GM Service Manual Online
For 1990-2009 cars only
Makes šŸ¢’ GMC_Truck šŸ¢’ 2000 šŸ¢’ Savana šŸ¢’ Body and Accessories šŸ¢’ Theft Deterrent šŸ¢’ DTC B2960 Sec Sys Sensor Data Incorrect but Valid

Object Number: 573247 Size: LF
Theft Deterrent System Components
Theft Deterrent System Schematics Passlock
Theft Deterrent System Schematic Icons
GAUGES Fuse, Fuel Sender Buffer Module, Low Engine Coolant Level Indicator Module, Low Engine Coolant Indicator Sensor, G103, G201, G209

Circuit Description

The Passlockā„¢ Module will read an analog voltage from the Passlockā„¢ Sensor. Based on an internal reference, the Passlockā„¢ Module will determine if the measured voltage is open, shorted to ground, a valid code, or a tamper code. There are 10 possible valid code combinations. The Passlockā„¢ Module will only accept the last learned valid code.

Conditions for Setting the DTC
    ā€¢ The Passlockā„¢ Module will inspect for a valid code when the ignition is rotated from ON to crank.
    ā€¢ The Passlockā„¢ Module is reading a different code value than previously learned from the Passlockā„¢ Sensor.

Action Taken When the DTC Sets
    ā€¢ The vehicle will not run if the fault occurs before the vehicle is started. The security telltale will be flashing.
    ā€¢ If the vehicle is running when the fault occurs, the Passlockā„¢ Module will be in the fail enabled mode allowing the vehicle to start and run. The security telltale will be ON.

Conditions for Clearing the DTC
    ā€¢ The DTC will clear after an ignition cycle has occurred without the fault.
    ā€¢ Passlockā„¢ Module history codes will be cleared after 100 ignition cycles with no current codes active.
    ā€¢ Using a scan tool

Diagnostic Aids
    ā€¢ When replacing the Passlockā„¢ Sensor, all the sensor components; the lock, the sensor, the filter, and the harness, are included as a replacement part and must be replaced.
    ā€¢ Use the scan tool in order to test the Passlockā„¢ data voltage and the Passlockā„¢ code.
    ā€¢ Perform a visual inspection of the wiring and the connectors.
    ā€¢ Inspect the Passlockā„¢ Sensor harness and the filter for an intermittent or poor connections (including the in-line connector). Refer to Testing for Intermittent Conditions and Poor Connections .

Test Description

The numbers below refer to the numbers on the diagnostic table.

  1. If the Passlockā„¢ Sensor has been replaced without the Passlock Learning Procedure, DTC B2960 will set.

    2.

  2. This step will determine if the problem is in the Passlockā„¢ Sensor or the Passlockā„¢ Module. A 5 volt signal is normal for the Passlockā„¢ signal input with the Passlockā„¢ Sensor disconnected.

Step

Action

Value(s)

Yes

No

1

Did you perform the VTD Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Theft Deterrent

2

Has the Passlock sensor just been replaced?

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Go to Step 6

Go to Step 3

3

  1. Turn the ignition switch ON.
  2. Disconnect the Passlockā„¢ sensor connector.
  3. Connect a DMM between the Passlockā„¢ sensor connector terminal 3 and terminal 2.

Is the voltage reading within the specified range?

4.9-5.0 volts

Go to Step 5

Go to Step 4

4
  1. Remove the jumper.
  2. Replace the Passlockā„¢ Module. Refer to Theft Deterrent Module Replacement .

Is the repair complete?

--

Go to Step 6

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5
  1. Remove the jumper.
  2. Replace the Passlockā„¢ Sensor in the electronic column lock module assembly.
    3. ā€¢ With Tilt Wheel
       - To disassemble the lock module assembly, refer to Electronic Column Lock Module - Disassemble - Off Vehicle in Steering Wheel and Column - Tilt.
       - To assemble the lock module assembly, refer to Electronic Column Lock Module - Assemble - Off Vehicle in Steering Wheel and Column - Tilt.
    ā€¢ With Standard Wheel
       - To disassemble the lock module assembly, refer to Electronic Column Lock Module - Disassemble - Off Vehicle in Steering Wheel and Column - Standard.
       - To assemble the lock module assembly, refer to Electronic Column Lock Module - Assemble - Off Vehicle in Steering Wheel and Column - Standard.

Is the repair complete?

--

Go to Step 6

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6
  1. Reconnect all the previously disconnected connectors and the components.
  2. Ensure that the ignition switch is ON.
  3. Connect the scan tool.
  4. Clear the DTCs.
  5. Perform one of the following Passlockā„¢ reprogramming procedures:

Is the repair complete?

--

Go to Diagnostic System Check - Theft Deterrent

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