B2958

Diagnostic Chart (Part 1 Of 2):

Diagnostic Chart (Part 2 Of 2):

Schematic:

CIRCUIT DESCRIPTION
The body control module (BCM) will read an analog voltage form the Passlock(TM) sensor. Based on an internal reference, the BCM will determine if the measured voltage is in one of the following conditions:
- Open
- Shorted to ground
- A valid code
- A tamper code

There are 10 possible valid code combination. The BCM will only recognize the last learned valid code.

CONDITIONS FOR SETTING THE DTC
- The ignition switch is ON.
- The BCM signal input is greater than 4.9 volts for 1 second after turning the ignition switch to the CRANK position.

ACTION TAKEN WHEN THE DTC SETS
- The DTC will set only when the engine is running
- The BCM will be in the fail enable mode allowing the vehicle to start and run.
- The security telltale will be ON.

CONDITIONS FOR CLEARING THE DTC
- The current DTC will clear once an ignition cycle has occurred without the fault recurring.
- After 100 concurrent ignition cycles occur without the fault recurring, a history DTC clears.
- Using a scan tool.

DIAGNOSTIC AIDS
- When replacing the Passlock(TM) sensor, all of the following components are included as a replacement part and must be replaced:
- The lock
- The sensor
- The filter
- The harness
- Use a scan tool in order to inspect the Passlock(TM) data voltage and the Passlock(TM) code.
- Inspect the Passlock(TM) sensor harness for an intermittent or a short to battery. Refer to Testing for Intermittent and Poor Connections in Wiring Systems.
- You may be directed to this table from the VTD Diagnostic System Check without a DTC B2958 being set. If you were directed to this table, follow all of the steps in this diagnostic table.
- When directed to this table, DTC B2958 may have a history status.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
3. Tests for proper operation of the circuit in the high voltage range.
4. Tests for proper operation of the circuit in the low voltage range.
5. Tests for high resistance or an open in the 12 v reference circuit.
7. Tests for a short to voltage, a high resistance, or an open in the signal circuit.
8. Tests for high resistance or an open in the ground circuit.