When an ignition key is inserted into the ignition lock cylinder, the transponder embedded in the head of the key is energized by the exciter coils surrounding the ignition lock cylinder. The energized transponder transmits a signal that contains its unique value, which is received by the theft deterrent control module . The theft deterrent control module then compares this value to a value stored in memory (learned key code). If the value is correct the theft deterrent control module sends the enable password via the class 2 serial data circuit to the PCM.

The ignition switch must be in RUN. The theft deterrent control module cannot have DTC B1327 set as a current DTC.

If the code from the ignition key does not match one stored in memory, the theft deterrent control module sets this DTC. This code indicates the use of a key with a transponder that has not been learned by the theft deterrent control module. The vehicle considers this to be a theft attempt.

The theft deterrent control module clears the current status of the DTC when it senses a valid, memorized, key code from the ignition key (transponder).

The numbers below refer to the step numbers on the diagnostic table.

2. To set this code, a key with a working transponder was read by the theft deterrent control module. For that key to operate the vehicle, a 10 Minute or 30 Minute Re-Learn Procedure must be performed.