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Test Description

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

  1. 3:  Tests for proper operation of the circuit in the high voltage range.
  2. 4:  Tests for a short to ground in the Passlock(tm) sensor signal circuit.
DTC B2957

Step Action Value(s) Yes No
Schematic Reference: Theft Deterrent System Schematics 
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. With a scan tool, observe the Passlock data voltage in the Body Control Module Security Data list.
Does the scan tool indicate that the Passlock(tm) data voltage is within the specified range?		 0.4-4.9 V Go to TESTING FOR INTERMITTENT AND POOR CONNECTIONS Go to Step 3 
3 
  1. Turn OFF the ignition.
  2. Disconnect the Passlock (tm) sensor connector.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the Passlock(tm) data voltage in the Body Control Module Security Data list.
Does the scan tool indicate that the Passlock(tm) data voltage is greater than the specified value?		 4.9 V Go to Step 7  Go to Step 4 
4  Test the Passlock(tm) sensor signal circuit for a short to ground. 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
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  -
7 Inspect for poor connections at the Passlock(tm) sensor. 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 8 
8 Replace the Passlock(tm) sensor in the electronic column lock module assembly. 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 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. Turn ON the ignition, with the engine OFF.
  4. 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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