

http://howtobyme.blogspot.com/2011/11/vehicle-door-panel-components.html

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http://schematicsdiagram.blogspot.com/2011/12/ford-truck-door-will-not-close.html

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http://schematicsdiagram.blogspot.com/2011/12/where-is-cars-door-control-module.html

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http://schematicsdiagram.blogspot.com/2011/12/power-door-locks-not-working.html

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http://repairhelpcenter.blogspot.in/2012/02/front-door-dis-assembly-diagram-for.html

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http://repairhelpcenter.blogspot.in/2012/02/rear-door-dis-assembly-diagram-for.html

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http://repairhelpcenter.blogspot.in/2012/02/how-to-test-power-door-locks.html

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This will help.

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First, I'd recommend buying (or borrowing from the library) a Chilton or Haynes Manual to help finding the parts and how to access them. They'll save you a lot of time and headaches.

Then I'd try replacing the door lock motor. The motor itself should be just behind the inside door panel. Many times these motors, after years of wear and tear, break the teeth off the internal gears, causing a loud grinding/whirring noise but not allowing the doors to fully lock or even lock at all.

You can either buy a new motor from an auto parts store, but I've found that by checking with the local junk yard turns up some really good deals. Try to find a car that is the same make and model but maybe a newer year, bring the old motor with you, and make sure they look exactly the same down to the mounting holes.

I hope I could help you fix this issue. Good luck and don't forget to rate! Thank you!

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