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Trying to trouble shoot door lock issue on 2008 Chev

Customer Question
Silverado extended cab. Passenger lock...
Trying to trouble shoot door lock issue on 2008 Chev Silverado extended cab. Passenger lock stopped unlocking from remote or either switch but would lock. Then months later driver door lock stopped locking or unlocking from remote or either switch. I assumed it was due to bad actuators as these trucks are notorious for them but when I hooked up new actuator on pass side it would still only lock. Actuator Unlock wire (tan)on pass side has no power lock (grey)wire does. Opposite is true for driver side.
Submitted: 11 months ago.Category: Chevy
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Customer reply replied 11 months ago
When I pull fuse 26 (Driver unlock) and check with a test light it momentarily flashes when I hit the remote which makes sense. When I try the same with fuse 11 (unlock 2) and fuse 10 (lock 2) I get no light when using the remote. I can also hear both relays clicking behind the fuse panel when I hit lock or unlock.
Answered in 2 hours by:
9/18/2017
Chevy Mechanic: Don - Mo Lurch, Auto Mech / Electronics replied 11 months ago
Don - Mo Lurch
Don - Mo Lurch, Auto Mech / Electronics
Category: Chevy
Satisfied Customers: 21,464
Experience: Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.
Verified

You need to Test the "2" wires that LOCK & UNLOCK at the Lock Actuator
The Circuit is "Reversal Rest At Ground"
Meaning:

Use of a VOM is needed to test
The way it works:

Switch held in LOCK position
One wire will have 12 Volts +
One wire will have Ground -

Switch held in UNLOCK position
The wire that had 12 Volts + is now Ground -
The wire that was Ground - is now 12 Volts +

If Voltage or Ground checks good at Actuator, replace Actuator.
If Voltage or Ground does not check good:
Check Switch Voltage & Ground.
Check for broken wires at Door / Kick Panel Boot

LOCK & UNLOCK PCB Relay are bad.
LOCK & UNLOCK PCB Relays are Internal to the Fuse Panel under Hood
LOCK & UNLOCK PCB Relays is a non-serviceable Printed Circuit Board (PCB) relay and the Fuse Panel will need to be replaced

.

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Customer reply replied 11 months ago
Hi there,
Truck is off. Hooked up multimeter on pass side actuator power wires (black probe to tan wire, red probe to grey wire. When I hit the lock button I get a momentary reading of anywhere from 1.7 to 8 volts (tried multiple attempts). When I hit the unlock button I just get 0. Am I testing correctly?
Customer reply replied 11 months ago
I have a new actuator hooked up right now and it will lock but not unlock
Chevy Mechanic: Don - Mo Lurch, Auto Mech / Electronics replied 11 months ago

It would be momentary Voltage + & Ground - as the Relay would cause that
You would switch the probes to test UNLOCK

Switch held in LOCK position
One wire will have 12 Volts +
One wire will have Ground -

"switch probes"

Switch held in UNLOCK position
The wire that had 12 Volts + is now Ground -
The wire that was Ground - is now 12 Volts +

Check for broken wires at Door / Kick Panel Boot

LOCK & UNLOCK PCB Relay are bad.
LOCK & UNLOCK PCB Relays are Internal to the Fuse Panel under Hood
LOCK & UNLOCK PCB Relays is a non-serviceable Printed Circuit Board (PCB) relay and the Fuse Panel will need to be replaced

.

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Chevy Mechanic: Don - Mo Lurch, Auto Mech / Electronics replied 10 months ago

Did you have any other questions?
I see you have viewed my reply but have not selected a rating.

Rating does not incur any additional costs, it simply allows me to be compensated for my time here.
It also does not close the question, you can follow up at any time.
Thank you.

Ask Your Own Chevy Question
Chevy Mechanic: Don - Mo Lurch, Auto Mech / Electronics replied 10 months ago

If your not familiar with how JustAnswer works,
You ask a question, I try and give you the best answer I can and then you leave a positive rating so I get credit for helping..
I strive for excellent ratings and greatly appreciate all bonuses..
Feel free to reply back as many times as needed until your issue is resolved..
.

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