Input
BCM DATA DATA DISPLAYS:
When troubleshooting a malfunction, the BCM display can be used to compare the vehicle with problems to a vehicle which is functioning properly. 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 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" Position Sensor Value si displayed in percent (%). The signal is calculated as a percent of available reference voltage to determine PRNDL position. A value close to 100% represents "Park", and a valueclose 0% represents "1".
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 6375.
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.
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, 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.
BCM INPUT DISPLAYS:
When trouble shooting a malfunction the BCM input display can be used to determine if the switched inputs can be properly interpreted. When one of the various input tests is selected, the state of that device is displayed as "HI" or "LO". In general, the "HI" and "LO" refer to the input terminal voltage for that circuit. The display also indicates if the input changed state so that the technician could activate or deactivate any listed device and return to the display to see if it changed state. If a change of state occurred, an "X" will appear next to the "HI/LO" indicator. The "X" will only appear once per selected input, although the "HI/LO" indication will continue to change as the input changes. Some tests are momentary and the "X" can be used as an indication of a change. The following is a list of BCM inputs:
BI01 The courtesy lamp panel switch "PANEL LAMP" display is "LO" when courtesy lights are "ON" from the switch.
BI02 The "PARK LAMP" switch display is "LO" when the park lamp switch is in the "OFF" position.
BI03 The driver door ajar switch "LF DR AJAR" display is "LO" when the drivers door is ajar.
BI04 The passenger door ajar switch "RT DR AJAR" display is "LO" when the passenger door is ajar.
BI05 The "DOOR JAMB" switch display is "LO" when the driver's or passenger's door is open.
BI06 The "DOOR HNDLE" switch display is momentarily "LO" when either outside door handle is lifted.
BI08 The low refrigerant pressure switch "A/C PRESS" display is "LO" when the system is low on refrigerant.
BI09 The "WASH FLUID" display is "LO" when the vehicle is low on windshield washer fluid.
BI21 The low brake fluid "BRK FLUID" display is "LO" when brake fluid level is low.
B122 The park brake switch "PARK BRAKE" display is "LO" when the parking brake is applied.
BI25 The "SEAT BELT" switch display is "HI" when the drivers seatbelt is fastened.
BI51 The generator feedback "GEN I TERM" display is "LO" when there is a generator problem (or engine not running).
BI71 The cruise control brake switch "C/C BRAKE" display is "HI" when the cruise switch is "ON" and the brake pedal is not depressed (free state).
BI75 The "C/C ON-OFF" switch display is "HI" when the cruise control switch is "ON".
BI76 The "C/C SET/CO" display is "Ill" when the cruise switch is "ON" and the SET/COAST switch is depressed.
BI77 The "C/C RES/AC" display is "Fit" when the cruise control switch is "ON" and the RESUME/ACCEL switch is depressed.
BI78 The "HEADLAMPS" display is "HI" whenever the headlamp switch is "ON".
BI183 The HEADLAMP OUT display is "HI" whenever a headlamp is out.
BI184 The TAILLAMP OUT display is "HI" whenever a taillamp is out.
BI185 The STOPLAMP OUT display is "HI" whenever a stoplamp is out.
BI186 The PARKLAMP OUT display is "HI" whenever a parklamp is out.
BI187 The VOICE ACTIVE display is "LO" whenever the voice module is active.
BCM OUTPUT DISPLAYS:
When troubleshooting a malfunction, the BCM output cycling can be used to determine if the output tests can be actuated regardless of the inputs and normal program instructions. Once a test in outputs has been selected, the test will display "HI" and "LO" for three seconds in each state to indicate the command. Actual circuit operation will depend on circuit integrity. If the test selected is not allowed under the current conditions a " =- =- " display will result. A brief summary of each output is provided below:
BO00 The "CYCLE NONE" display will not display "HI" or "LO" as this is a resting spot where no outputs will be cycled.
BO01 The "C/C VENT" display is "HI" when the vent solenoid is "ON" (energized). The cruise switch must be "ON" for this output to cycle.
BO02 The "C/C VAC" display is "HI" when the cruise control vacuum solenoid is "ON" (energized). The cruise switch must be "ON" for this output to cycle.
BO04 The "COUR LMPS" display is "LO" when the courtesy lamp relay is "ON" (energized).
BO05 The "TWILIGHT" display is "LO" when the twilight relays are on (energized).
BOl0 The "CHIME 1" display is "LO" when the intermediate chime is "ON" (sounding).
BO11 The "CHIME 2" display is "LO" when the slow chime is "ON" (sounding).
BO14 The RADIO MUTE is "LO" when all but the LF radio speaker are to be muted far a voice message.