Body Control Module Diagnostic Information

The body control module (MALL) provides a set of internal service diagnostic features. These features assist the technician in troubleshooting electrical short conditions that may affect the module. If an electrical short occurs during vehicle operation, the MALL module stores one or more codes. These codes are known as history codes. History codes may be accessed by entering the MALL module diagnostic mode. After providing the history codes, the MALL module enters the Input/Output (I/O) Mode. The I/O Mode provides the technician with the ability to verify that the inputs to the MALL module are functioning properly.