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Help!!! Keyless entry locks but doesnt unlock!

Bradym2beast

Full Member
Joined
Jul 14, 2020
Messages
13
hey guys, bought an 03 avalanche (1st time av owner) about a week ago. They lady I bought it from told me it was a brand new fob, brand new battery and it still wouldn't work. So I got it home and did a resync, and a reprogram. Still nothing. Replaced the battery in the fob and did everything again. Still nothing. The fob will only lock the truck but won't unlock it. Any ideas?
 
Does it unlock with the door switch
 
Since the AV is new to you, how it is suppose work press once to unlock the drivers door twice to unlock all the door.

Is it making any noise when you press unlock
 
I dont know exact function, but I've tried just a single press, press and hold, double press. Nothing. No beep, no lights, I dont hear a solenoid click. There's just nothing. The lock fuction is click one for lock twice for alarm and the lights turn on and the horn honks.
 
I had to set the lock function threw the steering wheel buttons if I remember right
 
Yeah you can set it to beep or turn the lights on or both but you can't turn on or off a lock/unlock function
 
I had to go outside and test again yes you are correct.

Check back later this evening and I'll check the service manual for what can cause it to not unlock with the remote
 
Why did she buy a new key fob? Did the old fob have the same issue? If the inside locks work, I'd suspect the fob unless the error was on 2 or more remotes.

Can you sync the fob to a different GM vehicle to test the unlock button?
 
The only other vehicle I have that could work is a 2015 traverse but my old lady won't let me dick with it to see if its the fob or not. ?
 
Ok boys, New fob worked. Idk why the old "new fob" wouldn't but i guess it just was defective maybe? Anyway, thank you all for the help! Love the truck hope to get a long life outta it!
 
Hello! I have a similar problem, but it’s intermittent and it’s maddening. Both the key fob and door switch always lock the doors but at times neither will Unlock when pressed, and both fail at the same time. I have the locks set to unlock when put in park and that always works! Please help!
 
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