B3031

Diagnostic Chart (Part 1 Of 2):

Diagnostic Chart (Part 2 Of 2):

Schematic:

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

The passlock sensor data supplied to the BCM 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 BCM responds by sending a serial data password to the powertrain control module (PCM) allowing the engine to run.

If the BCM has not learned a V-code, DTC B3031 will be set. The vehicle will not start.

DTC Parameters
^ Ignition is in RUN, START or ACC
^ The BCM has not learned a valid V-code
^ Turns on service wrench telltale and security telltale

Diagnostic AIDS
^ Check for poor connection at the BCM. Inspect harness connectors for backed out terminals, improper terminal mating, broken connector locks, improperly formed or damaged terminals and poor terminal-to-wire connection (terminal crimped over wire insulation and not conductors).
^ Inspect wiring harness for damage. Check for broken or chaffed insulation.
^ Check for poor connection at the passlock sensor.
^ If fault is suspected to be intermittent, wiggling harness wiring may help in locating fault.