BCM Data Parameters:

BD20 Commanded blower voltage (BLWR VOLTS) READ in volts from 0 to 18.0.
BD21 Coolant temperature (COOLANT TP) 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" value for display.
BD22 Commanded air mix door position (COM MIX DR) displayed in percent. Value close to 0% represents cold air mix and value close to 100% represents warm air mix.
BD23 Actual air mix door position (ACT MIX DR) displayed in percent. This value should follow commanded air mix door position (BD22) except when door is commanded beyond its mechanical limits of travel.
BD24 Air delivery mode (AIR MODE) displayed as number from 0 to 12. Each number is code which represents following air delivery modes:
- 0 - Auto-Recirc Upper outlets
- 1 - Auto-outside Upper outlets
- 2 - Auto-Bi-Level outlets
- 3 - Auto-Heater-Defog outlets
- 4 - Auto-Lower outlets
- 5 - OFF
- 6 - Normal purge
- 7 - Cold (DEF) purge
- 8 - Defog
- 9 - Forced (FAN) Lower outlets
- 10 - Forced (FAN) Upper outlets
- 11 - Forced (FAN) Bi-level outlets
- 12 - Forced (FAN) De-fog outlets
BD25 In-car temperature (IN CAR TP) displayed in degrees Celsius (°C) from -40 to 102.
BD26 Actual outside temperature (OUTSIDE TP) displayed in degrees Celsius (°C) from -40 to 93. This value represents actual sensor temperature and is not buffered by software.
BD27 A/C High side temperature (HI SIDE TP) (condenser output) displayed in degrees Celsius (°C) from -40 to 215.
BD28 A/C Low side temperature (LO SIDE TP) (evaporator input) displayed in degrees Celsius (°C) from -40 to 93.
BD32 Sunload temperature sensor (SUN TP) displayed in degrees Celsius (°C) from -40 to 102.
BD40 Actual fuel level (FUEL LEVEL) read in gallons between 0 to 17.0. Value represents actual sensor position and is not restricted by features used to eliminate fuel slosh affects on IPC display value.
BD41 PRNDD21 (PRND321) displayed as four digit binary number as follows:
- P - 0110
- R - 0011
- N - 1010
- D - 1001
- D - 0000
- 2 - 0101
- 1 - 1100
BD42 Dimming pot (DIM POT) displayed in percent. Value close to 0% represents maximum dimming and value close to 100% represents maximum brightness.
BD43 Twilight delay pot (TWI POT) displayed in percent. Value close to 0% represents minimum delay time and value close to 100% represents maximum delay time.
BD44 Twilight Photocell (TWI PHOTO) displayed in percent. Value close to 0% represents daylight and value close to 100% represents darkness.
BD45 Phone Mode (PHONE MODE) displayed as number from 0 to 7, indicating the state of phone system. (Only used with factory installed phone.)
- 0 - No phone system present
- 1 - Phone power off, ignition on
- 2 - Phone power on
- 3 - Phone power on, no service
- 4 - Roam service
- 5 - Call in progress
- 6 - Call received
- 7 - System problem
BD50 Battery voltage (BATT VOLTS) read in volts between 0 and 25.5.
BD51 Generator field (GEN F TERM) displayed in percent. Value close to 0% represents minimum regulator on time and value close to 100% represents maximum regulator on time.
BD60 Vehicle speed (MPH) displayed in miles per hour from 0 to 159.
BD61 Engine speed (RPM) displayed in RPM from 0 to 6375.
BD70 Cruise servo position (C/C FBK) displayed in percent from 0 to 100%. Value close to 0% represents at rest position and value close to 100% represents wide open throttle.
BD71 Oil pressure sensor (OIL PRESS) displayed in psi from 0 to 80.
BD72 DIS KEY displays unique code (defined below) received at the BCM from switch pod for each switch held. This code is for communication between computers and DOES NOT MATCH printed numbers on keys. This parameter is on NON-CRT vehicles only.
- 2 - Disp ON/OFF
- 3 - System Monitor
- 4 - Econ
- 5 - Fuel
- 6 - Range
- 7 - Speed
- 8 - Eng Data
- 9 - Date
- 10 - Dist
- 11 - ETA
- 12 - Elap Time
- 13 - E/M
- 14 - Reset/Enter
- 15 - Odo/Trip
- 16 - Trip Reset
BD98 Ignition cycle (IGN CYCLES) value is the number of times that the BCM has been turned OFF since BCM trouble code was last detected. After 99 ignition cycles, where each OFF, CRANK, OFF cycle counts as 2, without any malfunction being detected, all BCM codes are cleared.
BD99 BCM PROM I.D. (PROM ID) displayed as number, up to four digits long, which can be used to verify that proper PROM was installed in BCM.