For 1990-2009 cars

#### Data Display

The scan tool displays the BCM data. This information assists in determining whether the BCM is operating properly and whether 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 some 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 data from the systems that interact with the BCM.

#### Displayed Input Status

The scan tool also displays the BCM input status. Select the BCM 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 BCM input or an input that is shared with another system.

#### Cycle Outputs

Use a scan tool in order to cycle the BCM output functions. When the BCM output cycling is selected, the scan tool can command the BCM to cycle an output. This feature determines whether the BCM is able to cycle an output regardless of the inputs or any specific program instructions. Once a test is selected, the scan tool will command the BCM to energize the selected output. The scan tool then displays the status of the selected output. The displayed information represents only what was BCM commanded, not what action was actually taken. Verify that the BCM is actually preforming each of the selected output functions.