![]() When the ignition switch is placed in the Start position, a discrete 12-volt signal is supplied to the body control module (BCM) notifying it that the ignition is in the Start position. The TDM and ECM have now relearned the pre-release password and the challenge/response data. With a master vehicle key, turn the ignition to the RUN position for 15 seconds, then start the vehicle. Turn OFF the ignition and wait 2 minutes. The vehicle is now ready to relearn the key information and/or the passwords on the next ignition switch transition from OFF to CRANK. Observe the scan tool, after approximately 10 minutes the scan tool will display "Programming Successful, Turn OFF Ignition".
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