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Hello and thanks for your question. My name is Eddie and I will do all I can to help.
Lets try something easy first.
Remove both the pos. and neg. cable from the battery for a minute,
then (away from the battery) Touch the cables together, this will discharge any static in the system.
Reinstall the cables. (pos. first neg. second)
Then, make sure all the doors trunk and hood are closed.
And put the key in the lock cylinder in the drivers door and lock and unlock the doors a few times. Let me know if that helps or not. If not we can try something else. thank you.
sorry it didn;t work, ok now what
OK, do you have a key fob? that unlocks and locks the doors to this vehicle?
Does that work?
It's a generic but it always worked
....and I changed the battery in it
Is this a facotry security system?
or add on?
it's no add-on
OK, Disconnect the battery , for a minute or two, (neg. cable is fine). Reinstall neg. cable, and click the key fob a few times and tell me if the doors respond.
The problem didn't start, until I took the cables off
right I understand.
will it even crank? or run? when you try to start it?
no problem starting
just the doors
OK, if it will start and run, then it's not in theft mode.
You just get no confirmation that the car is locked up correct? with the horn chirp?
I was believing the vehicle had a theft mode problem. But, that is not the case if you can start and drive the vehicle.
...oh yes, when starting the car, the doors lock
alright, Do the parking lights blink when you lock the doors?
...and unlock when car is park
Yes light blink when you lock the doors, at least it use to
ok, Try this, leave a window down, lock all the doors with the remote, reach inside unlock the door and open the door. Does the horn sound then and the alarm go off then? I wanna make sure it's arming itself.
That's just it the remote don't work now
doesn't unlock the doors or do anything?
alright, give me just a minute.
Have you tried another battery in the key fob yet by chance?
alright, This model requires a scan tool to program the key fob to the vehicle unfortunately. It has to be GM specific and advanced type. A regular engine obd ii code reader will not work.
So what can I do now
I wouldn't buy a scanner, (they are pricey) I would suggest contacting an independent shop or dealer to re-program that key fob. shouldn't be more than a 1/2 hours labor. That's really what your up against with a scanner to get into the lock module. Battery lost voltage and lost it's key fob memory in my opinion.
....I brought the car five years ago from a dealership
ok, You really don't need a dealership, if you can find a prominent shop with an advanced scanner for GM vehicles, they should be able to program the remote for you. Esp. one that specializes in GM's.
A fair shop should do that for 30-40 dollars. It will only take 10 minutes or less. That is what I would suggest.
Ok Ed, Thank You
Absolutely, I wish it would have been an easy reset, but I believe the lock module has lost the memory and you will need a scan tool now to reprogram it. Have a great weekend.
Thank You, Oh by the way how can I print this, you don't have a print icon on here
If you can copy and paste it into a word document you can. You can always log back in and see it again, it never goes away, it will always be here fyi.
Thank you Ed, have a good day
Alright, you too.