80s-90s GM Type C Locks Wire Color

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davep.

Gold - Posts: 644

Joined: May 27, 2011

Location: California, United States

Posted: April 04, 2024 at 9:08 PM / IP Logged

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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