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Home >> Buick >> 1993 >> Riviera >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - Pcm/BCM >> Self-Diagnostic System >> Data Display Codes >> BCM Data Parameters:
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BCM Data Parameters:

  1. BD20

    Commanded blower voltage in volts from 0 to 18.0 volts.

  2. BD21

    Coolant temperature displayed in degrees Celsius (°C) from -40 to 151. This value is sent from ECM to BCM. If circuit malfunctions, ECM will send BCM a failsoft default value for display.

  3. BD22

    Commanded air mix door position displayed in percent. Value close to zero percent represents cold air mix and value close to 100 percent represents warm air mix.

  4. BD23

    Actual air mix door position displayed in percent. This value should follow commanded air mix door position (BD22) except when door is commanded beyond its mechanical limits of travel.

  5. BD24

    Air delivery mode displayed as number from 0 to 11. Each number is code which represents these air delivery modes:
    1. 0 - Auto-Recirc/MAX A/C Outlets
    2. 1 - Auto-A/C Outlets
    3. 2 - Auto-Bi-Level Outlets
    4. 3 - Auto-Heater-Def Outlets
    5. 4 - Auto-Heater Outlets
    6. 5 - Off
    7. 6 - Normal Purge
    8. 7 - Cold (DEF) Purge
    9. 8 - Forced/DEF Outlets
    10. 9 - Forced (Fan) Heater Outlets
    11. 10 - Forced (Fan) Bi-Level Outlets
    12. 11 - A/C Purge

  6. BD25

    In-car temperature displayed in degrees Celsius (°C) from -40 to 102.

  7. BD26

    Actual outside temperature displayed in degrees Celsius (°C) from -40 to 58. This value represents actual sensor temperature and is not buffered by software.

  8. BD27

    A/C high side temperature (condenser output) displayed in degrees Celsius (°C) from -40 to 215.

  9. BD28

    A/C low side temperature (evaporator input) displayed in degrees Celsius (°C) from -40 to 93.

  10. BD32

    Sunload temperature sensor displayed in degrees Celsius (°C) from -23 to 102.

  11. BD40

    Actual fuel level displayed in gallons between 0 to 25.5. Value represents actual sensor position and is not restricted by features used to eliminate fuel slosh affects on IPC display value.

  12. BD42

    Dimming pot displayed in percent. Value close to zero percent represents maximum dimming and value close to 100 percent represents maximum brightness.

  13. BD43

    Twilight delay pot displayed in percent. Value close to zero percent represents minimum delay time and value close to 100 percent represents maximum delay time.

  14. BD44

    Twilight photocell displayed in percent. Value close to zero percent represents daylight and value close to 100 percent represents darkness.

  15. BD50

    Battery voltage displayed in volts between 0 and 25.5.

  16. BD51

    Generator field displayed in percent. Value close to zero Percent represents minimum regulator ON time and value close to 100 percent represents maximum regulator ON time.

  17. BD60

    Vehicle speed displayed in MPH from 0 to 159.

  18. BD61

    Engine speed displayed in RPM from 0 to 6375.

  19. BD71

    Oil pressure sensor displayed in psi from 0 to 255.

  20. BD98

    Ignition cycle value displayed as the number of times that the BCM has been turned OFF since BCM trouble code was last detected. After 50 ignition cycles, without any malfunction being detected, all BCM codes are cleared.

  21. BD99

    BCM PROM ID displayed as number, up to four digits long, which can be used to verify that proper PROM was installed in BCM.
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