Radio codes of Acura Tl vehicles are part of a standard anti-theft system. To the reset the system just unplug the battery from the car for at least five seconds.
The factory security system is reset by unlocking the doors with a key or remote.
Reset anti theft system
To reset the anti-theft sound system on a 2003 Acura MDX, first, turn the ignition key to the "ON" position without starting the engine. Then, press and hold the "Radio" power button until the display shows "CODE" or "SECURITY." Enter the radio code using the preset buttons; if entered correctly, the radio should unlock. If you don't have the code, check the owner's manual or contact a dealer for assistance.
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Remove the Anti-theft system fuse.
Hit the reset button.
how to reset anti-theft system to start engine
If the key for the Pontiac has a security chip in it as well, simply wait about fifteen minutes without doing anything and then your car should start. If the key does not have a security chip you may have to remove the battery to reset the system.