Power Locks not working - The 1947 - Present Chevrolet & GMC Truck Message Board Network

turner16 · 01-19-2012, 09:13 PM

I just got my 96 on the road and have some problems of course. This is the newest truck I've ever owned.

My power locks are dead, both switches both sides. Where do I start to troubleshoot this?

Legolas894 · 01-19-2012, 11:26 PM

Assuming no blown fuses, there's a black relay underneath in about the centre of the dash (I think it says Potter and Brumfield). See if that clicks when you push the buttons. Could be the buttons too but unlikely that both are bad.

**bwood** · 01-19-2012, 11:31 PM

I was also thinking that if the driver's side switch failed, it make both switches not work. I think I ran into this when I install my keyless entry.

turner16 · 01-22-2012, 02:43 AM

I think I may start with the switch. If that relay is located anywhere close to where it was on my 80 it will be lots of fun finding and changing it. Unless GM made removal able AC vent and but it right there? Now that would be nice.

mountie · 01-22-2012, 10:41 AM

When I changed out my driver's door lock switch, then both doors locked again.

$20 (LMC Parts) for each door switch. Use a putty knife to remove the switch, & just plug in the new one.

Legolas894 · 01-22-2012, 11:32 PM

Quote:

Originally Posted by turner16

I think I may start with the switch. If that relay is located anywhere close to where it was on my 80 it will be lots of fun finding and changing it. Unless GM made removal able AC vent and but it right there? Now that would be nice.

On m '98 Suburban, the relay was almost in the centre of the dash if you went up towards the radio. It's clipped to something else as I recall. My locks would sometime stay energized (in the unlock position), draining the battery.

mountie · 01-23-2012, 09:24 AM

the door switches are simple rocker switches. They can get stuck in a position, (inside, & behind the decorative outer switch cover your finger touches)...

Draining the battery.
My window switch used to be a "one-touch" up. Just touch the switch, remove your finger & the window would raise all the way up with no pressure from your finger.

BP68 · 01-27-2012, 12:11 AM

Check the fuses in the left IP fuse block on left side of dash. I am a gm tech and have seen the locks quit on these when the cig lighter fuse is blown. I never figured out how that ckt related to the locks, but it would be easy for you to check. I think it was labeled cig. Just check all the fuses and see if this helps.

mountie · 01-27-2012, 09:25 AM

My passenger door window & lock didn't work until I replaced those switches. Even the driver's side switch, for the passenger door didn't work until the passenger switches were changed.

(Thanks LMC for the parts)

bighaas79 · 01-29-2012, 01:17 AM

check for broken wires in the harness of the door jambs too.

baclay9 · 02-03-2012, 10:22 AM

My cig lighter fuse was blown and was keeping the door locks from working. I had to take it to a dealer because I couldn't figure it out. I would have never dreamed it was hooked up to the cig lighter fuse!
Posted via Mobile Device

turner16 · 02-03-2012, 04:40 PM

OMG my lighter won't work either!
Checking the fuse first thing

01-19-2012, 09:13 PM	#1
turner16 Registered User Join Date: Sep 2010 Location: Ajax, Ontario Posts: 214	Power Locks not working I just got my 96 on the road and have some problems of course. This is the newest truck I've ever owned. My power locks are dead, both switches both sides. Where do I start to troubleshoot this?

01-19-2012, 11:26 PM	#2
Legolas894 Chemist under the hood... Join Date: Apr 2009 Location: Fort Erie,ON, Canada Posts: 617	Re: Power Locks not working Assuming no blown fuses, there's a black relay underneath in about the centre of the dash (I think it says Potter and Brumfield). See if that clicks when you push the buttons. Could be the buttons too but unlikely that both are bad. __________________ Current fleet: 2013 GMC Sierra, 5.3L, 4x4 1988 GMC Sierra, 305, Auto 1984 Jeep Grand Wagoneer, 360 V8 1997 VW Cabrio, 2.0L 2017 Toyota Rav4, 2.5L Stuff I wish I still had: 2013 Toyota Matrix [RIP] 1967 GMC 910 Fleetside, 283 V8 [1st Love-SOLD] 1987 Jeep Cherokee Laredo 4X4, 4.0 I-6 [SOLD} 1994 Chevrolet Caprice Classic, 5.7LV8 [SOLD] 1995 Chevrolet Astro AWD, 4.3L V6 (RIP) 1998 Chevrolet Suburban 4x4, 5.7L V8 [SOLD]

