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

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.

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.

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.

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

Action Taken When the DTC Sets

Conditions for Clearing the MIL/DTC

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.