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Located on white sticker which is on top of the lock control unit located either 1. in the spare compartment in the rear driver side. (where jack and tools are), or 2. behind the passenger side "B" pillar (need to remove the 2 inside plastic covers near the seat belt shoulder attachment (adjustment). Once you have this code, it will either unlock the car, or you will need to reset the code. (follow directions in the owner's manual).
The problem is in the keypad assembly. It causes the interior lights to come on and off and can drain the battery. This also causes the doors to lock and unlock without driver input. The keypads on this model usually go out if someone is playing with it or trying to discover the unlock combination. If you don't need to use the keypad for entry or access to the trunk you can disconnect the keypad and you won't experience the above mentioned problems.
Maybe a little late here but i have a fix for this after turning down my dealers generous offer of a 750gbp fix i did some extensive googling and found this.... With your ignition on open the tailgate using the catch inside then turn off ignition and disconnect the battery for a minute. Reconect the battery and turn on ignition and let the warning lights go through their cycle. With the ignition still on shut the tailgate and hey Presto should be as good as new.
reset the central locking system by locking car with key in drivers door and hold key over for 30 secs.then pressing and holding down unlock button on keypad OR unlock door with key and hold key over 30secs (windows may go down, thats okay,some cars are fitted with auto windows)then press and hold lock button on keypad.making sure that in both cases you know the keyfob battery is in good nick....should reset system
look for the permanent code on the plastic card in the owner manual packet. Or, pay dealer to extract code from computer.
Keyless Entry Keypad Code Programming
NOTE: The system only allows one code to be programmed.
Enter the permanent factory keyless entry keypad code.
Press the 1/2 button within five seconds to activate the programming mode. Holding the 1/2 button for more than two seconds after activation will erase the stored customer code . The door locks will lock, then unlock, confirming the code is erased. The existing code will not need to be erased to program new a code.
Within five seconds, enter the new five-digit keyless entry keypad code. The door locks will lock and unlock to confirm the new code is programmed.
you know my mom has this same issue with her rear door where you hit unlock it sounds like it unlocks but doesnt...she has done the following..she has a keypad with automatic locks she will hit the lock button and then the unlock button and it unlocks it...as for someone elses suggestion im not sure but its annoying and she doesnt care to have it fixed so it works for her.
your issue involves the master control switch panel on the drivers side and or the passenger side as well some how the contact inside the switch assembly has either shorted out or no longer makes contact for the unlock side of the circuit. replace the drivers side panel switchs it's either a series of switc hs or mostimes one sigle board of switchs. you are better off going to an auto parts store rather than a GM dealership this will save you quite a bit on cash on the parts. now as to the rear tailgate. if it is electronic controled and there is an issue with the master switch you can,t manually unlock it because of a safty issue built in the system. you can manually unlock the passenger compartment doors for thew same reasons of safety but doesn't apply to the tailgate. just replace the parts and this will take care of the problem