Power locks not working

Tiny
JOE DENALI
  • MEMBER
  • 1999 GMC YUKON
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 70,000 MILES
Fuse #3 blows and locks don’t work, but fuse doesn’t say anything about power locks. # 13 is locks and is not blown but lock don’t work.
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Monday, September 16th, 2019 AT 10:42 AM

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Tiny
94 TRANSAM
  • EXPERT
Hi and welcome back. Lets see what we can do for you.

(Edit) Sorry misread your post but advice still applies to #3 fuse. Half those circuits are in the door. Also could be 2 issues, 1 being a bad master window switch.

The #13 fuse does run the door lock circuit. (See diagram below) This has a complete circuit description for each fuse.

The 2 most common issues are:

1: A shorted master window switch from rain water dripping in it.

2: A broken or chafed wire in the door jamb. (Less common)

This does not however mean the short is in the window circuit.

Best way to test this is to solder 2 wires to a 1056 light bulb. Then put 2 male spade connectors on the wires. Trim them down so they fit in the fuse plugs then plug it in. If there is a short the bulb will light. Then wiggle the harnesses and unplug things in that circuit until the light goes out and you will have found your short.

Let us know how it turns out or if you need more help.

Rich.
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Monday, September 16th, 2019 AT 4:52 PM

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