Override

When troubleshooting a malfunction, the Body Control Module (BCM) override feature allows testing of certain system functions regardless of normal program instructions.

Upon selecting a test that function's current operation will be represented as a percentage of its full range and this value will be displayed on the Electronic Climate Control (ECC)) panel. The display will alternate between "--" for 1 second followed by the normal program value for 10 seconds. This alternating display is a reminder that the function is not currently being overridden.
Touching the "WARM" or "COOL" buttons on the ECC panel begins the override at which time the display will no longer alternate to "--". Touching the "WARM" button increases the value while the "COOL" button decreases the value. Upon release of the button, the display may either remain at the overridden value or automatically return to normal program control. This depends on which function is being overridden at the time. If the display remains at the override value, normal program control can be resumed in one of three ways:

1. Selection of another override test will cancel the current override.
2. Selection of another system will cancel the current override.
3. Overriding the value beyond either extreme (0 or 99) will display "--" momentarily and then jump to the opposite extreme. If the button is released while "--" is displayed, normal program control will resume and the display will again alternate.

The override test type is unique in that any other test type within the selected system may be active at the same time. After selecting an override test touching the "OFF" button will allow selection of another test type, however, the ECC panel will continue to display the selected override. By selecting another test type and test while at the same time touching the "WARM" or "COOL" button, it is possible to monitor the effect of the override on different vehicle parameters.

BS00 This test will display "NONE" as no overrides are active at this point.
BS01 The program number override can be controlled from "O" (Max A/C) to "98" (Max heat). The display will hold the override value upon release of the buttons.
BS02 The Vacuum Fluorescent (VF) dimming override can be controlled from "O" (Max dim) to "99" (Max bright). The display will hold the override value upon release of the buttons.
BS03 The incandescent bulb-dimming override can be controlled from "O" (Max dim) to "99" (Max bright) if the park lamps have been illuminated. The display will hold the override value upon release of the buttons.
BS04 The cooling fans override will control to "O" (fan off) or "99" (Max fans) as long as the button is held. Normal control will resume upon release of the button.
BS06 The GENERATOR DISABLE override will control to "0" (Gen. on) or "99" (Gen. disabled) as long as the button is held. Normal control will resume upon release of the buttons.