Question about 1999 Cadillac DeVille
PASSKEY LOCKOUT RESET :----
1) Put the key in the ignition and turn to the "ON" position. Leave it that way for 10 minutes. After 10 minutes turn the key and take it out. Repeat this process (2) more times (3 times, 30 minutes total) This should reset the passlock system to recognize your key.
You have been locked out by the pass lock system and it needs to relearn the security system. Here's how to do it without a scan tool. It takes 3o minutes and patience to do it right.
30 Minute Learn Procedure
Tools Required: None
Turn ON the ignition, with the engine OFF.
Attempt to start the engine, then release the key to ON (vehicle will not start).
Observe the SECURITY telltale, after approximately 10 minutes the telltale will turn OFF.
Turn OFF the ignition, and wait 5 seconds.
Repeat steps 1 through 4, 2 more times for a total of 3 cycles/30 minutes. The vehicle is now ready to relearn the Passlock Sensor Data Code and/or passwords on the next ignition switch transition from OFF to CRANK. IMPORTANT: The vehicle learns the Passlock Sensor Data Code and/or password XX the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.
Start the engine. The vehicle has now learned the Passlock Sensor Data Code and/or password.
With a scan tool, clear any DTCs if needed. History DTCs will self clear after 100 ignition cycles.
If still the same problem then , the problem is most likely the receiver for the key transponder, the dealer can test this system with a special electronic test tool called tech 2 scanner.
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Posted on Jul 11, 2010
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Posted on Jan 02, 2017
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