01-19-2012, 11:31 PM	#3
bwood Registered User Join Date: Jan 2003 Location: Denison, Texas Posts: 1,919	Re: Power Locks not working I was also thinking that if the driver's side switch failed, it make both switches not work. I think I ran into this when I install my keyless entry. __________________ 1998 GMC Sierra SLE 1/2 ton 2WD 305 Vortec -Gibson Stainless Cat Back Swept Side -SS Wheels 2005 Honda CRF250R 2006 Honda CRF150F

01-22-2012, 02:43 AM	#4
turner16 Registered User Join Date: Sep 2010 Location: Ajax, Ontario Posts: 214	Re: Power Locks not working I think I may start with the switch. If that relay is located anywhere close to where it was on my 80 it will be lots of fun finding and changing it. Unless GM made removal able AC vent and but it right there? Now that would be nice.

01-22-2012, 10:41 AM	#5
mountie Registered User Join Date: Jun 2011 Location: Bradenton, Fla. Posts: 1,100	Re: Power Locks not working When I changed out my driver's door lock switch, then both doors locked again. $20 (LMC Parts) for each door switch. Use a putty knife to remove the switch, & just plug in the new one.

01-23-2012, 09:24 AM	#7
mountie Registered User Join Date: Jun 2011 Location: Bradenton, Fla. Posts: 1,100	Re: Power Locks not working the door switches are simple rocker switches. They can get stuck in a position, (inside, & behind the decorative outer switch cover your finger touches)... Draining the battery. My window switch used to be a "one-touch" up. Just touch the switch, remove your finger & the window would raise all the way up with no pressure from your finger.

01-27-2012, 12:11 AM	#8
BP68 Registered User Join Date: Jun 2006 Location: Olive Branch, MS Posts: 824	Re: Power Locks not working Check the fuses in the left IP fuse block on left side of dash. I am a gm tech and have seen the locks quit on these when the cig lighter fuse is blown. I never figured out how that ckt related to the locks, but it would be easy for you to check. I think it was labeled cig. Just check all the fuses and see if this helps. __________________ 68 C10 Shortbed Fleetside 06 Chevy Ext Cab Fleetside 03 Grand Prix GTP My build thread http://67-72chevytrucks.com/vboard/s...d.php?t=269999

01-27-2012, 09:25 AM	#9
mountie Registered User Join Date: Jun 2011 Location: Bradenton, Fla. Posts: 1,100	Re: Power Locks not working My passenger door window & lock didn't work until I replaced those switches. Even the driver's side switch, for the passenger door didn't work until the passenger switches were changed. (Thanks LMC for the parts)

01-29-2012, 01:17 AM	#10
bighaas79 Registered User Join Date: Nov 2008 Location: manly iowa Posts: 390	Re: Power Locks not working check for broken wires in the harness of the door jambs too.

02-03-2012, 10:22 AM	#11
baclay9 Registered User Join Date: Apr 2010 Location: Newcastle, OK Posts: 1,344	Re: Power Locks not working My cig lighter fuse was blown and was keeping the door locks from working. I had to take it to a dealer because I couldn't figure it out. I would have never dreamed it was hooked up to the cig lighter fuse! Posted via Mobile Device

02-03-2012, 04:40 PM	#12
turner16 Registered User Join Date: Sep 2010 Location: Ajax, Ontario Posts: 214	Re: Power Locks not working OMG my lighter won't work either! Checking the fuse first thing



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