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80s-90s GM Type C Locks Wire Color

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=147989
Printed Date: May 03, 2025 at 4:36 AM


Topic: 80s-90s GM Type C Locks Wire Color

Posted By: davep.
Subject: 80s-90s GM Type C Locks Wire Color
Date Posted: April 04, 2024 at 9:08 PM

I figured this out on my own. Here are my notes that are going on my shop wall:
BLUE: UNlock
BLACK: Lock
TAN: Motors, (+) UNlock
GRAY: Motors (+) Lock

For All-doors lock/unlock:
Grn/Blk (#30) and Wht/Blk (#87a) Which are LOCK to the Black car wires
Blu/Blk (#30) and Brn/Blk (#87a) Which are UNlock to the Lt Blue car wires.

If you want 2nd Unlock: The blu/blk and brn/blk have to go in the tan wire to the driver's lock motor, the add-on relay 87a goes to blu/blk and 30 to the tan wire for the passenger lock motor.


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