Use a scan tool in order to read the body control module (BCM) status of inputs and outputs. Use this information in order to verify that the BCM is sending and receiving the proper data. The BCM uses data received from other vehicle systems in order to carry out some functions. If the BCM receives the incorrect data from another vehicle system, the BCM may function improperly. Use the scan tool in order to review the data coming from the inputs and the vehicle systems that interact with the BCM.

When a door is closed, the scan tool displays the input status of the door ajar switch as on . When the door is open, the scan tool reads ACTIVE.

Use this type of information when diagnosing a malfunction associated with a particular BCM input, or an input that is shared with another vehicle system.

Use a scan tool in order to cycle the BCM outputs. Refer to the scan tool user's manual for menu navigation instructions.

Use this feature in order to determine if the BCM is able to activate an output, regardless of BCM inputs. Use a scan tool in order to select a BCM output and command the BCM to activate the output. The scan tool then displays the status of the selected output. The status information represents only what the BCM has commanded, not what action was actually taken. Verify that the BCM is performing each of the selected output functions.