power lock problems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

thehitchmaster · 02-03-2010, 08:48 PM

I have a 83 GMC with power locks. when you hit the unlock button they unlock,but will not lock. any help on this issue would be greatly appreciated.

glock35ipsc · 02-03-2010, 08:56 PM

Could be the lock relay, it's mounted above the gas pedal. But I would start at the drivers door switch and work back.

Check all the connections at the switch.

Check the connector under the dash near the kick panel running from the door to the inside of the cab. Wiggle that harness while trying to lock it. My windows were working intermittently for a while, and that's where I found my problem.

thehitchmaster · 02-03-2010, 09:00 PM

ok. yeah maybe its something simple like that.

glock35ipsc · 02-03-2010, 09:03 PM

Always check the simple things first.....

thehitchmaster · 02-03-2010, 09:05 PM

lol. yeah i always head for the most complicated. I will check all my connections when i get to the shop in the morn. thanks glock

**old Rusty C10** · 02-03-2010, 09:49 PM

9/10 of the time its the wiring at the switch isnt making good contact on GM power windows and locks of this genre

*Stitch* · 02-03-2010, 10:00 PM

Mine don't work with either switch lock or unlock...how would I go about troubleshooting it...or should I just replace the relay...how much you think something like that costs...thanks guys...

Chuck.

thehitchmaster · 02-03-2010, 10:05 PM

thanks for all the suggestions. I will check behind the switch first.

glock35ipsc · 02-03-2010, 10:19 PM

Chuck - I'm not sure what the relays would cost. Check you r fuse block, not only for the fuse but I believe the main power wire plugs into the fuse block as well. Start were the power starts, then check the relay. It's above the gas pedal, closest to the firewall, and the right side of the bracket.

Also, both of you, sometimes the wires that run between the door and the door jam can break, so that's a possibility too.

thehitchmaster · 02-03-2010, 10:20 PM

I think the relay is pretty expensive. I also thought of just replacing it to see if it would fix the problem, but im going inspect all of the connections first like suggested.

TLoz · 02-03-2010, 11:17 PM

Hitchmaster,
I've got a relay and switches/wiring if you need them. Tom

thehitchmaster · 02-03-2010, 11:32 PM

awesome!! If I end up needing any parts, i'll for sure be giving you a shout.

*Stitch* · 02-04-2010, 12:37 AM

I have a spare relay out of my dad's truck I'm parting out now that I think of it...can someone post a pic of the fuse box and circle the relay I need to replace...thanks guys

Mr.Scary · 02-04-2010, 10:39 AM

x2 on wut fat hoe said

72 CustomCamper · 02-04-2010, 11:07 AM

I'd check the switches first. Mine quit working and all I did was take the switches apart and clean the contacts. They work great now...

Chuck

Damien · 02-04-2010, 11:35 AM

I have the opposite problem on my drivers door. I hit the lock button and it will not unlock. The knob tries to move, so it isn't the switch. I couldn't pull the knob up either. I ended up using a "jimmy stick" to unlock it and haven't tried to lock it again.

**old Rusty C10** · 02-04-2010, 11:47 AM

damien yours sounds like a bad motor or whatever they call the actual thing that pushes up and down the button for the lock

*Stitch* · 02-05-2010, 02:24 AM

here's a pic...so which one is the door lock relay...is it the blue-greenish one in the lower right corner or the silver square box above the blue-greenish one...
thanks guys...

Chuck.

tucsonjwt · 02-05-2010, 03:46 AM

I went through the whole power door lock issue on my 83 C20 before I realized that it was just rust on the lock rod assembly. Try pulling off the inside door panel and spray some WD40 on the lock rod and hardware, then work the switch back and forth. Might save you actuator and switch costs. The switch harness connectors do work loose, so try wiggling, removing/reinstalling the connections. Good luck.

BLE 'BURBAN · 02-05-2010, 04:41 AM

Quote:

Originally Posted by Fat Hoe

here's a pic...so which one is the door lock relay...is it the blue-greenish one in the lower right corner or the silver square box above the blue-greenish one...
thanks guys...

Chuck.

Not even close fat hoe. The door lock relay is mounted on your accelerator pedal bracket at the top. It has to be grounded in order to allow the door locks to function properly. And that is done by way of the screw that mounts it to the pedal bracket.
That silver rectangular one is the 30amp circuit breaker for your power windows

83GMCK2500 · 02-05-2010, 04:54 AM

I do believe the part you are looking for resembles this guy:

Other pics available if that doesn't do it.

