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Power door locks

Tiny
COLEMAN.334
  • MEMBER
  • 2000 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 130,000 MILES
I blew a fuse and all the power locks stopped working. I replaced the fuse and now all works good except my passenger door will unlock but not lock. I replaced the door lock assembly which didn't fix a thing. I am getting power to the door lock but nothing happens. I can't even hear the actuator try to lock the door like I can when it locks. It doesn't matter where I try to lock the door, it simply won't auto lock. Any help would be great!
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Sunday, October 25th, 2009 AT 9:08 PM

10 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Hi
Maybe the lock fuse for pass side located instrument fuse box # 22 15 amp


https://www.2carpros.com/forum/automotive_pictures/198357_Graphic_210.jpg


Let me know
Thanks for donate
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Monday, October 26th, 2009 AT 10:20 AM
Tiny
COLEMAN.334
  • MEMBER
  • 2 POSTS
All the fuses are just fine. I even pulled them all out and put them on a tester just to be sure. Any other thoughts? What about a faulty BCM?
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Monday, October 26th, 2009 AT 7:22 PM
Tiny
QUAGMIRE86
  • MECHANIC
  • 98 POSTS
With the passenger side door, the door lock actuator has two relays (according to memory of schematic). One relay will lock and a seperate relay will unlock. I will have to check my book and get back to you.
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Monday, October 26th, 2009 AT 9:46 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
In same fuse box switch out lock relay with unlock if it locks then relay faulty
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Tuesday, October 27th, 2009 AT 8:11 AM
Tiny
QUAGMIRE86
  • MECHANIC
  • 98 POSTS
OK, you said that you replaced the fuse. According to the schematic that I have in front of me, there are four (4) fuses and three (3) relays associated with the power lock system.

1). 20A DR LOCK fuse located left fuse box (side of dash.
2). 3A MIR/LOCK fuse located in left fuse box.
3). 15A LOCK fuse located in left fuse box.
4). 15A UNLOCK fuse located in left fuse box.
5). DOOR LOCK RELAY in left fuse box.
6). DRIVER DOOR UNLOCK RELAY in left fuse box.
7). DOOR LOCK RELAY in left fuse box.

Since the door will unlock, but won't lock, it would seem to be a problem with the GRAY/BLK wire at the lock actuator. Put a test light on the 15 amp LOCK fuse and press the lock switch. If you are not getting power at both sides of the fuse, then the relay is bad. If you are getting power at only one side of the fuse, that fuse is bad.
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Wednesday, October 28th, 2009 AT 5:28 AM
Tiny
MENDEZJUNIOR
  • MEMBER
  • 2 POSTS
I’m having the exact same problem but the fuse and relays are good. I’m getting power but the passenger door still won’t lock.
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Wednesday, May 1st, 2019 AT 2:48 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,320 POSTS
Hello,

It sounds like the door lock actuator has gone out but to be sure here is a guide to show you how to check for power at the lock actuator and how to replace it in the diagrams below.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

See if the actuator gets power when the switch is activated.
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Thursday, May 2nd, 2019 AT 1:51 PM
Tiny
MENDEZJUNIOR
  • MEMBER
  • 2 POSTS
I replaced the actuator and it still did the same thing. I then connected it to the other side to see if the new actuator was defective and it wasn’t, it locked and unlocked how it should.
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Monday, May 6th, 2019 AT 12:31 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,320 POSTS
Okay, I would check the wiring because it sounds like one of them is broken or it has a bad connection use the door lock wiring diagrams from above and this guide to check the connections.

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (below). Please let us know what happens.
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Monday, May 6th, 2019 AT 2:35 PM
Tiny
BRATOR
  • MEMBER
  • 1 POST
Blown fuse : A fuse is a low resistance resistor that creates overcurrent protection. Essentially, the fuse takes a large amount of electrical current, and converts it into a smaller, more manageable amount of current that the door lock actuator can have. It’s not rare for fuses to blow, and when they do, electrical current will stop running to the door lock actuator, rendering the power door lock system useless.
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Wednesday, May 29th, 2019 AT 7:42 AM

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