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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 990 (Theft Deterrent System) >> Diagnostic Information and Procedures >> DTC B2948 >> Test Description

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. 3:  Tests for a short to battery positive on the Passlock battery voltage circuit.
DTC B2948

Step Action Yes No
Schematic Reference: Theft Deterrent System Schematics 
Connector End View Reference: Theft Deterrent System Connector End Views 
1 Did you perform the Theft Deterrent Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - Theft Deterrent 
2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Select the body control module display DTCs function on the scan tool.
Does the scan tool display DTC B2948 as a current DTC?		 Go to Step 3  Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
3 
IMPORTANT: The use of a DMM is crucial in this step because voltage may be measured for 10 milliseconds.
  1. Disconnect the Passlock™ sensor connector.
  2. Connect a DMM between the Passlock™ battery voltage circuit and a good ground.
  3. Set the "MIN MAX" mode to the 1 millisecond peak and start to record.
  4. Turn OFF the ignition.
  5. Stop recording and review the recorded "MIN" value.
Does the voltage measure near zero volts?		 Go to Step 7  Go to Step 4 
4 Test the Passlock battery voltage circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 10  Go to Step 5 
5 Inspect for poor connections at the BCM. 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 6 
6 Inspect for poor connections at the Passlock™ sensor. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Did you find and correct the condition?		 Go to Step 10  Go to Step 8 
7
IMPORTANT: When replacing the BCM, refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System.
Replace the body control module. Refer to Body Control Module Replacement in Body Control System.Did you complete the replacement?		 Go to Step 10  -
8 Replace the Passlock™ sensor. Refer to Ignition Lock Cylinder Replacement in Steering Wheel and Column.
Did you complete the replacement?		 Go to Step 9  -
9 Perform the Passlock™ learn procedure. Refer to Programming Theft Deterrent System Components .
Did you complete the repair?		 Go to Step 10  -
10
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the conditions for running the DTC as specified in the supporting text.
Does the DTC reset?		 Go to Step 3  System OK
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