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remote will not unlock door
2003 Toyota Camry REMOTE will NOT lock the car doors. It will unlock and open the trunk. I hear a buzzing sound coming from the dash/ engine compartment when I hit the Lock button on the remote. I have to hit the unlock button in order to get it to stop.
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Relays can also be tested on the bench--there are many YouTube videos that show you how to do that.
Relays aren't always bad if they "buzz"--they could be getting too low a voltage to operate properly, due to perhaps a bad ground circuit or excessive resistance due to corrosion in a connector or in the relay box.
A wiring diagram might be a good help for you, if you know how to read one.
I suppose you could also check for a conspicuous area of damage where the wiring leaves the body and enters into the door.