1999 Tahoe (old style) power door lock problem

[SunlitComet]

Fused circuit for switches might be malfunctioning.

 

[rbritton72]

I'm having the same problem as well. When I press on the lock button the two back doors lock but the two front doors wont. I took off the driver door panel and looked at the actuator for the locks when I pressed it and it was kinda half ass working.... I pressed down on the rod that was connected to the actuator and it worked better but I can't just take off the panel every time I want to use the lock button. I can push down on the lock itself but it gets annoying when I have to manually lock everything up every time I want to lock it up.

Do you think it could be a wiring problem since it is both the front doors? what else could it be?

I have the same exact problem...so i tried the passenger switch thinking I had a bad switch...well turns out its the driver side switch in the door...That is the main switch so if u change it out to a new one it should solve everyones problems..

 

[slinky18]

I have a little bit different of a problem with the power locks on my 99 Yukon. When they car has been sitting for a while with no activity the power locks work fine. Whether it be using the switch on the door or the key fob. However, if the locks are locked and unlocked more than a couple times the front two doors as well as the very back door quit locking and unlocking. The front two door locks will move slightly up or down depending on whether they are trying to lock or unlock. After letting them rest for a while (haven't tested any closer together than a couple hours) the locks will work fine again for one to three unlock cycles before stopping again.

Is this a sign that the actuators are going out or is there something else this could be?

 

[SunlitComet]

if all three are doing the exact same thing then i would be concerned with the control relay first before replacing the actuators. it is possible the contacts of the relay are breaking down a bit.

 

[slinky18]

Just to be clear. The front driver and passenger doors are doing as I described as well as the very back door. The rear driver and passenger side doors are working fine. Just wanted to make sure this being a 4 door and not a 2 door wouldn't change a possible diagnosis.

Thanks again for all the info.

 

[SunlitComet]

well you failed to mention it was a four door before. in that case replace your actuators and while in there clean and lube the latch and handle parts. they are probably gonna need it as well.

 

[slinky18]

Yeah I realized I didn't make that clear when I reread my post. Could you recommend a place to get the actuators from online? Should I get aftermarket or OEM? Also, are there any web sites that have diagrams and all for this repair/replacement? You may be able to tell that I am a novice when it comes to automotive repairs.

 

[SunlitComet]

gm 22062740 for rear barn door setup.
gm 22071946 for left front door.
gm 22071946 for right front door.
gm 11561257 pop rivets. two will be needed to do the barn door unit. and a big pop riveter.
unsure about the fronts but you will see.
buy these gm/acdelco parts. DO NOT BUY DORMAN OR SIMILAR BRANDS. OEM ONLY ON THESE PARTS.

---------- Post added at 04:29 PM ---------- Previous post was at 04:19 PM ----------

Door Lock Schematics: PWR ACCY Circuit Breaker, Door Lock Relay, Cargo Door Contactors, Door Lock Motors, G202

---------- Post added at 04:29 PM ---------- Previous post was at 04:29 PM ----------

Door Lock Schematics: CIG LTR Fuse, Door Lock Control Module, Rear Door Jamb Switch, Rear Door Lock Switch, G400

---------- Post added at 04:30 PM ---------- Previous post was at 04:29 PM ----------

Service and Repair

Removal Procedure

1. Disconnect the negative battery cable.
2. Remove the door trim panel. See: Doors, Hood and Trunk\Doors
3. Remove the door water deflector.
4. Remove the door lock actuator.
5. Disconnect the electrical connector.

Installation Procedure

1. Connect the electrical connector.
2. Install the door lock actuator.
3. Install the door water deflector.
4. Install the door trim panel.
5. Connect the negative battery cable.

 

[ChoochCharlie]

I'm working on the same kind of issue with my Suburban.
My wife calls it the Mystery Door. Which door won't be locked when they come back to the truck. Usually the right rear, but not always.

I did find I have a short in the wiring to the drivers door. The lock button does nothing until the door is almost closed. I also don't have power to the speaker in that door.

In the past, on another vehicle I found my power window and door lock issue was a lack of solid ground connections. I went around and cleaned the connections and replaced some worn ground straps and the problem was solved.

 

[saif najd]

I have something similar but I wont do it now!