GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2000 🢒 Yukon Denali 🢒 Body and Accessories 🢒 Theft Deterrent 🢒 DTC B2960 Sec Sys Sensor Data Incorrect but Valid

Object Number: 573261 Size: LF
Theft Deterrent System Components
Passlock ™
Variable Effort Steering (00C/K)
Theft Deterrent System Schematic Icons

Circuit Description

The EVO/Passlock™ module will read an analog voltage from the Passlock™ sensor. Based on an internal reference, the EVO/Passlock™ 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 EVO/Passlock™ module will only accept the last learned valid code.

Conditions for Setting the DTC
    • The EVO/Passlock™ module 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 EVO/Passlock™ module is reading a different code value than previously learned from the Passlock™ sensor.

Action Taken When the DTC Sets
    • The vehicle will not run if the fault occurs before the vehicle is started. The security telltale will be flashing.
    • If the vehicle is running when the fault occurs, the EVO/Passlock™ 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
    • The DTC will clear after an ignition cycle has occurred without the fault.
    • EVO/Passlock™ module history codes will be cleared after 100 ignition cycles with no current codes active.
    • Using a scan tool

Diagnostic Aids
    • When replacing the Passlock™ sensor, all the sensor components; the lock, the sensor, the filter, and the harness, are included as a replacement part and must be replaced.
    • Use the scan tool in order to test the Passlock™ data voltage and the Passlock™ code.
    • Perform a visual inspection of the wiring and the connectors.
    • Inspect the Passlock™ 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 in Wiring Systems.

Test Description

The numbers below refer to the step numbers on the diagnostic table:

  1. Tests for the proper operation of the circuit in the normal voltage range.

Step

Action

Value(s)

Yes

No

1

Did you perform the Theft Deterrent (VTD) Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Theft Deterrent

2
  1. Install a scan tool.
  2. Momentarily rotate the ignition switch to CRANK (do not start the vehicle).
  3. Release the ignition switch to ON.
  4. Select the body control module display DTCs function on the scan tool.

Does the scan tool display DTC B2960 as a current DTC?

--

Go to Step 3

Go to Diagnostic Aids

3

Does the scan tool display DTC B2947, B2948, B2957, or B2958?

--

Go to DTC List

Go to Step 4

4

Have you replaced the Passlock™ sensor on this vehicle?

--

Go to Step 5

Go to Step 6

5

Have you performed a Passlock™ learn procedure after replacing the Passlock™ sensor?

--

Go to Step 6

Go to Step 9

6

With a scan tool, observe the Passlock™ data voltage for one minute.

Does the scan tool indicate that the Passlock™ data voltage is changing more than the specified value?

+/- 0.02v

Go to Step 7

Go to Step 9

7

Inspect for poor connections at the Passlock ™ sensor.

Did you find and correct the condition?

--

Go to Step 10

Go to Step 8

8

Replace the Passlock™ sensor in the electronic column lock module assembly.

    • With Tilt Wheel and Column Shift
       - 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.
    • With Tilt Wheel and Floor Shift
       - 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.
    • With Standard Wheel and Column Shift
       - 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.
    • With Standard Wheel and Floor Shift
       - 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 9

--

9

Perform one of the following Passlock™ learn procedures:

    •  PASSLOCK Reprogramming Seed and Key (10 minutes).
    •  PASSLOCK Reprogramming Auto Learn (30 minutes).

Is the repair complete?

--

Go to Step 10

--

10
  1. Use the scan tool in order to clear the DTCs.
  2. Turn OFF the ignition
  3. Momentarily rotate the ignition switch to CRANK (do not start the vehicle).
  4. Release the ignition switch to ON.
  5. Select the body control module display DTCs function on the scan tool.

Does the DTC reset?

--

Go to Step 3

System OK