Changing the PASSLOCK Components

The design of the PASSLOCK system is to prevent theft even if the various theft deterrent parts change. The parts that can no longer be changed without the possibility of going into a tamper mode are:
^ The PASSLOCK sensor
^ The BCM
^ The PCM

If you replace any of these parts the vehicle may not start for 10 minutes. This is the long tamper mode. If this occurs, the system must go through a long tamper mode cycle. During this time the SECURITY indicator will be flashing for the full 10 minutes and DTC B3031 will be set. The BCM and the PCM require the full 10 minutes in order to complete a learn cycle. The ignition switch must remain in the ON position until the SECURITY indicator stops flashing. You will need to repeat the cycle if the ignition switch does not remain in the ON position. When replacing any of the above parts, perform the Programming Theft Deterrent System Components procedure.

The design of the PASSLOCK system is to prevent the vehicle operation if the proper ignition key is not used in order to start the vehicle. The mechanical key, in normal operation, will turn the ignition lock cylinder. The PASSLOCK sensor monitoring the position of the lock cylinder will relay the PASSLOCK data to the Body Control Module (BCM). The BCM will determine the validity of the PASSLOCK data. The BCM will send a password to the Powertrain Control Module (PCM). When the PCM receives the correct password the PCM allows the crank relay and fuel injectors to operate normally. The PASSLOCK system requires the PCM and the BCM to communicate the various functions in order to operate. These functions transmit over the class 2 serial data line. For an explanation of the class 2 serial data description and operation refer to Data Link Communications Description and Operation in Data Link Communications.