Scan Tool Diagnostics

Use the scan tool in order to monitor the communications between the BCM and the PCM/VCM. The scan tool also displays PasslockTM data. The PasslockTM DATA LIST display is located under the PASSLOCK selection. This list shows the status of the hardwired connections from the PasslockTM sensor to the BCM. These scan tool values may be very useful in diagnosing the PasslockTM system.

The PasslockTM system is designed in order to deter theft, even if various parts are changed. The following components may not be changed without the possibility of going into a no-start condition:
^ The PasslockTM sensor
^ The Powertrain Control Module (PCM)
^ The Body Control Module (BCM)
^ The Vehicle Control Module (VCM)

If any of these parts are replaced, refer to the Learn Procedure in BCM Programming/RPO Configuration. Programming and Relearning The BCM and the PCM/VCM require the full 10 minutes in order to complete a lockout cycle. The ignition key MUST remain in the RUN position until the telltale turns OFF. If the ignition key is turned from the RUN position before the telltale turns OFF, you will have to repeat the lockout cycle. The PasslockTM system requires 3 consecutive lockout cycles in order to complete the 30 minute learn procedure for a changed component.