Typical Scan Tool Data Definitions

The scan tool readings of the Passlock (TM) System will assist in diagnosing a problem.

The Typical Scan Tool Data Definitions represent general information displayed on the scan tool regarding, Passlock (TM) System functions, ignition inputs, and basic Passlock (TM) operating conditions.

The Data Messages and Menu Headings displayed on the scan tool are as follows:

Module Information

Security Calibration Number - Range: 16XXXXXX
This information refers to the security Calibration Part Number in the Body Control Module (BCM).

Security Suffix - Range: AA - ZZ
This information refers to the Security Calibration Identification Number in the BCM.

Module Part Number - Range: 16XXXXXX
This information refers to the Part number assigned to the BCM currently in the vehicle.

Manufacturers Enable Counter - Range: 0 - 255
This information refers to the actual value for the Manufacturers Enable Counter (MEC) in the BCM. This information is for assembly plant use only.

Data

Ignition 1 - Rang.: ACTIVE / INACTIVE
The BCM uses this data to determine the position of the ignition switch. ACTIVE is displayed when the ignition switch is in the RUN or CRANK position. INACTIVE is displayed when the ignition switch is not in the RUN or CRANK position.

Ignition 3 - Range: ACTIVE / INACTIVE
The BCM uses this data to determine the position of the ignition switch. ACTIVE is displayed when the ignition switch is in the RUN position only. INACTIVE is displayed when the switch is not in the RUN position.

Battery Voltage - Range: 9.0 Volts - 16 Volts
The voltage value displayed refers to the battery system voltage measured by the BCM on circuit 1140.

Passlock (TM) Power - Range: ACTIVE / INACTIVE
The BCM supplies 12 Volts and a ground for the Passlock (TM). The Passlock (TM) power will be active whenever the BCM is awake. The BCM can take up to 20 minutes to power down after the ignition switch is turned to the OFF position. There may be a momentary loss of voltage at the Passlock (TM) sensor when the ignition switch is turned OFF. This is a normal occurrence due to the BCM internal self test when the ignition switch is turned OFF.

Passlock (TM) Data Voltage - Range: 0.0 Volts - 5.0 Volts
The Passlock (TM) Data voltage displayed indicates the return voltage from the Passlock (TM) sensor to the BCM. The BCM also determines if the voltage received is a valid voltage window or an invalid voltage window. There are 10 valid voltage windows an OPEN voltage window, a TAMPER voltage window, and a SHORTED voltage window. The value displayed on the scan tool will be from 0.0 Volts to 5.0 Volts. The BCM converts this analog voltage to a class 2 serial data password which is then sent to the PCM/VCM. The PCM/VCM must receive the same password that was learned in the last learn procedure. It the PCM/VCM does not receive a valid password from the BCM, then the PCM/VCM will not enable the fuel injection system. Refer to the Passlock (TM) Learn Procedure.

Passlock (TM) State - Range: IGNITION OFF / TAMPER / FAIL ENABLE / FAIL ENABLE DEC / SEEDKEY LRN PEND / SEEDKEY LEARN / AUTO LEARN PEND / LEARN PASSLOCK / MONITOR PASSLOCK / NORMAL DECISION / AUTO LEARN.
The indication displayed refers to the state of the Passlock (TM) system.

Passlock (TM) Code - Range: OPEN / SHORTED / TAMPER / NUMERIC
The Passlock (TM) Code displayed indicates the internal Passlock (TM) sensor resistance value. The BCM also determines if the Passlock (TM) Code received is a valid Passlock (TM) code or an invalid Passlock (TM) code. There are 10 valid Passlock (TM) codes, an OPEN Passlock code, a TAMPER Passlock (TM) code, and a SHORTED Passlock (TM) code. The scan tool will display any valid Passlock (TM) code as a numeric value. The value displayed on the scan tool will be 1 through 10 (i.e. Valid Code 7), SHORTED, TAMPER or OPEN.

Tamper Timer - Range: 0-600 Seconds
The Tamper Timer is used as part of the interactive procedure to allow the BCM to display the time remaining when in the tamper mode. The Tamper timer will start when the ignition switch is turned to the RUN position and the BCM receives a Passlock (TM) data voltage which is different from the last learned Passlock (TM) data voltage.

The Tamper Timer has a Lockout Timer (approximately 10 minutes), this is the time the vehicle must remain in the Tamper Mode even if the ignition switch is turned from the RUN position to the OFF position.

Auto Learn Timer - Range: 0-600 Seconds
The Auto Learn Timer is used as part of the interactive procedure to allow the BCM to learn valid Passlock (TM) Data from the Passlock (TM) sensor. The Learn procedure consists of 3 consecutive Lockout Cycles (approximately 30 minutes). The Auto Learn Timer will not display the time in which the PCM/VCM is in the Lockout Mode.

Security Lamp State - Range: ON / OFF / FLASHING
The Security Lamp will turn ON steady for 3 seconds and then turn OFF when the ignition switch is turned from the OFF position to the RUN position. The security telltale will have 3 states, OFF, ON STEADY and FLASHING. If the IPC can not communicate with the BCM the security telltale will stay ON STEADY (after the bulb check) and the Passlock (TM) system WILL function (if Class 2 Communication is possible). The security telltale will FLASH momentarily and then turn ON STEADY (approximately 10 minutes) if the vehicle is in the Lockout Cycle. The Passlock (TM) system requires 3 consecutive Lockout Cycles to complete the 30 minutes learn procedure for a changed component. A 10 minutes Learn Procedure is also available. Refer to Passlock (TM) Learning Procedures.