B2958

DTC B2958

CIRCUIT DESCRIPTION




The Passlock(TM) system is provided in order to prevent vehicle theft if the ignition lock cylinder is forced to rotate. The Passlock(TM) controller reads the coded Passlock(TM) data signal. The data consists of a voltage generated by a voltage divider network created between the Passlock(TM) assembly and the Passlock(TM) controller. If the data is correct , indicating rotation of the lock cylinder with the proper mechanically cut key, then the Passlock(TM) controller sends a password to the Powertrain controller over the class 2 bus to indicate that starter engagement should be allowed. The Passlock(TM) controller also interfaces with the driver displays subsystem to indicate, via a Security telltale, the Passlock(TM) subsystem's status and acute subsystem failures.

CONDITIONS FOR SETTING THE DTC
- The ignition switch is ON.
- The body control module (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 indicator 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
- 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 Diagnostic Aids for Circuit Testing and Wiring Repair procedures.
- 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

Steps 1-11:

Steps 12-15:

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 5-volt 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.