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Test Description

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The number below refers to the step number on the diagnostic table.

  1. 6:  Tests for the proper operation of the circuit in the normal voltage range.
DTC B2960

Step Action Value(s) Yes No
Schematic Reference: Theft Deterrent System Schematics 
Connector End View Reference: Theft Deterrent System Connector End Views 
1 Did you perform the Vehicle 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 (BCM) display DTCs function on the scan tool.
Does the scan tool display DTC B2960 as a current DTC?		 - Go to Step 3  Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
3 Does the scan tool display DTC B2947, B2948, B2957, or B2958? - Go to Diagnostic Trouble Code (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?		 +/- 0.02 V Go to Step 7  Go to Step 9 
7 Inspect for poor connections at the Passlock™ sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 10  Go to Step 8 
8 Replace the Passlock™ sensor in the ignition lock cylinder case. Refer to Ignition Lock Cylinder Case Replacement in Steering Wheel and Column.
Did you complete the replacement?		 - Go to Step 9  -
9 Perform the Programming Theft Deterrent System Components  procedure.
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. IMPORTANT: Do not start the vehicle.
  3. Momentarily rotate the ignition switch to CRANK.
  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
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