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camerontech
camerontech, Auto Mechanic
Category: Chevy
Satisfied Customers: 380
Experience:  diagnostic auto tech
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2004 chevy impala, lost key, replaced ignition set...will

Customer Question

2004 chevy impala, lost key, replaced ignition set...will not start
Submitted: 1 year ago.
Category: Chevy
Expert:  camerontech replied 1 year ago.

hi there,

Im cam, a licenced diagnostic technician.

After replacement of the ignition switch assembly, the theft system must do a relearn.

If the relearn does not work than it will have to be programmed with a "tech2" scanner.

90% of the time the "30 minute" relearn procedure will work.

this is the procedure:

30 Minute Learn Procedure

Tools Required

None

Important: The vehicle learns the Passlock™ Sensor Data Code and/or password ***** the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.

  1. Turn ON the ignition, with the engine OFF.
  2. Attempt to start the engine, then release the key to ON (vehicle will not start).
  3. Observe the SECURITY telltale, after approximately 10 minutes the telltale will turn OFF.
  4. Turn OFF the ignition, and wait 5 seconds.
  5. Repeat steps 1 through 4 two 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).
  6. Start the engine (the vehicle has now learned the Passlock™ Sensor Data Code and/or password).
  7. With a scan tool, clear any DTCs if needed (history DTCs will self clear after 100 ignition cycles)eith

good luck with your repair!

thanks and i appreciate positive ratings!

cam

Expert:  camerontech replied 1 year ago.

hi there,

Just wondering how your repair went?!

cam