Help 2002 gmc sierra 2500hd with a 6.0

[Desperado73096]

Just bought a truck the electric locks won't work with the button or key fob I can hear the relays clicked but no lock action and everytime I open the doors the alarm automatically arms it's self so if I don't disarm it with the key fob before opening the door the alarm goes off

[Jsdirt]

Try swapping around that door lock relay for another identical one in the underhood fuse box. The relay can still be bad even though it "clicks" , by not completing the power circuit.

[Desperado73096]

Did that plus bought new ones and put in

[Desperado73096]

I do know on some vehicles the alarm system will make it were the locks won't work if it's armed so not sure if that's causing them not to work or not all the dealerships in my area have no clue why it's doing that or why the alarm is arming it's self everytime I open a door

[Swimmer8366]

They had tons of problems with ignition switches going bad causing problems with theft systems could be the problem.....just a hunch though.

 

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[Desperado73096]

I will definitely look in to that wonder if there's a way to test them to see if it's faulty

[Doug_Scott]

If you double push the unlock button does it unlock the passenger door? Take the door panel off the drivers door and see if the solenoid is operating correctly.

[Desperado73096]

When I hit the unlock button on the door nothing happens I just hear the relay click when I hit the lock button nothing happens and I don't hear no relays. If I take the relay out then back in the driver side door will lock but no other doors

[Swimmer8366]

How's the hunt for your security problem??

 

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[Desperado73096]

Still nothing took it to the chevy dealer ship in town and charged me to look at for a few days and tell me they have no clue

[Swimmer8366]

You find a way to check the ignition switch??

 

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I'll do some research this weekend and see what I can find for you

 

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[Swimmer8366]

 

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[Swimmer8366]

Check out your lock actuators that could be where your problem is.

 

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[Desperado73096]

Gm dealer put new ignition switch in to fix my tranny problem but everything is still the same messed up lol door actuator is my next try

[Jsdirt]

Since you said the driver's door started working when you pulled the relay, I'm thinking you could have some pin issues in the fuse block. Could be corroded, spread open from jamming test leads in, or no longer attached to the fuse block. The little tabs can easily break on the connectors, and they'll push right out the bottom when installing a fuse or relay, sometimes making intermittent contact, and sometimes no contact whatsoever.

 

 

See if you're getting power to the switch, and to the actuator - keep in mind power and ground flips on those (at the actuator) from lock to unlock and vice-versa. I'm sure GM uses a magic box to facilitate the polarity flip - that would be my first suspect.