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Home >> Cadillac >> 1990 >> Allante F7/ME9 >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Body Computer Module >> Self-Diagnostic System >> How To Operate Diagnostics >> Override Test Function

Override Test Function

Override displays are operated as defined under Selecting Test  . When troubleshooting a malfunction, the BCM and ECM override features allow 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 ECC panel. The display will alternate between "--" for 1 second followed by the normal program value for 5 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 current override.
  2. Selection of another system will cancel current override.
  3. Overriding value beyond either extreme (0 or 99) will display "--" momentarily, and then jump to opposite extreme. If button is released while "--" is displayed, normal program control will resume.
The override test type is unique in that any other test type (except OUTPUT CYCLING) 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. The BCM overrides displays are:

  1. BS00 - TEST DISPLAY

    This test will display "NONE" as no overrides are active at this point.

  2. BS01 - PROGRAM NUMBER

    Override can be controlled from "0" (Max A/C) to "99" (Max heat). The display will hold the override value upon release of the buttons.

  3. BS02 - LIQUID CRYSTAL DISPLAY (LCD) DIMMING

    Override can be controlled from "0" (MAX dim) to "99" (MAX bright). Display will hold override value upon release of buttons.

  4. BS03 - INCANDESCENT BULB DIMMING

    Override can be controlled from "O" (Max dim) to "99" (Max bright) if the park lamps have been turned on. The display will hold the override value upon release of the buttons.

  5. BS04 - COOLING FANS

    Override will control to "0" (fan off) or "99" (Max fans) as long as the button is held. Normal control will resume upon release of the button.

  6. BS06 - 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.

  7. BS07 - OPTION 1

    Allows the ability to change the vehicle option content information stored in the BCM EEPROM. The BCM uses this option information to determine how to operate the displays and other electronic devices. Incorrect option content information in the EEPROM may cause many different problems. Upon selection of this override the option content information will be displayed as a number. To determine the proper OPTION 1 number, calculate the sum of the applicable numbers from BS07 - OPTION 1  table. If necessary, the "WARMER" and "COOLER" buttons can be used to increase and decrease the OPTION 1 number. When the correct number is reached, simultaneously press and hold the "ELAPSED TIME" and "FUEL USED" buttons for three seconds to permanently store the correct value in the EEPROM. The display will blank momentarily and then display the newly stored number.

  8. BS08 - OPTION 2

    Allows the ability to change the vehicle option content information stored in the BCM EEPROM. The BCM uses this option information to determine how to operate the displays and other electronic devices. Incorrect option content information in the EEPROM may cause many different problems. Upon selection of this override the option content information will be displayed as a number. To determine the proper OPTION 2 number, calculate the sum of the applicable numbers from BS08 - OPTION 2  table. If necessary, the "WARMER" and "COOLER" buttons can be used to increase and decrease the OPTION 2 number. When the correct number is reached, simultaneously press and hold the "ELAPSED TIME" and "FUEL USED" buttons for three seconds to permanently store the correct value in the EEPROM. The display will blank momentarily and then display the newly stored number.

BS07 - OPTION 1

If Vehicle Is Equipped With Add
Non-French Canadian Displays 128
Domestic Displays (U.S. Cars Only) 64
Japanese Displays 1
Oil Level Sensor 32
OSM No. 13 (All Cars) 16
Only Two Filaments In Each Taillamp 2
Canadian Daytime Running Lights 8
Sweden/Norway Daytime Running Lights 4
BS08 - OPTION 2

If Vehicle Is Equipped With Add
Low Coolant Sensor 1
Speed Dependent Damping 2
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