B3055

THEFT DETERRENT - IMMOBILIZER - SOME EXPORT VEHICLES

DTC B3055

CIRCUIT DESCRIPTION
When an ignition key is inserted into the ignition lock cylinder and the ignition is switched ON, 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 a random generated number to the transponder, this is called a challenge. Both the transponder and the theft deterrent control module perform a calculation on the challenge, if the calculations match the theft deterrent control module sends the fuel enable password via the class 2 serial data circuit to the powertrain control module (PCM). If either the transponders unique value or the calculation to the challenge is incorrect the theft deterrent control module will send the fuel disable password to the PCM via the class 2 serial data circuit.

CONDITIONS FOR RUNNING THE DTC
The ignition switch must be ON. The theft deterrent control module cannot have DTC B1327 set as a current DTC.

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
- The theft deterrent control module sends a class 2 message containing a the fuel disable password to the PCM.
- The vehicle will not start.
- The theft deterrent control module sends a class 2 message to the instrument cluster to illuminate the SECURITY indicator.

CONDITIONS FOR CLEARING THE MIL/DTC
- The theft deterrent control module clears the current status of the DTC when it senses a valid, memorized, transponder value from the ignition key.
- The DTC can be cleared by using a scan tool.

TEST DESCRIPTION

Steps 1-10:

The numbers below refer to the step numbers on the diagnostic table.
2. Verifies the condition for setting DTC B3055 is current.
3. The key must be a Passkey 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.
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.