I have 2002 trailblazer, gets in program mode,but after 2 seconds exit the program mode. any help??

. Remove key from ignition switch.2. Close all doors.
3. Open drivers door
4. Insert key and turn to ON position and within 10 seconds turn
key off and remove key.
5. Within 20 seconds Close and open drivers door 3 times.
6. Insert key and turn to ON position and within 10 seconds turn
key off and remove key.
7. Locks should now lock and unlock automatically to confirm you
have entered programming mode.
8. Press the UNLOCK button on remote and locks should cycle to
confirm programming.
9. Repeat step 8 on each additional remote.
10. Exit vehicle with keys and remote, close door test remote(s).

Programming
When
Key(s) added or replaced. System malfunction.
How
Obtain all keys fitted with remote control. Fasten seat belts and close all doors. Turn ignition switch from position I to position II 4 times within 6 seconds. Turn ignition switch to position I ( 11/2000). Switch ignition OFF (12/2000 ). Programming mode activated for 10 seconds proceed as follows: Press and hold lock, unlock or boot release button Fig. 1 [1], [2] or [3]. Wait for acoustic signal (indicates correct programming). Repeat above procedure within 10 seconds to program remaining keys. To exit programming mode: Turn ignition switch to position III or wait 10 seconds. Keys can also be programmed using diagnostic equipment.


NOTE: A maximum of 4 keys can be programmed

Programming
When
Key(s) added or replaced. System malfunction.
How
Obtain all keys fitted with remote control. Turn ignition switch from position 0 to position II 4 times within 6 seconds. Turn ignition switch to position 0. The system will emit an acoustic signal to indicate start of programming mode. Programming mode activated for 10 seconds proceed as follows: Press and hold lock, unlock or boot release button Fig. 1 [1], [2] or [3]. Wait for acoustic signal (indicates correct programming). Repeat above procedure within 10 seconds to program remaining keys. To exit programming mode: Turn ignition switch to position III or wait 10 seconds. Keys can also be programmed using diagnostic equipment.
NOTE: A maximum of 4 keys can be programmed

Note:
Entering the programming mode cancels all learned keyless remotes, so none of the
previously programmed remotes will work. You must reprogram all of the keyless
remotes once you are in the programming mode. You must complete each step within 5 seconds of the previous step to keep the
system from exiting the programming mode.
1. Turn ignition switch to ON (II)
2. Press the LOCK or UNOCK button on one of the remotes. (An unprogrammed
remote can be used for this step.)
3. Turn ignition switch to LOCK (0)
4. Repeat steps 1, 2 and 3 two more times using the same keyless remote used
in step 2
5. Turn the ignition switch to ON (II)
6. Press the LOCK or UNLOCK button the same remote. Make sure the power door
locks cycle to confirm you are in programming mode.
7. Press the LOCK or UNLOCK button on each remote you want to program. Make
sure door locks cycle after you push each remote button to confirm system has
accepted the remote.
8. Turn the igniton switch to LOCK (0) to exit programming mode.
9. Test remote(s)

1. Close all doors.
2. Press and hold the Unlock button on door lock switch on drivers door.
Hold until instructed to release.
3. Insert and remove key from ignition 2 times. Do Not turn ignition.
4. Insert key in ignition a third time and leave key in ignition. Do Not turn ignition.

5. Release door lock switch on drivers door panel.
A Chime will sound 3 times indicating that you are in programming mode.
6. Press both the Lock and Unlock buttons on the remote up to 30 seconds.
A chime will sound 2 times if remote has programmed successful.
7. Repeat step 6 if you are programming additional remotes.
8. Remove key from ignition to exit programming mode.

you should be able to have them tested at parts department at chevy dealership and I dont think they will charge ya. I may be wrong but they can test them.otherwise it could be a unit called a liftgate module is what recieves signal

SECTION 501-14B: Keyless Entry/Computer Operated Locks 1999 Town Car Workshop Manual GENERAL PROCEDURES Programming —Keyless Entry Keypad Code

1. Enter the permanent factory keyless entry keypad code.

1. Press the 1/2 button within five seconds to activate the programming mode. Holding the 1/2 button for more than two seconds will erase all stored customer codes. The existing codes do not need to be erased to program new codes.

1. Enter the new five-digit keyless entry keypad code.

1. To associate the new code with personality positions 1, 2 or 3, press the 1/2 button within 5 seconds of entering the 5th digit of the new code for position 1 or 3/4 button for position 2 or 5/6 for position 3. The door locks will lock and unlock confirming the new code is programmed.

