B2955

DTC B2955

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 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 modules sends the fuel enable signal to the powertrain control module (PCM).

CONDITIONS FOR RUNNING THE DTC
The ignition is ON.

CONDITION FOR SETTING THE DTC
The theft deterrent control module is unable to measure the ignition key transponder value. This may be due to a damaged or missing transponder, a non Passkey III (PK3) key, or a damaged exciter.

ACTION TAKEN WHEN THE DTC SETS

IMPORTANT: If the theft deterrent control module is unable to measure the ignition key transponder value for 30 consecutive seconds, after the vehicle has started,the module will enter a fail enable state. The vehicle will not stall or stop running. If the theft deterrent control module is in a fail enable state when the ignition is turned to OFF, it will remain fail enabled until the next time the vehicle is started. If the theft deterrent control module is fail enabled, the PASS-KeyIII system is NOT active and the vehicle will start. The theft deterrent control module WILL send its enable signal even if a transponder value is not received. The theft deterrent control module will remain fail enabled until the module measures a valid key transponder value.

- The theft deterrent control module sends the fuel disable signal to the PCM.
- The vehicle will not start.
- The theft deterrent control module flashes the SECURITY indicator.

CONDITIONS FOR CLEARING THE MIL/DTC
- A history DTC will clear after 100 consecutive fault free ignition cycles.
- Using a scan tool in order to clear a history DTC.

DIAGNOSTIC AIDS
Refer to Diagnostic Aids for Circuit Testing and Wiring Repair procedures.

TEST DESCRIPTION

Steps 1 - 7:

Steps 8 - 11:

The numbers below refer to the step numbers on the diagnostic table:
2. Verifies the condition for setting DTC B2955 is current.
3. The key must be a PASS-Key�III transponder key with an operating transponder for the system to work.
4. The only method to confirm whether the transponder in the key or the theft deterrent control module is malfunctioning is to try a alternative component in the system. The vehicle was delivered with 2 keys.
5. The possibility is unlikely that more than one key will be defective. If all keys do not work, the theft deterrent control module must be malfunctioning.
6. If the vehicle has a malfunctioning theft deterrent control module that malfunctioned during an ignition cycle, the system will be "fail enabled" and the vehicle will start for all keys.
7. If a new key must be tried, the key must have the proper mechanical cut and the theft deterrent control module must "learn" the transponder value.
8. If only one key was available for the vehicle and the replacement key does not work, the theft deterrent control module must be malfunctioning.