DeVille d Elegance V8-4.6L VIN Y (1998)
Body Control Module: Scan Tool Testing and Procedures
Control Outputs
Use a scan tool in order to control the module output functions. When the module output control is selected, the scan tool can command the module to
turn an output on or off. This feature may be used in order to determine if the module is able to control an output regardless of the inputs or any specific
program instructions. Once a test is selected, the scan tool will command the module to energize the selected output. The scan tool then displays the
status of the selected output. The displayed information represents only what was module commanded, not what action was actually taken. Verify that the
module is actually performing each of the selected output functions. It may be necessary to have the ignition in the RUN position in order to control the
outputs.
Data Display
The scan tool displays the module data. This information assists in determining whether the module is operating properly and whether the module is
sending or receiving the proper data to and from a particular system. The module uses data received from other systems in order to carry out some
functions. Therefore, if the module receives the incorrect data from another system, the module malfunction improperly. Use the scan tool in order to
review the data from the systems that interact with the module.
Displayed Input/Output Status
The scan tool also displays the module input/output status. Select the module input/output status display in order to display the data and determine if the
switched inputs/outputs can be properly interpreted. The display also indicates if the input/output 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 module input or an input that is shared with another system.
