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Rear Door lock grounding problem

Tiny
BWHUOT63
  • MEMBER
  • 2004 SATURN ION
  • 156,000 MILES
The mechanic replaced the rear left door lock and he says it's getting power but not grounded. Where is the ground wire for the rear door lock?
Thursday, August 2nd, 2018 AT 7:29 AM

8 Replies

Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello, I am Danny.

I have attached a wiring diagram showing the door lock circuit to show your mechanic. It looks like the circuit is grounded off of the Door Lock Actuator. Hope this helps and feel free to ask any questions if needed. Thanks for using 2CarPros.
Danny-
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Thursday, August 2nd, 2018 AT 4:49 PM
Tiny
BWHUOT63
  • MEMBER
  • 15 POSTS
A wiring diagram does not tell me where the ground wire is.
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Friday, August 3rd, 2018 AT 8:07 AM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

It will be located on the power door lock actuator. That is located in top rear of left rear door, near door latch. I have attached a picture of what it looks like and circled the wiring connector in red. I have also attached a link showing how to remove/replace. Hope this helps and thanks again for using 2Carpros.
Danny-

https://www.2carpros.com/articles/test-or-change-electric-power-door-locks
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Friday, August 3rd, 2018 AT 2:18 PM
Tiny
BWHUOT63
  • MEMBER
  • 15 POSTS
I wanted to know where the ground wire for the rear door lock. A wiring diagram does not tell me where the wire is grounded at. I would like to do this myself.
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Friday, August 3rd, 2018 AT 4:40 PM
Tiny
BWHUOT63
  • MEMBER
  • 15 POSTS
How do I ground the rear door lock? I was thinking there is a green wire that attaches to the metal part somewhere inside the door.
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Friday, August 3rd, 2018 AT 8:05 PM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

The ground will be located on the Power Door Lock Actuator. That is located in top rear of left rear door, near door latch. I have attached a picture of what it looks like and circled the wiring connector in red. The ground is in the harness that attaches to this actuator. I have attached another picture. The wires are grey and tan, not green. Hope this helps and thanks again for using 2Carpros.
Danny-
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Friday, August 3rd, 2018 AT 9:11 PM
Tiny
BWHUOT63
  • MEMBER
  • 15 POSTS
I understand that the rear door lock is grounded by the harness, how does the harness get grounded?
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Wednesday, August 8th, 2018 AT 1:55 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
The harness ground will be inside the cab near the firewall but you can make your own ground by running a new ground wire to the circuit. I found these wiring diagrams to help you see how the system works.

Use a test light connected to power and test the system grounds. Here is a guide and the door lock wiring diagrams:

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

Check out the diagrams (below). Please let us know what happens.

Cheers, Ken
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Thursday, August 9th, 2018 AT 9:31 AM

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