The scan tool displays UTD data. This information assists in determining if the BCM is able to receive the correct data to operate the UTD system. By monitoring the data from various systems, it will determine if the BCM is sending or receiving the proper data to and from a particular system. The BCM uses data received from other systems in order to carry out UTD functions. Therefore, if the BCM receives the incorrect data from another system, the BCM may function improperly. Use the scan tool in order to review the UTD data from the system or systems responsible for that UTD data. The following table describes where to access scan tool data that affects UTD operation Refer to the applicable section for scan tool data definitions:

The scan tool displays UTD input status. Select the appropriate system's input status display in order to display the data and determine if the switched inputs can be properly interpreted. The display also indicates if the input has changed states. For example, when a door is closed, the scan tool displays the input status of the door ajar switch as INACTIVE. When the door is open, the scan tool reads ACTIVE. Use this kind of information when diagnosing a malfunction associated with a particular UTD input or an input that is shared with another system. The following table describes where to access scan tool input information that affects UTD operation. Refer to the applicable section for scan tool input definitions:

Use a scan tool in order to cycle UTD output functions. When the output cycling is selected, the scan tool can command the applicable system to cycle an output ON or OFF. This feature can be used to determine if the UTD system is causing the malfunction or if the system responsible for controlling that output is the cause. These outputs can be cycled regardless of the inputs or any specific program instructions. Once a test is selected, the scan tool will command a specific system to energize the selected output. The scan tool then displays the status of the selected output. The displayed information represents only what was commanded, not what action was actually taken. The following table describes where to access scan tool special functions that are used in UTD operation: