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PATH:DiagnosticsDiagnostic RoutinesBodyTheft DeterrentDTC P1631

DTC P1631
NOTE
Applicable vehicles:
  • DeVille (VIN K)
  • Seville (VIN K)
  • Seville, Seville RHD (VIN K)

DTC P1631

Circuit Description

The theft deterrent control module produces the theft deterrent fuel and starter enable signal when ignition is ON and the proper transponder key value is detected. The powertrain control module (PCM) monitors the fuel and starter enable signal during crank. If the proper signal is present on the Class 2 Serial Data Circuit, the PCM enables the fuel delivery and starter operation in order to allow the engine to start. If the PCM detects an incorrect password, vehicle theft deterrent (VTD) system failure or attempted vehicle theft, DTC P1631 is set. The engine will not start or crank as long as the condition is present.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The powertrain control module (PCM) detects an incorrect password from the theft deterrent control module.

Actions Taken When the DTC Sets

  • The vehicle will not start.
  • The theft deterrent control module sends a message via the serial data circuit to the instrument cluster to illuminate the SECURITY indicator.
  • The instrument cluster displays STARTING DISABLED and REMOVE KEY message.
  • The powertrain control module (PCM) will not illuminate the malfunction indicator lamp (MIL).
  • The PCM will store conditions which were present when the DTC set as failure records data only. This information will not be stored as freeze frame data.

Conditions for Clearing the MIL/DTC

  • A history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
  • The DTC can be cleared by using a scan tool.

Diagnostic Aids

DTC P1631 indicates that the PCM has detected an incorrect password from the theft deterrent control module. This condition can occur if an incorrect key is being used when attempting to start the vehicle or if the theft deterrent control module has been replaced and the PCMs password learn function has not been enabled.

Test Description

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

  1. Verifies if the condition for setting DTC B2960 is present.
  1. To set this code, the password that the PCM has learned does not agree with the password being received from the theft deterrent control module. This condition can occur if the theft deterrent control module has been replaced and the programming theft deterrent system components procedure has not been performed.
  1. If the PCM resets the DTC after the programming theft deterrent system components procedure has been performed, the theft deterrent control module is malfunctioning.

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 / Is DTC B2960 set as a current code? / Go to DTC B2960 / Go to Step 3
3 / WARNING
Important: If a 10 minute or 30 minute Re-Learn Procedure is performed, all keys not learned at that time will be erased and will not be recognized. Perform the Adding Keys procedure on all keys or instruct the customer how to perform the Adding Keys procedure. Refer to Adding Keys .
Perform the Programming Theft Deterrent System Components procedure. Refer to Programming Theft Deterrent System Components .
Is the procedure complete? / Go to Step 4 / --
4 /
  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 5 / System OK
5 / WARNING
Important: If a 10 minute or 30 minute Re-Learn Procedure is performed, all keys not learned at that time will be erased and will not be recognized. Perform the Adding Keys procedure on all keys or instruct the customer how to perform the Adding Keys procedure. Refer to Adding Keys .
  1. Replace the theft deterrent control module. Refer to Theft Deterrent Module Replacement .
  2. Perform the programming theft deterrent system components procedure. Refer to Programming Theft Deterrent System Components .
Is the replacement complete? / Go to Step 6 / --
6 /
  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 2 / System OK

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Trouble Code: P1631 (4.6L V8 VIN 9 Auto)Theft Deterrent System - Start Enable Signal Not Current
/ Print this code data

Number of Trips to Set Code: 1

OBD II Monitor Type:CCM Details
Indicators:MIL Details

  • CCM Details

Trouble Code Conditions:

Engine cranking and the PCM detected an incorrect VTD password from the VTD system for one second. The PCM controls fuel injector and starter operation based on a vehicle theft deterrent (VTD) password from the Theft Deterrent module. When the ignition is first turned "on", the module sends a programmed password to the PCM. The PCM acknowledges the password and responds to the module that normal fuel injector and starter operation should continue. If the PCM detects an incorrect password due to a VTD system failure or attempted vehicle theft situation, DTC 1631 will set in memory.

Possible Causes:

  • Refer to Programming the Theft Deterrent System
  • Perform the Powertrain Onboard Diagnostic System Check

2002 Cadillac DeVille - Body - Theft Deterrent - DTC P1631

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PATH:DiagnosticsDiagnostic RoutinesBodyTheft DeterrentDTC P1630

DTC P1630
NOTE
Applicable vehicles:
  • DeVille (VIN K)
  • Seville (VIN K)
  • Seville, Seville RHD (VIN K)

DTC P1630

Circuit Description

The theft deterrent control module produces the theft deterrent fuel enable signal when ignition is ON and the proper transponder key value is detected. The powertrain control module (PCM) monitors the fuel enable signal during crank. If the proper signal is present on the Class 2 Serial Data Circuit, the PCM enables the fuel delivery in order to allow the engine to start. If the PCM is replaced, the replacement PCM should learn the password within a few seconds after the ignition is turned ON. DTC P1630 is an information code indicating that the PCM is ready to learn the theft deterrent password. The engine starts and continues to run with DTC P1630 set.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The powertrain control module (PCM) remains in theft deterrent password learn mode for more than 2 seconds.

