GM Service Manual Online
For 1990-2009 cars only

Module Information 1

Manufacture Enable Counter (MEC): The scan tool displays the actual value for the MEC in the BCM. This information is for the assembly plant only.

Module Part Number: The scan tool displays the part number assigned to the BCM that is currently in the vehicle.

Module Information 2

Security Calibration Number: The scan tool displays the security calibration part number in the BCM.

Security Suffix: The scan tool displays the security identification number in the BCM

Security Data

Auto Learn Timer: The scan tool displays the seconds used by the BCM to learn valid code from the Passlock™ sensor. The learn procedure consists of 3 consecutive periods.

Battery Voltage: The scan tool displays the battery system voltage.

Ignition 1: The scan tool displays the state of the ignition switch. The scan tool displays ACTIVE when the ignition switch is in the RUN or CRANK position.

Ignition 3: The scan tool displays the state of the ignition switch. The scan tool displays ACTIVE when the ignition switch is in the RUN position.

Passlock™ Code: The scan tool displays the validity of the Passlock™ code received by the BCM. The scan tool displays OPEN, SHORTED, TAMPER and a valid code as a numeric value (1-10).

Passlock™ Data Voltage: The scan tool displays the voltage code from the Passlock™ sensor to the BCM. The BCM determines if the voltage received is a valid or invalid code voltage.

Passlock™ State: The scan tool displays the state of the Passlock™ system.

Security Lamp State: The scan tool displays the state of the SECURITY lamp. The scan tool displays ON, OFF or FLASHING.

Tamper Timer: The scan tool displays the time remaining when in the tamper mode. The timer starts when the ignition switch is turned to the RUN position and the BCM receives a Passlock™ data voltage different from the last learned voltage. The timer has a delay of 10 minutes and will stay active even if the ignition switch is cycled from the RUN to the OFF position.

VCM Fail Enable: The scan tool displays the state of the VCM/PCM fail enable mode. The scan tool displays YES when the Passlock™ system transitions from the Monitor Passlock™ Data state to the VCM/PCM Fail Enable state.

VCM Fuel Continue: The scan tool displays the state of the VCM/PCM fuel continue mode. The scan tool displays YES when the Passlock™ system verifies a valid password to the BCM.

VCM Learn Timer: The scan tool displays the state of the VCM/PCM learn timer. The scan tool displays INACTIVE when the BCM is not in a learn mode.

VTD Fuel Disable: The scan tool displays the state of the VTD fuel disable mode. The scan tool displays INACTIVE when the Passlock™ system verifies a valid password.

VTD Fuel Disable Until Ignition Off: The scan tool displays the state of the VTD fuel disable until Ignition off mode. The scan tool displays NO when the Passlock™ system verifies a valid password.

VTD Password Learn Mode: The scan tool displays the state of the VTD password learn mode. The scan tool displays INACTIVE when the Passlock™ system is not in a learn mode.