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 serial data circuit to the powertrain control module (PCM).

This diagnostic procedure supports the following DTC:

DTC B2960 Security System Sensor Data Incorrect But Valid

The microprocessor runs the program to detect a check sum error after each power up. This program runs only if the DTC B1982 or B1983 are not set as a current DTCs.

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

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

2. Verifies the condition for setting DTC B2960 is current.

4. The only method to determine which re-learn procedure to perform.

5. To set this code, a key with a working transponder that is not learned was read by the theft deterrent control module. For that key to operate the vehicle and one or more learned keys are available, perform the Adding Keys procedure.

6. To set this code, a key with a working transponder that is not learned was read by the theft deterrent control module. For that key to operate the vehicle and there is only one key available, a 10 minute or 30 minute re-learn procedure must be performed.