*Stitch* · 02-05-2010, 07:50 AM

thanks...I have a spare one of those also...gonna try it this weekend and see what I get...thanks guys...

glock35ipsc · 02-05-2010, 10:19 AM

BTW Fat Hoe - The greenish round one on the fuse block is the flasher.

I mentioned this earlier:

Quote:

Originally Posted by glock35ipsc

check the relay. It's above the gas pedal, closest to the firewall, and the right side of the bracket.

*Stitch* · 02-05-2010, 08:50 PM

I misread...thought you said right side of the fuse block...lol

Fastest32 · 02-05-2010, 08:58 PM

does it also do that if you use the passenger switch? If the pass side works them fine then its gotta be the switch. they're less than ten bucks

02-03-2010, 08:48 PM	#1
thehitchmaster Registered User Join Date: Nov 2009 Location: Foley, AL Posts: 94	power lock problems I have a 83 GMC with power locks. when you hit the unlock button they unlock,but will not lock. any help on this issue would be greatly appreciated. __________________ http://www.gulftruckinc.com

02-03-2010, 08:56 PM	#2
glock35ipsc Next project: 1970 K10 Join Date: Feb 2004 Location: Fort Collins, Colo 80524 Posts: 6,685	Re: power lock problems Could be the lock relay, it's mounted above the gas pedal. But I would start at the drivers door switch and work back. Check all the connections at the switch. Check the connector under the dash near the kick panel running from the door to the inside of the cab. Wiggle that harness while trying to lock it. My windows were working intermittently for a while, and that's where I found my problem. __________________ *Bob* 1970 Chevy K10 LWB "Goldie" 350/TH350 *next project!!* 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE

02-03-2010, 09:00 PM	#3
thehitchmaster Registered User Join Date: Nov 2009 Location: Foley, AL Posts: 94	Re: power lock problems ok. yeah maybe its something simple like that. __________________ http://www.gulftruckinc.com

02-03-2010, 09:03 PM	#4
glock35ipsc Next project: 1970 K10 Join Date: Feb 2004 Location: Fort Collins, Colo 80524 Posts: 6,685	Re: power lock problems Always check the simple things first..... __________________ *Bob* 1970 Chevy K10 LWB "Goldie" 350/TH350 *next project!!* 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE

02-03-2010, 09:05 PM	#5
thehitchmaster Registered User Join Date: Nov 2009 Location: Foley, AL Posts: 94	Re: power lock problems lol. yeah i always head for the most complicated. I will check all my connections when i get to the shop in the morn. thanks glock __________________ http://www.gulftruckinc.com

02-03-2010, 09:49 PM	#6
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,286	Re: power lock problems 9/10 of the time its the wiring at the switch isnt making good contact on GM power windows and locks of this genre __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

02-03-2010, 10:00 PM	#7
Stitch Account Suspended Join Date: Jul 2008 Location: Where I come from, it's cornbread and chicken... Posts: 3,122	Re: power lock problems Mine don't work with either switch lock or unlock...how would I go about troubleshooting it...or should I just replace the relay...how much you think something like that costs...thanks guys... Chuck.

02-03-2010, 10:05 PM	#8
thehitchmaster Registered User Join Date: Nov 2009 Location: Foley, AL Posts: 94	Re: power lock problems thanks for all the suggestions. I will check behind the switch first. __________________ http://www.gulftruckinc.com

02-03-2010, 10:19 PM	#9
glock35ipsc Next project: 1970 K10 Join Date: Feb 2004 Location: Fort Collins, Colo 80524 Posts: 6,685	Re: power lock problems Chuck - I'm not sure what the relays would cost. Check you r fuse block, not only for the fuse but I believe the main power wire plugs into the fuse block as well. Start were the power starts, then check the relay. It's above the gas pedal, closest to the firewall, and the right side of the bracket. Also, both of you, sometimes the wires that run between the door and the door jam can break, so that's a possibility too. __________________ *Bob* 1970 Chevy K10 LWB "Goldie" 350/TH350 *next project!!* 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE

02-03-2010, 10:20 PM	#10
thehitchmaster Registered User Join Date: Nov 2009 Location: Foley, AL Posts: 94	Re: power lock problems I think the relay is pretty expensive. I also thought of just replacing it to see if it would fix the problem, but im going inspect all of the connections first like suggested. __________________ http://www.gulftruckinc.com

