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Test Description

WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 3:  This step tests for proper operation of the circuit in the high voltage range.
  2. 4:  This step tests for proper operation of the circuit in the low voltage range.
  3. 5:  This step tests for high resistance or an open in the 12-volt reference circuit.
  4. 7:  This step tests for a short to voltage, a high resistance, or an open in the signal circuit.
  5. 8:  This step tests for high resistance or an open in the ground circuit.
DTC B2958

Step Action Values Yes No
Schematic Reference: Immobilizer Schematics 
Connector End View Reference: Immobilizer Connector End Views 
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
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 (BCM) Security Data List.
Does the scan tool indicate that the Passlock™ Data Voltage is within the specified range?		 0.4-4.9 V Go to Testing for Intermittent Conditions and Poor Connections Go to Step 3 
3 
  1. Turn OFF the ignition.
  2. Disconnect the Passlock™ sensor.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool observe the Passlock™ Data Voltage in the BCM Security Data List.
Does the scan tool indicate that the Passlock™ Data Voltage is greater than the specified value?		 4.9 V Go to Step 4  Go to Step 9 
4 
  1. Turn OFF the ignition.
  2. Connect a 3-amp fused jumper wire between the signal circuit of the Passlock™ sensor and the ground circuit of the Passlock™ sensor.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool observe the Passlock™ Data Voltage in the BCM Security Data List.
Does the scan tool indicate that the Passlock™ Data Voltage is less than the specified value?		 0.4 V Go to Step 5  Go to Step 7 
5 
  1. Disconnect the fused jumper wire.
  2. Measure the voltage between the 12-volt reference circuit of the Passlock™ sensor and the ground circuit of the Passlock™ sensor.
Does the voltage measure less than the specified value?		 12 V Go to Step 6  Go to Step 11 
6 Test the 12-volt reference circuit of the Passlock™ sensor for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 14  Go to Step 9 
7  Test the signal circuit of the Passlock™ sensor for a short to voltage, a high resistance, or an open. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 14  Go to Step 8 
8  Test the ground circuit of the Passlock™ sensor for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 14  Go to Step 9 
9 Inspect for poor connections at the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 14  Go to Step 10 
10 Replace the BCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 14  -
11 Inspect for poor connections at the Passlock™ sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 14  Go to Step 12 
12 Replace the Passlock™ sensor in the ignition lock cylinder case. Refer to Ignition Lock Cylinder Case Replacement .
Did you complete the replacement?		 - Go to Step 13  -
13 Perform the Programming Theft Deterrent System Components  procedure.
Is the repair complete?		 - Go to Step 14  -
14
  1. Use the scan tool in order to clear the DTCs.
  2. Turn OFF the ignition.
  3. Momentarily rotate the ignition switch to CRANK. Do not start the vehicle.
  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  Go to Step 15 
15 Attempt to start the vehicle.
Does the engine start and run?		 - System OK Go to Step 3 
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