Body Control System Diagnosis
B3033 - Security System Indicates TamperSchematic:
CIRCUIT DESCRIPTION
The passlock sensor is powered by circuit 812. The passlock sensor is grounded by circuit 1057. 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 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
^ Service (wrench) light will illuminate.
^ Security light will illuminate
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.
^ If fault is suspected to be intermittent, wiggling harness wiring may help in locating fault.
TEST
Diagnostic Chart:
