One of the easiest ways to diagnose the switch is by trying to use other door locks in the car.
1999 chevy tahoe rear door power lock not working.
The other three door locks work fine when it is not hot.
The driver lock has completely quit and the other 3 doors work randomly.
Door locks on 3 of 4 doors 2009 tahoe 78000 miles.
However when it is hot 104 f like it was today the locks do not respond to any of the switches driver front passenger.
For vehicles with traditional style door lock cylinders and keys a bad power door lock relay will merely disable the power door lock feature.
Very frustrating have always owned chevy but with oil cunsumption and this problem it will probably my last one.
However vehicles without door lock cylinders will not be able to lock or unlock the doors until power is restored.
Here is my story.
For vehicles equipped with door lock cylinders the door can still be opened using the key.
It is a 2002 honda accord 4cyl special edition.
If they do not then you may have a bigger issue.
1999 tahoe 4 door 4x4 the driver passenger side power door locks are intermittently or not working at all.
The drivers side pdl never responds when the switch is used and the passenger occasinally works.
The rear barn door does t work as well.