1999 Chevrolet Truck Electric door locks

1999 CHEVROLET TRUCK
275,000 MILES • 5.0L • V8 • 4WD • AUTOMATIC
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electric door locks will lock halfway, then will do nothing. I hear the relay switching. I replaced the grounds from the engine to the frame and frame to the firewall. Still doing the same thing. This happens with the remote keyless button and both door switches. Where can I check the ground under the dash?
Dec 8, 2013 at 5:11 PM
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HMAC300
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this may need to be scanned to see if there is anything wrong with door lock receiver. if you have already cleand right side of dash ground that is the one also try lubing the door lock that may all it may need.
Dec 9, 2013 at 8:08 AM