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Test Description

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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
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 AND POOR CONNECTIONS
3 
IMPORTANT: The use of a DMM is crucial in this step because voltage may be measured for 10 milliseconds.
  1. Disconnect the Passlock(tm) sensor connector.
  2. Connect a DMM between the Passlock(tm) 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 .
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 AND POOR CONNECTIONS and CONNECTOR REPAIRS .
Did you find and correct the condition?		 Go to Step 10  Go to Step 6 
6 Inspect for poor connections at the Passlock(tm) sensor. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS .
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 .
Replace the body control module. Refer to BODY CONTROL MODULE REPLACEMENT .Did you complete the replacement?		 Go to Step 10  -
8 Replace the Passlock(tm) sensor. Refer to ELECTRONIC COLUMN LOCK MODULE - DISASSEMBLE - OFF VEHICLE and ELECTRONIC COLUMN LOCK MODULE - ASSEMBLE - OFF VEHICLE .
Did you complete the replacement?		 Go to Step 9  -
9 Perform the Passlock(tm) 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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