Immobilizer control module under the dash.some vechicles if you replace key remote dealership has to reprogram remotes using diagnostic equipment.try this techinique to synchronize remote transmitter. stand within 5 feet from vechicle .press transmitter lock and unlock buttons simultaneously for 7 seconds . system will lock and unlock doors confirming synchronization. if this dont help dealership has to reprogram remotes.
SOURCE: How do i program remote keyless entry?
You don't normally program a keyless entry, that's done for you by the technicians that install that. If the replaced battery doesn't solve the problem, take the battery and the remote to the techies that installed it.
SOURCE: have a 1999 Chevy silverado 2500 with keyless entry issue
dealer needs to reprogram your key fobs
SOURCE: remote keyless entry not working
KEY FOBS FOR THIS MODEL MUST BE PROGRAMED USING A TECH 2 SCAN TOOL SO IT MUST BE DONE AT THE DEALERSHIP FOR ABOUT HALF HOUR LABOR HOPE THIS HELPS
SOURCE: 2004 Chevy Impala Keyless Entry System Stopped Working
HOPE THIS HELPS YOU MIGHT WANT TO REPROGRAM THAT KEYLESS ENTRY FOB.. JERRY
. Turn the ignition to ACC or ON and the radio to off. Do not crank the engine.
2. Press and hold the DISP button on the radio for at least five seconds until settings is displayed.
3. Press the SEEK up or down arrows until FOB PROG appears on the display.
4. Press the PREV or NEXT button to enter the submenu. The current selection will have an
asterisk next to it. BEGIN will be displayed.
5. Press the DISP button to start programming. When the message PUSH FOB flashes, press and
hold the LOCK and UNLOCK buttons on the first transmitter at the same time for 15 seconds. A
chime will be heard to verify the transmitter is learned.
6. Repeat Step 5 for each additional transmitter up to four remotes total. You do not need to press
the DISP button again, just press down the LOCK and UNLOCK buttons on the next transmitter
to be learned to a maximum of four transmitters per vehicle.
The mode you selected is now set. You can either exit the programming mode by following the instructions later in this section or program the next feature available on your vehicle.
EXIT (Exit Feature Customization Mode): This feature allows you to exit the vehicle customization programming.
To Exit:
1. Scroll until EXIT appears on the display.
2. Press the DISP button to exit programming. A chime will he heard to verify the exit.
SOURCE: Keyless FOB not opening locks
You may have to car to Chevy Dealership to reprogram keyless entry.
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