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Home >> Buick >> 1989 >> Reatta V6-231 3.8L VIN C SFI >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Body Control Module >> Testing and Inspection >> Reading and Clearing Diagnostic Trouble Codes >> BCM Data Display >> Data Parameters

Data Parameters

BCM DATA DISPLAYS:

While in this mode, the display will show eighteen data messages and the data value of each. This information will assist in tracking down emission or driveability problems, since the displays can be viewed while the vehicle is being driven.

Data displays are operated as follows:

1. Pressing the "OFF" button will stop the test selection process and return the display to the next available test type for the selected system.

2. Pressing the "LO" fan button will display the next smaller test number for the selected test type. If this button is touched with the lowest test number displayed, the highest test number will then appear.

3. Pressing the "HI" fan button will display the next larger test number for the selected test type. If this pad is touched with the highest test number displayed, the lowest test number will then appear.

BD20 The commanded blower voltage "BLWR VOLTS" is displayed in volts from 0 to system voltage.

BD21 The Engine Coolant Temperature "COOLANT TP" is displayed in degrees (C) from -40° to 151°. This value is sent from the ECM to the BCM. If this circuit malfunctions as determined by the ECM, the ECM will send the BCM a "Failsoft" value for display.

BD22 The commanded air mix valve (door) "COM MIX DR" position is displayed in percent (%). A value close to 0% represents a cold air mix and a value close to 100% represents a warm air mix.

BD23 The actual air mix valve (door) "ACT MIX DR" position is displayed in percent (%). This value should follow the commanded air mix door position (BD22) except when the door is commanded beyond its mechanical limits of travel.

BD24 The "AIR MODE" is displayed as a number from 0 to 11. Each number is a code which represents the following air delivery modes:

0 = Auto - Recirculate Upper
1 = Auto - Outside Upper
2 = Auto - Bi-Level
3 = Auto - Heater-Defog
4 = Auto - Lower
5 = OFF
6 = Normal Purge
7 = Cold (DEF) Purge
8 = Defog
9 = Forced Lower
10 = Forced Upper
11 = Forced Bi-Level

BD25 The in-car temperature "IN CAR TP" is displayed in degrees (°C), from -40° to 102°.

BD26 The actual outside temperature "OUTSIDE TP" is displayed in degrees (°C), from -40° to 93°. This valve represents actual sensor temperature and is not restricted by the features used to minimize engine heat affects on the customer display value.


BD27 The high side temperature "HI SIDE TP" (condenser output) is displayed in degrees (°C) from -40° to 215°.

BD28 The low side temperature "LO SIDE TP" (evaporator input) is displayed in degrees (°C) from -40° to 93°.

BD32 The sunload temperature sensor "SUN TP" is displayed in degrees (°C) from 40 to 102.

BD40 The actual "FUEL LEVEL" is displayed in gallons from 0 to 17.0. This value represents actual sensor position and is not restricted by the features used to eliminate fuel slosh effects on the customer display value. The 0 and 17.0 represent the lower and upper limits of travel of the tank sensor. Some fuel is available above and below the sensor stops but is not measurable and varies.

BD41 The "PRND321" is displayed in a 4 digit binary number.

P 0110
R 0011
N 1010
0D 1001
D 0000
2 0101
1 1100

BD42 The dimming pot "DIM POT" is displayed in percent (%) A value close to 0% represents maximum dimming and a value close to 100% represents maximum brightness.

BD43 The twilight delay pot "TWI POT" is displayed in percent (%). A value close to 0% represents minimum delay time and a value close to 100% represents maximum delay time.

BD44 The twilight photocell "TWI PHOTO" is displayed in percent (%). A value close to 0% represents daylight and value close to 100% represents darkness.

BD50 The battery voltage "BATT VOLTS" is displayed in volts between 0 and 25.5.

BD51 The generator field "GEN F TERM" is displayed in percent (%). A value close to 0% represents minimum regulator oil time and a value close to 100% represents maximum regulator on time.

BD60 The vehicle speed "MPLI" is displayed in miles per hour from 0 to 159.

BD61 The engine speed "RPM" is displayed from 0 to 6,375.

BD70 The cruise servo position "C/C FBK" is displayed in percent (%) from 0 to 100. A value close to 0% represents closed throttle position and a value close to 100% represents W.O.T.

BD71 The oil pressure sensor "OIL PRESS" is displayed in pressure (psi) from 0 to 80.

BD90 "OPTION 1" is displayed as a number from 0 to 255. Each number is a code which represents option content. The following are the only accurate options for the Toronado:

138-Vehicle not equipped with twilight sentinel.
202-Vehicle equipped with twilight sentinel (T82)

BD91 "OPTION 2" is displayed as a number between 0 and 255. Each number is a code which represents option content. The valid contents for the Toronado are:

000 - Standard (vacuum assist) brakes.
16 - Anti-skid brakes (ABS).

BD92 "OPTION 3" is displayed as a number. An "87" in this location indicates the EEPROM was programmed by the assembly plant. This value will show up as some number other than "87" if the odometer is ever reprogrammed.

BD98 The "IGN CYCLES" value is the number of times that the ignition has been cycled to "OFF" since a BCM trouble code was last detected. After 99 ignition cycles, where each "OFF," "CRANK," "OFF" cycle counts as 2.0, without any malfunction being detected, all BCM codes are cleared.

BD99 The "PROM ID" is displayed as a number, up to four digits long, which can be used to verify that the proper PROM was installed in the BCM.
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