Input/Output Diagnostics

After all diagnostic codes have been displayed the MALL subsystem provides individual input and output diagnostic checks for all functions. For example, if the Driver Door is opened and then closed the system provides feedback of a single flash and bong for the opening operation and a single flash and bong for the closing operation of the door. If this does not occur then there is an open or short in that circuit or a bad component. This feedback is not provided for the Interior Lights, the Tamper signal or the Remote Keyless Entry (RKE) input. The RKE input is tested when you enter diagnostics. The Body Control Module (BCM) sends a signal to the Remote Control Door Lock Receiver and looks for a return signal. If this does not occur it will set a DTC code 8. To test the Interior Lights and the Tamper signal the BCM goes through the following cycle starting at cycle 1 by throwing the Interior Lights Switch from an inactive to an active state:
1. Deactivate the Battery output to the Courtesy Lights.
2. Activates the Battery output to the Courtesy Lights.
3. If the mileage flag is set the Courtesy output is inactive then activates the Courtesy output for 1 second. The interior lights will change state when this occurs.
4. Activates the exterior lights for 1 second.
5. Activates the Horn for 1/2 a second.
6. Enables Shock Sensor diagnostics and turns the Security Indicator LED "ON."
7. Disables Shock Sensor diagnostics and turns the Security Indicator LED "OFF."
Each time the interior lights go from an inactive to an active state the BCM goes to the next cycle and the chime will bong letting the technician know what cycle the BCM is at. BCM types 1, 2, 2E, 2F, and 3 cycle through the table repeating at cycle 1 after cycle 3. BCM type 4 cycles through the table at cycle 1 after cycle 7.