When an ignition key is inserted into the ignition lock cylinder, the transponder that is embedded in the head of the key is energized by the exciter coils that surround the ignition lock cylinder. The energized transponder transmits a signal that contains its unique value, which is received by the VTD module . The VTD module then compares this value to a value stored in memory (learned key code). If the value is correct, the VTD module sends the enable password via the class 2 serial data circuit to the PCM.
The ignition switch must be in the RUN position. The VTD 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 VTD module sets this DTC. This code indicates the use of a key with a transponder that has not been learned by the VTD module. The vehicle considers this to be a theft attempt.
• | The VTD module sends a class 2 message containing a disable password to the PCM. |
• | The vehicle will not start. |
• | The VTD module sends a class 2 message to the instrument cluster to flash the SECURITY indicator. |
The VTD (Pass Key® III) module clears the current status of the DTC when the module senses a valid, memorized, key code from the ignition key (transponder).
The numbers below refer to the step numbers on the diagnostic table.
Step | Action | Yes | No |
---|---|---|---|
1 | Did you perform A Diagnostic System Check - Vehicle Theft Deterrent? | Go to Step 2 | |
Important: If a 10 Minute or 30 Minute Re-Learn Procedure is performed, all keys not learned at that time will be erased and will not be recognized. Perform the Quick Learn Procedure on all keys, or instruct the customer how to perform the Quick Learn Procedure. Perform the VTD (Pass Key® III) module learn procedure. Refer to Programming Theft Deterrent System Components . Is the procedure complete? | Go to Step 3 | -- | |
3 |
Does the DTC reset? | Go to Step 2 | System OK |