B3033

Diagnostic Chart (Part 1 Of 3):

Diagnostic Chart (Part 2 Of 3):

Diagnostic Chart (Part 3 Of 3):

Schematics:

CIRCUIT DESCRIPTION
The Body Control Module (BCM) will read an analog voltage from the PASSLOCK sensor. Based on the PASSLOCK internal reference, the BCM will determine if the indicated voltage is 1 of the following conditions:
- Open
- Shorted to ground
- A valid code
- A tamper code

In the case of a tamper code the BCM is reading a tamper code.

CONDITIONS FOR SETTING THE DTC
- The BCM will inspect for a tamper code when the ignition switch rotates from ON to CRANK.
- The BCM is reading a tamper code from the PASSLOCK sensor for longer than 1.0 seconds.

ACTION TAKEN WHEN THE DTC SETS
- The vehicle will not run. The security telltale will be flashing.
- The PASSLOCK state is Tamper.

CONDITIONS FOR CLEARING THE DTC
- The DTC will clear once an ignition cycle occurs without the fault recurring.
- The BCM history codes will clear after 100 ignition cycles occur without the fault recurring.
- Use a scan tool.

DIAGNOSTIC AIDS
- Prior to replacing a BCM, ensure that all of the diagnostics have been completed. Refer to Body Control Module Replacement in Computers and Control Systems.
- Perform a visual inspection of the wiring and the connectors.
- The VTD internal diagnostics are not run while the tamper timer is active.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table:
3. Tests for a magnetic field near the ignition lock cylinder.