Antitheft System - Security Telltale Lamp ON/DTC B2960
File in Section: 08 - Body and AccessoriesBulletin No.: 03-08-56-002
Issue Date: September, 2003
Subject:
Intermittent Security Telltale Illumination and/or DTC B2960
(Replace Passlock(TM) Sensor)
Models Affected:
2000-2004 Saturn L-Series Vehicles
Attention: Technician
Condition:
Some customers may comment that the security telltale is coming on intermittently. This may be accompanied by a DTC B2960 set in the Body Control Module (BCM).
Cause:
This condition may be caused by the Passlock(TM) sensor in the ignition lock housing.
Correction:
Refer to the service procedure in this bulletin for diagnosis of the Passlock(TM) system.
Service Procedure:
DTC B2960
Circuit Description
The Passlock(TM) system is provided in order to prevent vehicle theft if the ignition lock cylinder is forced to rotate or the ignition switch is operated while separated from the ignition lock cylinder case. The BCM provides security system sensor power and low reference for the Passlock(TM) sensor. The BCM also measures the security system sensor voltage. When the correct key is used to start the vehicle, a magnet on the lock cylinder passes close to the Passlock(TM) sensor within the ignition lock cylinder case. The magnet activates the security hall effect sensor in the Passlock(TM) sensor which completes a circuit from the security sensor signal circuit through a resistor to the security sensor low reference circuit. The resistance value will vary from vehicle to vehicle. The BCM will measure the voltage on the security sensor signal circuit and compare this voltage to a previously learned voltage. If the voltage measured is within the valid range, the BCM will send a class 2 message to the powertrain control module (PCM) to enable vehicle starting. If the voltage measured is not within the valid range, a class 2 message will be sent to the PCM to disable starting of the vehicle.
Conditions for Setting the DTC
^ The BCM will inspect for a valid code when the ignition is rotated from ON to CRANK and will continue to monitor the signal during the engine running period.
^ The BCM is reading a valid but different code value than previously learned from the Passlock(TM) sensor.
Action Taken When the DTC Sets
^ The vehicle will not start if the fault occurs before you start the vehicle. The security indicator will be FLASHING.
^ If the vehicle is running when the fault occurs, the BCM will be in the tail enable mode allowing the vehicle to start and run. The security indicator will be ON.
Conditions for Clearing the DTC
^ The DTC will clear once an ignition cycle occurs without the fault recurring.
^ The BCM history codes will clear once 100 concurrent ignition cycles occur without the fault recurring.
^ Clear with a scan tool.
Diagnostic Aids
^ Use a scan tool in order to inspect the Passlock(TM) data voltage and the Passlock(TM) code.
^ Inspect for poor connections at the Passlock(TM) sensor. Refer to Testing for Intermittent and Poor Connections in Wiring Systems in the appropriate Saturn L-Series Service Manual.
Test Description
Schematic Reference: Theft Deterrent System Schematics
Diagnostic System Check - Theft Deterrent
Test Description
The numbers refer to the step numbers on the diagnostic table.
2. Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
5. Tests for an open in the Passlock(TM) sensor signal circuit, which may not set a DTC (B2958) under certain conditions.
6. The presence of DTCs which begin with "U" indicate another module is not communicating. The specified procedure will compile all the available information before tests are performed.
7. The presence of DTC P0601, P0602, or P0604 indicates an internal fault in the PCM.
8. The presence of DTC B1000 indicates an internal module fault.
9. The presence of DTC P0562, P0563, or P0621 indicates a low or high voltage condition.
Parts Information:
Claim Information:
To receive credit for this repair during the warranty coverage period, submit a claim through the Saturn Dealer System for E7650 (Module, Ignition Lock Cylinder (Housing) - R&R or Replace).
Disclaimer