1. If another code is to be programmed, begin entering the code within 5 seconds of the last button pressed.

1. After all new keyless entry codes are programmed:
   • Press keyless entry keypad buttons 7/8 and 9/0 at the same time to exit the program mode.
   • Wait for 5 seconds; the driver door module (DDM) will exit the program mode automatically.
   • -------------------------------------------------------------

Programming —Transmitter

1. Cycle the ignition from OFF to RUN four times within three seconds. The locks will then lock and unlock, confirming program mode has been entered.

1. NOTE: When the first keyless entry remote transmitter is programmed, all other keyless entry remote transmitters are erased.
   Press any button on the transmitter to be programmed.

1. If additional keyless entry remote transmitters are to be programmed, repeat step 2 within 7.5 seconds.

1. To exit program mode, turn the ignition to START or wait 7.5 seconds.

--------------------------------------------------
Programming —Remote Memory Activation NOTE: This procedure must be completed within 5 seconds.

1. Press the SET button on the driver door panel.

1. Press any button on the keyless entry remote transmitter to be associated with a memory setting.

1. Press the 1 or 2 memory button on the driver door panel.

-------------------------------------------------------------
Programming —Autolock and Horn Chirp

1. NOTE: This procedure must be completed within 30 seconds.
   Turn the ignition switch to RUN.

1. Press the UNLOCK button three times.

1. Turn the ignition switch to OFF.

1. Press the UNLOCK button three times.

1. Turn the ignition switch to RUN. The doors will lock and unlock to confirm entry into program mode.

1. Press the UNLOCK button once to toggle the Autolock feature on or off, or twice to toggle the Horn Chirp function on or off. The horn will chirp to confirm toggling of the Autolock feature.

1. Exit program mode by turning the ignition to OFF, START, or wait 7.5 seconds.

----------------------------------------------------------------------------------

Hi, Stacie,

here's the instructions for a 97 TL - I hope they're the same.

Note:
Entering the programming mode cancels all learned keyless remotes, so
none of the previously programmed remotes will work. You must reprogram
all of the keyless remotes once you are in the programming mode.
You must complete each step within 4 seconds of the previous step to keep
the system from exiting the programming mode. You must program remotes
within 10 seconds of each other
1. Turn ignition switch to ON (II)
2. Within 4 seconds press the LOCK or UNOCK button on one of the remotes.
(An unprogrammed remote can be used for this step.)
3. Within 4 seconds turn ignition switch to LOCK (0) position
4. Within 4 seconds turn the ignition switch to ON (II)
5. Repeat steps 2, 3 and 4 two more times using the same keyless remote
used in step 2
6. Within 4 seconds press the LOCK or UNLOCK button on the same remote.
Make sure the power door locks cycle to confirm you are in programming
mode.
7. Within 10 seconds press the LOCK or UNLOCK button on same remote.

8. Within 10 seconds press the LOCK or UNLOCK button on all other
remotes you want to program. Make sure door locks cycle after you push
each remote button to confirm system has accepted the remote.
9. Turn the igniton switch to LOCK (0) to exit programming mode.
10. Test remote(s)

Hope this helps :)

John

Note:
Entering the programming mode cancels all learned keyless remotes, so
none of the previously programmed remotes will work. You must reprogram
all of the keyless remotes once you are in the programming mode. You must complete each step within 4 seconds of the previous step to keep
the system from exiting the programming mode. You must program remotes
within 10 seconds of each other
1. Turn ignition switch to ON (II)
2. Within 4 seconds press the LOCK or UNOCK button on one of the remotes.
(An unprogrammed remote can be used for this step.)
3. Within 4 seconds turn ignition switch to LOCK (0) position
4. Within 4 seconds turn the ignition switch to ON (II)
5. Repeat steps 2, 3 and 4 two more times using the same keyless remote
used in step 2
6. Within 4 seconds press the LOCK or UNLOCK button on the same remote.
Make sure the power door locks cycle to confirm you are in programming
mode.
7. Within 10 seconds press the LOCK or UNLOCK button on same remote.

8. Within 10 seconds press the LOCK or UNLOCK button on all other
remotes you want to program. Make sure door locks cycle after you push
each remote button to confirm system has accepted the remote.
9. Turn the igniton switch to LOCK (0) to exit programming mode.
10. Test remote(s)

1. Close all doors.
2. Press and hold the Unlock button on door lock switch on drivers door.
Hold until instructed to release.
3. Insert and remove key from ignition 2 times. Do Not turn ignition.
4. Insert key in ignition a third time and leave key in ignition. Do Not turn ignition.

5. Release door lock switch on drivers door panel.
A Chime will sound 3 times indicating that you are in programming mode.
6. Press both the Lock and Unlock buttons on the remote up to 30 seconds.
A chime will sound 2 times if remote has programmed successful.
7. Repeat step 6 if you are programming additional remotes.
8. Remove key from ignition to exit programming mode.