LW2 V6-3.0L VIN R (2000)
Ignition Shut Down Relay (For Antitheft): All Technical Service Bulletins
Antitheft System - Security Telltale Lamp ON/DTC B2960
File in Section: 08 - Body and Accessories
Bulletin 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.
