B2960

Diagnostic Chart:

SCHEMATIC
Refer to 160/310 Cell 133: Vehicle Theft Deterrent Module schematic

CIRCUIT DESCRIPTION
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 VTD (Pass key III(R)) Module. The VTD (Pass Key III(R)) Module then compares this value to a value stored in memory (learned key code). If the value is correct the VTD (Pass Key III(R)) Module sends the enable password via the class 2 serial data circuit to the PCM.

CONDITIONS FOR RUNNING THE DTC
The ignition switch must be in RUN.

CONDITIONS FOR SETTING THE DTC
If the code from the ignition key does not match one stored in memory, the VTD (Pass key III(R)) Module sets this DTC. This code indicates the use of a key with a transponder that has not been learned by the VTD (Pass Key III(R)) Module. The vehicle considers this to be a theft attempt.

ACTION TAKEN WHEN THE DTC SETS
^ The VTD (Pass Key III(R)) Module sends a class 2 message containing a disable password to the PCM.
^ The vehicle will not start.
^ The VTD (Pass Key III(R)) Module sends a class 2 message to the instrument cluster to flash the SECURITY indicator.

CONDITIONS FOR CLEARING THE MIL/DTC
The VTD (Pass key III(R)) Module clears the current status of the DTC when it senses a valid, memorized, key code from the ignition key (transponder).

TEST DESCRIPTION
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 VTD (Pass key III(R)) Module. For that key to operate the vehicle a 10 Minute or 30 Minute Re-Learn Procedure must be performed.