GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1999 🢒 Chevy K Pickup - 4WD 🢒 DTC 🢒 DTC B3031 Security System Controller in Learn Mode

Object Number: 381555 Size: LF
Theft Deterrent System Components
Theft Deterrent System Schematics Vehicle Theft Deterrent
Variable Effort Steering
Theft Deterrent System Schematic Icons
Theft Deterrent System Schematic Icons

Circuit Description

In this mode, the EVO/Passlock module will learn the current Passlock sensor code value. The following list is the 2 Passlock learn procedures:

    • A 10 minute procedure that requires a Techline terminal.
    • A 30 minute learn procedure that requires a scan tool in order to clear the codes.

Conditions for Setting the DTC
    • A new (never installed in a vehicle) EVO/Passlock module has been installed and the ignition is turned to ON but is not rotated to crank. Once the ignition switch has been rotated to crank, the EVO/Passlock module will learn the Passlock code.
    • The EVO/Passlock module is in the learn mode but does not see a valid Passlock sensor code because of a sensor or a wiring problem.

Actions Taken When the DTC Sets

The vehicle will not run and the security telltale will be ON.

Conditions for Clearing the DTC
    • The DTC will clear after an ignition cycle has occurred after the EVO/Passlock module has learned a valid code.
    • EVO/Passlock module history codes will be cleared after 100 ignition cycles with no current codes active.
    • Using a scan tool.

Diagnostic Aids
    • Prior to replacing a EVO/Passlock module ensure all the diagnostics have been completed. If the EVO/Passlock module has been replaced with an existing system condition, the replacement EVO/Passlock module will not learn a new voltage code (DTC B3031) until the original condition has been repaired.
    • Perform a visual inspection of the wiring and the connectors.
    • Inspect the Passlock sensor harness for an intermittent or poor connections (including the in-line connector). Refer to Intermittents and Poor Connections .

Test Description

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

  1. The EVO/Passlock module learns an analog voltage code when the ignition switch is turned to the crank position. If a Passlock module is replaced and the ignition is turned to the ON position, DTC B3031 will set until the module sees a crank switch position or until the Passlock sensor has latched.

    2.

  2. Turning the ignition switch to crank will reset DTC B3031 in a new module.

    3.

  3. If a conditions in 1 of the following circuits, troubleshoot the appropriate DTC prior to diagnosing DTC B3031:

    4. • CKT 812
    • CKT 1836
    • CKT 1057

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 EVO/Passlock module recently been replaced?

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Go to Step 3

Go to Step 4

3

Turn the ignition switch to crank and the back to the ON position. In the crank position the EVO/Passlock module will receive an analog voltage code from the sensor.

Is the operation complete?

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Go to Diagnostic System Check - Theft Deterrent

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4
  1. Connect a scan tool.
  2. Read the Passlock system current diagnostic trouble codes (DTCs).
  3. Inspect for the following DTCs:
    4. • DTC B2947
    • DTC B2948
    • DTC B2957
    • DTC B2958

Is 1 or more of the DTCs set?

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Go to Diagnostic Trouble Code (DTC) Displaying

Go to Step 5

5

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?

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Go to Step 7

Go to Step 6

6

Replace the EVO/Passlock module. Refer to Theft Deterrent Module Replacement .

Is the repair complete?

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Go to Step 7

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7
  1. Reconnect all the previously disconnected connectors and the components.
  2. Turn the ignition switch ON.
  3. Connect the scan tool.
  4. Clear the DTCs.
  5. Perform 1 of the following Passlock reprogramming procedures:

Is the repair complete?

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Go to Diagnostic System Check - Theft Deterrent

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