Actions Taken When the DTC Sets

  • The vehicle will not start.
  • The theft deterrent control module sends a message via the serial data circuit to the instrument cluster to illuminate the SECURITY indicator.
  • The instrument cluster displays STARTING DISABLED and REMOVE KEY message.
  • The powertrain control module (PCM) will not illuminate the malfunction indicator lamp (MIL).
  • The PCM will store conditions which were present when the DTC set as failure records data only. This information will not be stored as freeze frame data.

Conditions for Clearing the MIL/DTC

  • A history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
  • The DTC can be cleared by using a scan tool.

Diagnostic Aids

A replacement powertrain control module (PCM) is in a functional state to learn the password from the theft deterrent control module. If the theft deterrent control module is replaced, the PCM must be placed in password learning mode to relearn the new password. Once learned, the password becomes permanent information that remains with the vehicle. The loss of PCM battery or ignition voltage does not affect the programmed password information. Refer to Programming Theft Deterrent System Components .

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 Programming Theft Deterrent System Components / Go to Diagnostic System Check - Theft Deterrent
Trouble Code: P1630 (4.6L V8 VIN 9 Auto)Theft Deterrent System - Learn Mode Active
/ Print this code data

Number of Trips to Set Code: 1

OBD II Monitor Type:CCM Details
Indicators:MIL Details

  • CCM Details

Trouble Code Conditions:

Engine started; Vehicle Theft Deterrent system has allowed fuel delivery to occur, PCM in theft deterrent password learn mode, and it remained in theft deterrent password learn mode for more than 2 seconds. When the VTD system has been replaced, the password must be relearned using approved diagnostic equipment. If the PCM is replaced, the replacement PCM will learn the password within a few seconds after the ignition is turned ON. DTC P1630 is a code indicating the PCM is ready to learn the VTD password. The engine will start and continue to run with DTC P1630 set.

Possible Causes:

  • Refer to Programming the Theft Deterrent System
  • Perform the Powertrain Onboard Diagnostic System Check

2002 Cadillac DeVille - Body - Theft Deterrent - DTC P1630

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PATH:DiagnosticsDiagnostic RoutinesBodyTheft DeterrentDTC P1631

DTC P1631
NOTE
Applicable vehicles:
  • DeVille (VIN K)
  • Seville (VIN K)
  • Seville, Seville RHD (VIN K)

DTC P1631

Circuit Description

The theft deterrent control module produces the theft deterrent fuel and starter enable signal when ignition is ON and the proper transponder key value is detected. The powertrain control module (PCM) monitors the fuel and starter enable signal during crank. If the proper signal is present on the Class 2 Serial Data Circuit, the PCM enables the fuel delivery and starter operation in order to allow the engine to start. If the PCM detects an incorrect password, vehicle theft deterrent (VTD) system failure or attempted vehicle theft, DTC P1631 is set. The engine will not start or crank as long as the condition is present.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The powertrain control module (PCM) detects an incorrect password from the theft deterrent control module.

Actions Taken When the DTC Sets

  • The vehicle will not start.
  • The theft deterrent control module sends a message via the serial data circuit to the instrument cluster to illuminate the SECURITY indicator.
  • The instrument cluster displays STARTING DISABLED and REMOVE KEY message.
  • The powertrain control module (PCM) will not illuminate the malfunction indicator lamp (MIL).
  • The PCM will store conditions which were present when the DTC set as failure records data only. This information will not be stored as freeze frame data.

Conditions for Clearing the MIL/DTC

  • A history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
  • The DTC can be cleared by using a scan tool.

Diagnostic Aids

DTC P1631 indicates that the PCM has detected an incorrect password from the theft deterrent control module. This condition can occur if an incorrect key is being used when attempting to start the vehicle or if the theft deterrent control module has been replaced and the PCMs password learn function has not been enabled.

Test Description

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

  1. Verifies if the condition for setting DTC B2960 is present.
  1. To set this code, the password that the PCM has learned does not agree with the password being received from the theft deterrent control module. This condition can occur if the theft deterrent control module has been replaced and the programming theft deterrent system components procedure has not been performed.
  1. If the PCM resets the DTC after the programming theft deterrent system components procedure has been performed, the theft deterrent control module is malfunctioning.

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 / Is DTC B2960 set as a current code? / Go to DTC B2960 / Go to Step 3
3 / WARNING
Important: If a 10 minute or 30 minute Re-Learn Procedure is performed, all keys not learned at that time will be erased and will not be recognized. Perform the Adding Keys procedure on all keys or instruct the customer how to perform the Adding Keys procedure. Refer to Adding Keys .
Perform the Programming Theft Deterrent System Components procedure. Refer to Programming Theft Deterrent System Components .
Is the procedure complete? / Go to Step 4 / --
4 /
  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 5 / System OK
5 / WARNING
Important: If a 10 minute or 30 minute Re-Learn Procedure is performed, all keys not learned at that time will be erased and will not be recognized. Perform the Adding Keys procedure on all keys or instruct the customer how to perform the Adding Keys procedure. Refer to Adding Keys .
  1. Replace the theft deterrent control module. Refer to Theft Deterrent Module Replacement .
  2. Perform the programming theft deterrent system components procedure. Refer to Programming Theft Deterrent System Components .
Is the replacement complete? / Go to Step 6 / --
6 /
  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 2 / System OK

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