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My impala did same thing and then would not start. I suspected anti theft problem I then had chevy dealer change ignition switch. It fixed problem second time I wasn't going to pay $ 750 for so I bought $40 dollar switch on ebay. It was an easy job following great video on you tube. When I went to start car it would not go. While doing relearn procedure (hook up battery charger before starting procedure) I got very tired of door chime so I found it was coming from left front door speaker. I removed wire to stop chime. When i went back to relearn procedure car started right up. I have a steady security light on but car has run fine for months. If you cruise and heater fan has also stopped working add wire from switched terminal on ignition switch to power feed wire on heater. It fixed both problems on mine.
Relearn for what ? Anti theft system PK3 ? The relearn procedure is three 10 min. procedures for a total of 30 min.
30-Minute Relearn Procedure
Use this procedure after replacing the following components:
The passkey III (PK3) keys
The PCM, see important above
Important: This procedure is not available on vehicles equipped with option code (Z49).
If replacing a BCM with an GM SPO Replacement Part, perform the procedure to setup a new BCM prior to the 30-minute relearn procedure.
With a master passkey III key, turn ON the ignition, with the engine OFF.
Observe the STARTING DISABLED DUE TO THEFT message on the drivers information center (DIC), after approximately 10 minutes the STARTING DISABLED DUE TO THEFT message on the DIC will turn off.
Turn OFF the ignition, and wait 5 seconds.
Repeat steps 1-3 two more times for a total of 3 cycles or 30 minutes.
Important: The vehicle learns the key transponder information and/or passwords on the ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.
With a master passkey III key, start the vehicle. The vehicle has now learned the key transponder information and the PCM has now learned the fuel continue password.
You have to do a relearn procedure on the anti-theft system:
Attempt to start the vehicle. Leave the ignition on until the THEFT SYSTEM indicator turns off (about 10 minutes). Turn the ignition switch off. Leave the ignition switch off with key in for about 10 minutes. Attempt to start vehicle.
TURN ON IGNITION SWITCH TO ON POSITION.ENGINE OFF.REPEATEDLY PRESS VECHICLE INFORMATION BUTTON UNTIL PRESS TO RELEARN REMOTE KEY IS DISPLAYED.PRESS SET RESET BUTTON UNTIL REMOTE KEY LEARNING ACTIVE IS DISPLAYED. IF THAT PROCEDURE DONT WORK.INSERT MASTER KEY INTO IGNITION SWITCH.NOW SWITCH IGNITION ON SWITCH IGNITION OFF.REMOVE MASTER KEY.WITHIN 10 SECONDS INSERT NEW KEY.SWITCH IGNITION ON.ENSURE SYSTEM WARNING LAMP SWITCHES OFF.NEW KEY NOW PROGRAMMED.IF YOU STILL HAVING PROBLEM RESETING THEFT SECURITY SYSTEM THE DEALERSHIP HAS TO FIX.REPROGRAM IT.
hi , not necessarily , did you replace the key and tumbler , or the ignition switch (electrical part) ? there is a password relearn procedure , attempt to start the vehicle , leave ignition on until THEFT SYSTEM indicator turns off , (approximetly 10 minutes) , turn ignition switch off , attempt to start vehicle , if vehicle starts , password has been learned ... if password does not relearn , i can post some diagnostic procedures .
You will also need to swap the speedo cluster. thats where the anti theft module is located. After that you may still need to relearn the key switch.I will look at the wiring diagrams and get back to you on the starter circut in side the vehicle. You may have to change some other things.Talk to ya soon. Dan