B3033

Diagnostic Chart:

Schematic:

Passlock sensor data is supplied to the body control module (BCM) by circuit 1836.

The passlock sensor data supplied to the ECM is in the form of V-codes or voltage codes. When the proper ignition key is turned in the ignition switch, the correct V-code is supplied to the BCM. The ECM responds by sending a serial data password to the engine controller allowing the engine to run.

The security resistor is bypassed under a tamper condition (possible external magnet applied to sensor). In this mode, a specific V-code is supplied to the BCM. The vehicle will not start in this mode.

DTC Parameters
^ Ignition is in RUN, START or ACC
^ The passlock data equals stored tamper V-code for 1 second