Scan Tool Data Definitions

Use the Scan Tool Data Display Values and Definitions Information in order to assist in diagnosing vehicle malfunctions. Compare the vehicles actual scan tool data with the typical data display value table information. Use the data information in order to aid in understanding the nature of the problem when the vehicle does not match with the typical data display values.

The scan tool data values were taken from a known good vehicle under the following conditions:

• The ignition switch is in the ON position.
• The engine is not running.
• The vehicle is in PARK.

A/C Clutch Mode:  The BCM acquires the mode that the A/C clutch is in and sends the mode data over the Class 2 serial data circuit.

A/C Request:  The BCM uses this input to determine the position of the air conditioning switch. YES is displayed when A/C is requested.

BCM Option config. No.:  This data is the BCM option configuration data.

Calibration ID:  This information refers to how the BCM is calibrated. This information is for assembly plant use only.

Ignition 0:  The BCM uses this data in order to determine the position of the ignition switch. Active is displayed when the ignition switch is in the Run or ACCY position.

Ignition 1:  The BCM uses this data in order to determine the position of the ignition switch. Active is displayed when the ignition switch is in the Run or CRANK position.

Ignition 3:  The BCM uses this data in order to determine the position of the ignition switch. Active is displayed when the ignition switch is in the Run position.

Key In Ignition:  This information refers to whether or not the ignition key is inserted into the ignition switch. The BCM uses this data to perform chime functions. Yes is displayed when the key is inserted into the ignition switch.

Last 4 Dig. of GM Part #:  This information refers to the last 4 digits of the GM BCM part number that is currently in the vehicle.

Last 4 Digits of SDM Part Number:  This is the last four digits of the vehicles onboard SDM part number.

Model Year:  This information refers to the model year of the vehicle.

Seat Belt:  This Data indicates the status of the Seat belt.

Turn Signal Switch:  The BCM monitors the Turn signal Indicator Switch and transmits the appropriate message for the position.

Panic Horn Relay:  This output displays whether or not the BCM is providing ground for the horn relay. ON is displayed when the BCM is providing ground for the relay.

Park Brake Switch:  The BCM uses this input to determine the position of the rear park brake switch. ON is displayed when the park brake is applied.

Washer Fluid Level:  The BCM has a discreet input for monitoring the Windshield Washer Fluid level, and transmits the data over the Class 2 serial data circuit.

Year Module Built:  This information refers to the year that the BCM was built.