02-03-2010, 11:17 PM	#11
TLoz Registered User Join Date: Dec 2003 Location: Indy Posts: 326	Re: power lock problems Hitchmaster, I've got a relay and switches/wiring if you need them. Tom

02-03-2010, 11:32 PM	#12
thehitchmaster Registered User Join Date: Nov 2009 Location: Foley, AL Posts: 94	Re: power lock problems awesome!! If I end up needing any parts, i'll for sure be giving you a shout. __________________ http://www.gulftruckinc.com

02-04-2010, 12:37 AM	#13
Stitch Account Suspended Join Date: Jul 2008 Location: Where I come from, it's cornbread and chicken... Posts: 3,122	Re: power lock problems I have a spare relay out of my dad's truck I'm parting out now that I think of it...can someone post a pic of the fuse box and circle the relay I need to replace...thanks guys

02-04-2010, 10:39 AM	#14
Mr.Scary Project Optimus Prime Join Date: Jan 2009 Location: Dallas, TX Posts: 346	Re: power lock problems x2 on wut fat hoe said __________________ 84 SWB work in progress 89 burb 1500 (parts pig) LOL 08 ford focus (I know, I know) Wifes car "I said it b4 and i'll say it agian wiring is my worst enemy":devil:

02-04-2010, 11:07 AM	#15
72 CustomCamper huh ??? Join Date: Nov 2002 Location: Fredericksburg,Va. Posts: 3,369	Re: power lock problems I'd check the switches first. Mine quit working and all I did was take the switches apart and clean the contacts. They work great now... Chuck __________________ 90 Blazer Silverado 350w/ 700R4 and 32" Kelly's "I am a bomb technician. If you see me running try to keep up!"



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02-04-2010, 11:35 AM	#16
Damien Registered User Join Date: Mar 2007 Location: Farmington, MN Posts: 928	Re: power lock problems I have the opposite problem on my drivers door. I hit the lock button and it will not unlock. The knob tries to move, so it isn't the switch. I couldn't pull the knob up either. I ended up using a "jimmy stick" to unlock it and haven't tried to lock it again. __________________ I can still count my vehicles on two... wait three hands. Last edited by Damien; 02-04-2010 at 11:36 AM.

02-04-2010, 11:47 AM	#17
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,286	Re: power lock problems damien yours sounds like a bad motor or whatever they call the actual thing that pushes up and down the button for the lock __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

02-05-2010, 02:24 AM	#18
Stitch Account Suspended Join Date: Jul 2008 Location: Where I come from, it's cornbread and chicken... Posts: 3,122	Re: power lock problems here's a pic...so which one is the door lock relay...is it the blue-greenish one in the lower right corner or the silver square box above the blue-greenish one... thanks guys... Chuck. Attached Images Last edited by Stitch; 02-05-2010 at 02:25 AM.

02-05-2010, 03:46 AM	#19
tucsonjwt Registered User Join Date: Jul 2007 Location: Tucson, AZ Posts: 3,188	Re: power lock problems I went through the whole power door lock issue on my 83 C20 before I realized that it was just rust on the lock rod assembly. Try pulling off the inside door panel and spray some WD40 on the lock rod and hardware, then work the switch back and forth. Might save you actuator and switch costs. The switch harness connectors do work loose, so try wiggling, removing/reinstalling the connections. Good luck.

02-05-2010, 04:54 AM	#21
83GMCK2500 Registered User Join Date: Sep 2009 Location: Beaverton, OR from WA State Posts: 1,515	Re: power lock problems I do believe the part you are looking for resembles this guy: Other pics available if that doesn't do it. Attached Images Last edited by 83GMCK2500; 02-05-2010 at 04:54 AM.

02-05-2010, 07:50 AM	#22
Stitch Account Suspended Join Date: Jul 2008 Location: Where I come from, it's cornbread and chicken... Posts: 3,122	Re: power lock problems thanks...I have a spare one of those also...gonna try it this weekend and see what I get...thanks guys...

02-05-2010, 08:50 PM	#24
Stitch Account Suspended Join Date: Jul 2008 Location: Where I come from, it's cornbread and chicken... Posts: 3,122	Re: power lock problems I misread...thought you said right side of the fuse block...lol

02-05-2010, 08:58 PM	#25
Fastest32 Registered User Join Date: Nov 2009 Location: Austin Texas Posts: 370	Re: power lock problems does it also do that if you use the passenger switch? If the pass side works them fine then its gotta be the switch. they're less than ten bucks

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