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Username Post: How can I test power door lock relay        (Topic#366509)
chevrolation 
Newbie
Posts: 31

Reg: 07-09-16
09-25-21 07:45 AM - Post#2827930    

I'm in the middle of a very frustrating electrical issue with my 99 Tahoe 4 door I can lock and unlock all the doors with the remote but I cannot lock and unlock the doors with door switches I have unraveled all the wires in the doors and checked them all for continuity, fixed wires that have been cracked or frayed by door opening and closing so I'm at the point that I think I need to check the door lock relay but I don't know how to test that to make sure it is working any help would be greatly appreciated

2016 express 3500
1999 tahoe 4dr


 
wagonman100 
Site Ambassador
Posts: 15360

Loc: Baltimore, MD
Reg: 11-27-04
09-26-21 07:39 PM - Post#2828066    
    In response to chevrolation

If the locks work from the remote but not the door switch, it is not a relay. You can switch it with another known good relay, but I think you will find you will have the same problem. You can put your hand on the relay as you use the remote and you will fell a vibration and hear a click as the relay activates. I think you probably have a bad lock switch(es). On some vehicles, if the master switch on the drivers door goes bad, the other switches won’t work.

Jay
Friends don’t let friends drive Fords.

1999 Silverado Z71 4X4 extra-cab short bed
1983 Malibu Fauxmad - tubbed
1978 El Camino Kustomized
1972 Monte Carlo
1957 210 handyman wagon
1957 Nomad sport wagon
1957 Cameo Carrier


 
chevrolation 
Newbie
Posts: 31

Reg: 07-09-16
09-27-21 03:10 AM - Post#2828080    
    In response to wagonman100

Sorry, I should have mentioned that I put a new switch in drivers door when wires seemed to be in good condition

2016 express 3500
1999 tahoe 4dr


 
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