For 1990-2009 cars

# Security Indicator Illuminated or Flashing, Engine Starts then Stalls and/or Disabled for 10 Minutes, Diagnostic Trouble Code P1632 Set (Follow Bulletin Diagnostic Table)

Subject: | Security Indicator Illuminated or Flashing, Engine Starts then Stalls and/or Disabled for 10 Minutes, Diagnostic Trouble Code (DTC) P1632 Set (Follow Bulletin Diagnostic Table)

Models: | 2000-2002 Saturn S-Series Vehicles

Attention: | Fixed Operations Manager and Technician

### Condition

Some customers may comment that the security indicator is illuminated or flashing and the engine starts then stalls immediately and/or is disabled for 10 minutes. DTC P1632 is set.

### Cause

An incorrect password or no password may have been received by the PCM, which may cause DTC P1632 to be set. The incorrect or no password may be caused by communication issues between the PCM and BCM.

### Correction

Important: Please insert this bulletin into the 2000-2002 Saturn S-Series Engine Service Manual, Vol. 1 immediately after the diagnostic charts for DTC P1631 on page 315.

Follow the diagnostic procedures included in this bulletin to clear DTC P1632 and restore full communication between PCM and BCM.

### DTC P1632

Circuit Description

The powertrain control module (PCM) controls the fuel injector operation based on a vehicle theft deterrent (VTD) password from the vehicle body control module (BCM). When the ignition is first turned ON, the BCM sends a programmed theft deterrent password to the PCM. The PCM acknowledges the password and responds to the BCM allowing normal fuel injector operation to continue. When starting the engine, the PCM looks for a password from the BCM through the Class 2 serial data circuit. If the password is not recognized or not present, the PCM will disable the fuel injectors and the engine will start and stall immediately. The Security indicator will flash on the instrument panel cluster (IPC) for approximately 4 seconds. If an incorrect or disable password is received more than three times, the engine is disabled for at least 10 minutes and the Security indicator will illuminate solid on the IPC for approximately 3 seconds then flash on the IPC for 10 minutes. If the PCM loses communication with the BCM within the same ignition cycle, the vehicle will enter fail-enable mode and continue to start and run on the following ignition cycles.

Conditions for Running the DTC

The ignition is cycled to ON.

Conditions for Setting the DTC

• | An incorrect password is received by the PCM.

• | No password is received by the PCM.

Action Taken When the DTC Sets

• | The PCM will record operating conditions at the time during which the diagnostic fails. This information will be stored in the Freeze Frame and Failure Records buffers.

• | The fuel system is disabled by the PCM.

Conditions for Clearing the MIL/DTC

• | A history DTC will clear after 40 consecutive warm up cycles without a fault.

• | A scan tool can clear current and history DTCs.

Diagnostic Aids

Attempting to start the vehicle by bypassing the Passlock™ system or by substituting parts without performing the Passlock™ Programming procedure may set a DTC P1631 and/or a P1632. If no password is received, a DTC U1064 may also set.

All U-code and B-code DTCs should be diagnosed prior to diagnosing DTC P1632.

Test Description

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

2. If DTCs P1626 and/or P1631 are also set, they should be diagnosed prior to the diagnosis of DTC P1632.

4. The scan tool displays the actual voltage code sent from the Passlock™ cylinder. This voltage should be within 0-5 volts.

5. Theft deterrent B-code (DTC B2957, B2958, or B2960) may set if Passlock™ data voltage is not within specifications. These DTCs should be diagnosed prior to diagnosing DTC P1632.

Step | Action | Yes | No
--- | --- | --- | ---
1 | Did you perform a Diagnostic Starting Point - Theft Deterrent? | Go to Step 2 | Go to Diagnostic Starting Point - Theft Deterrent
2 |

1. Install a Tech 2 Scan Tool.
2. Turn ON the ignition with the engine OFF.
3. Select the Display DTCs function for the PCM.

Does the scan tool display DTC P1626 or DTC P1631?

Go to DTC List

Go to Step 3

3 |

1. Perform the Passlock™ Programming procedure. Refer to Passlock™ Programming procedure .
2. Attempt to start the engine.

Does the engine start and continue to run?

Go to Step 8

Go to Step 4

4 |

1. Display the Security Data list for the BCM.
2. Observe the PASSLOCK DATA VOLTAGE parameter.

Does the scan tool indicate that the Passlock™ Data voltage is within 0-5 volts?

Go to Step 5

Go to Step 6

5 | Important: When replacing the PCM, perform the programming procedure. Refer to Powertrain Control Module (PCM) Programming . Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement . Did you complete the replacement? | Go to Step 8 | -
6 | Invalid data will set a theft deterrent B-code. Refer to DTC List. Are there any theft deterrent B-codes set? | Go to DTC List | Go to Step 7
7 | Replace the BCM. Refer to Body Control Module Replacement in Body Control Systems. Did you complete the replacement? | Go to Step 8 | -
8 |

1. Using the scan tool, clear the DTCs.
2. Start the engine.
3. Idle the engine at the normal operating temperature.

Does DTC P1632 reset?

Go to Step 2

System OK