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

Accessory (Ignition 0)
The BCM uses this data in order to determine the position of the ignition switch. ON is displayed when the ignition switch is in the Run or ACCY position.

Battery Voltage
This voltage value refers to the battery system voltage.

Brake Fluid Level Switch
The BCM uses this input to determine the position of the brake fluid level switch. ON is displayed when a low brake fluid condition exists.

Decklid Release
This data shows the status of the Deck Lid release output.

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

Ignition 1
The BCM uses this data in order to determine the position of the ignition switch. ON 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. ON 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. ON 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.

Low Coolant Level
The BCM uses this input to determine the position of the coolant level switch. ON is displayed when a low coolant level condition exists.

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

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.

Panic Horn Relay Feedback
This input displays the state of the horn relay. When the horn switch is pressed, ACTIVE is displayed.

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.

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