Post Reply 
 
Thread Rating:
  • 1 Votes - 5 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Power Door Locks Not Working
01-22-2017, 09:19 PM
Post: #1
Cool Power Door Locks Not Working
All,

I am having vehicle door lock/ alarm issues. Everything in the vehicle is from factory except:
I have replaced all relays/fuses associated with Power mirror/door/lock/tcb in both the driver side door fuse box and under hood.
When I click arm on my key fob, I can hear everything click inside, but doors do not lock. Horn only beeps. If I open. Door, alarm does not go off. If I disarm via key fob, again everything clicks as it should, but doors do not unlock. Likewise, if I am sitting in the vehicle and press the unlock/lock button in either door arm rest, you hear it click, and nothing happens. Started sporadically doing it 3 weeks ago, which is why I replaced all relays and fuses, and now nada! Any help is appreciated!!!

2001 Chevy Tahoe LS
4x4
5.3 V8
4 door/rear door opens as a hatch
Find all posts by this user
Quote this message in a reply
01-23-2017, 01:01 AM
Post: #2
RE: Power Door Locks Not Working
Hard to figure out anything non-stock but it sounds like the relay for the door lock actuators is not doing it's job.... or... all the lock actuators have failed. My bet is on the lock actuator relay, or whatever triggers it.

Keep us posted on your progress.
Find all posts by this user
Quote this message in a reply
01-23-2017, 07:13 AM
Post: #3
RE: Power Door Locks Not Working
Another thing you can check is the mechanical function. In other words, how does the key work in the lock? I run older Chevy Trackers and I have similar problems with them. When I try the key in the door it will feel really stiff and hard to turn. I have to take the doors apart, lube and work everything until free, and put it all back together. It's unusual for all the doors to stick at once. But what I have also found is many times you don't realize that one door is sticking until the driver's door sticks. Then you notice other doors that aren't working.

Please keep us in the loop as to your progress.

Thanks for using the forum,
Garner

Interested in Mining? Look here: Coal Mining, PA
Visit this user's website Find all posts by this user
Quote this message in a reply
01-23-2017, 11:13 AM
Post: #4
RE: Power Door Locks Not Working
Now that the morning coffee has kicked in, I think Garner's point of view may be more likely than my original idea, especially if the outside temps have dropped a bit recently. The old grease on those linkage parts gets rather stiff with age and cold makes it worse. I have also seen those lock solenoids in the doors get weak as they get older so it may be time to go through the motions of cleaning and lubing then observe the results, starting with one door, to see where that takes you.
Find all posts by this user
Quote this message in a reply
01-27-2017, 01:53 AM (This post was last modified: 01-27-2017 01:56 AM by Neosymbionic.)
Post: #5
RE: Power Door Locks Not Working
Ok, well I know it's not the relays as they are all brand new. Thanks for the advice, guess I'll start with one door and lube all the parts, see if that helps, if so do all of them. If not guess it's on to the more expensive steps of actuators ?. Everything worked fine, as mentioned it all went to he t when the weather froze up. But it's warmed up again soooooo......I guess I'll see..... thanks every one! What type of lube should I use? Is there a preference?

(01-23-2017 01:01 AM)Rupe Wrote:  Hard to figure out anything non-stock but it sounds like the relay for the door lock actuators is not doing it's job.... or... all the lock actuators have failed. My bet is on the lock actuator relay, or whatever triggers it.

Keep us posted on your progress.

I replaced ALL relays associated with the doors/windows/mirrors

(01-23-2017 07:13 AM)Garner Wrote:  Another thing you can check is the mechanical function. In other words, how does the key work in the lock? I run older Chevy Trackers and I have similar problems with them. When I try the key in the door it will feel really stiff and hard to turn. I have to take the doors apart, lube and work everything until free, and put it all back together. It's unusual for all the doors to stick at once. But what I have also found is many times you don't realize that one door is sticking until the driver's door sticks. Then you notice other doors that aren't working.

Please keep us in the loop as to your progress.

Key works fine in both doors.
Find all posts by this user
Quote this message in a reply
01-27-2017, 06:44 AM
Post: #6
RE: Power Door Locks Not Working
I usually use a penetrating oil to start. It gets in and cleans out dirt and corrosion. Once everything is moving well I put some motor oil on because it has better lubrication. You can try the electric locks while the door is apart. You may need a mirror and flashlight to see all the moving parts. But seeing what's in there and what is happening (or NOT happening) may help you finish the job?

Thanks for keeping us in the loop. Please let us know what you find.

Thanks for using the forum,
Garner

Interested in Mining? Look here: Coal Mining, PA
Visit this user's website Find all posts by this user
Quote this message in a reply
01-27-2017, 10:45 AM
Post: #7
RE: Power Door Locks Not Working
I'm in the same frame of mind, using something like WD-40 to flush it clean first. Stuff some paper towels or a shop rag in the bottom of the door to catch what drools out as you work. DO NOT use carb cleaner or brake parts cleaner as they may attack the plastic parts of the latch!

When done use a heavy motor oil or even some spray lithium grease that will hang around. Maybe leave the rag in there for a half hour to catch drips while you start the next door.
Find all posts by this user
Quote this message in a reply
01-28-2017, 11:41 PM
Post: #8
RE: Power Door Locks Not Working
Well, I went out and greased everything, wd40 all locks, and everything moves manually like butter, still hear everything clicking like it should when I press buttons, but nothing happens. Could it really be possible that all 5 door actuators go out at once?????

:*(
Find all posts by this user
Quote this message in a reply
01-28-2017, 11:51 PM (This post was last modified: 01-29-2017 12:53 AM by Rupe.)
Post: #9
RE: Power Door Locks Not Working
Check the wires on the actuator with a test light to see if power (and ground) gets there. If not then work your way back toward the relay.... or possibly the fuse / breaker.

Edited to add: It may not be clear to you but a relay has two circuits. One works the relay coil, and the other is the power the relay is sending to whatever you are trying to control. (door solenoids in this case) What I am driving at is you may hear the coil clicking away but there's no power going through the contact side.... or for some reason it's not reaching the doors. (broken wire, bad fuse / circuit breaker) You can bench test a relay or try a direct substitute with another of the same part number. In the case of GM, many of the relays are the same # so you might swap out one from the headlights or the AC system just to prove things during a test.
Find all posts by this user
Quote this message in a reply
01-29-2017, 12:12 PM
Post: #10
RE: Power Door Locks Not Working
Did you try the locks while the door was apart so you could watch what was going on in the door? You should be able to see the actuator moving and hear it clicking. You should be able to see the linkage that it is supposed to move. The power locks usually have a separate linkage from the keyed one. You should move it manually while lubing it to be sure that it isn't sticking and it is moving freely.

If all of the actuators are bad I would suspect that the other doors failed over time and you only noticed the problem when the driver's door failed.

Please keep us updated.

Thanks for using the forum,
Garner

Interested in Mining? Look here: Coal Mining, PA
Visit this user's website Find all posts by this user
Quote this message in a reply
Post Reply 


Forum Jump:


User(s) browsing this thread: 2 Guest(s)