Riviera V6-231 3.8L VIN C SFI (1989)
Body Control Module: Reading and Clearing Diagnostic Trouble Codes
Input
BCM INPUT DISPLAYS:
When troubleshooting 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.
BI18
The brake pressure "BRK PRESS" signal is "LO" when ABS brake pressure is below a set value. This input has no meaning on non-ABS
equipped vehicles.
BI21
The low brake fluid "BRK FLUID" display is "LO" when brake fluid level is low.
BI22
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 "HI" when the cruise switch is "ON" and the SET/COAST switch is depressed.
BI77
The "C/C RES/AC" display is "HI" 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."
BI88
The "LOW OIL" display will be "LO" when the engine oil level is low.