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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1425 (Theft Deterrent System) >> Diagnostic Information and Procedures >> DTC P1632: Theft Deterrent Start Disable Signal Received >> Test Description

Test Description

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. 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. 1:  The Powertrain OBD System Check prompts you to complete some of the basic checks and to store the freeze frame and failure records data on the scan tool if applicable. This creates an electronic copy of the data captured when the fault occurred. The scan tool stores this data for later reference.
  2. 2:  The PCM may not have learned the new password. Refer to Password Learn Procedure portion of the service manual.
  3. 4:  The scan tool can display whether or not the BCM has received and learned the password from the lock cylinder. If the password is not received, the reason the PCM set this DTC may be due to a password that has not yet been learned due to a component being replaced or a problem in the BCM or a VTD component.
  4. 5:  Replacement VCMs/PCMs must be reprogrammed. A reprogrammed PCM does not require the password learn procedure to be performed. The password will be learned on the first ignition cycle.
  5. 6:  A Passlock™ theft deterrent, or BCM DTC being set indicates that a Passlock™ component may be malfunctioning.
  6. 7:  If no DTCs were set and the BCM has not learned (received) a password from the ignition lock cylinder, the BCM may need to learn the password, or may be malfunctioning.
  7. 9:  If no malfunctions are present at this point and no additional DTCs were set, refer to Diagnostic Aids for additional checks and information.
DTC P1632 - Fuel Disabled Due to Vehicle Theft Deterrent (VTD)

Step Action Yes No
Schematic Reference: Theft Deterrent System Schematics 
1  Did you perform the Vehicle Theft Deterrent (VTD) Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - Theft Deterrent 
2  Was DTC P1626, or P1631 also set? Go to Diagnostic Trouble Code (DTC) List  Go to Step 3 
3
  1. Perform the Programming Theft Deterrent System Components Procedure. Refer toProgramming Theft Deterrent System Components  .
  2. Attempt to restart the engine.
Does the engine start and continue to run?		 Go to Step 8  Go to Step 4 
4 
  1. Install a scan tool.
  2. Display the data list for the BCM.
Does the scan tool indicate that the Passlock™ Data is Valid?		 Go to Step 5  Go to Step 6 
5 
IMPORTANT: The replacement PCM must be programmed.
Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement in Engine Controls - 4.2L.Is the action complete?		 Go to Step 8  -
6  Invalid data must be coupled with the presence of VTD system DTCs.
Are there any VTD system DTCs set?		 Go to Diagnostic Trouble Code (DTC) List  Go to Step 7 
7 
IMPORTANT: The replacement BCM must be programmed.
Replace the BCM. Refer to Body Control Module Replacement in Body Control System.Is the action complete?		 Go to Step 8  -
8
  1. Using the scan tool, clear the DTCs.
  2. Start engine.
  3. Idle the engine at the normal operating temperature.
  4. Operate the vehicle within the conditions for setting this DTC as specified in the supporting text.
Does the scan tool indicate that this diagnostic ran and passed?		 Go to Step 9  Go to Step 2 
9  Check to see if any additional DTCs are set.
Does the scan tool display any DTCs that you have not diagnosed?		 Go to Diagnostic Trouble Code (DTC) List  System OK
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