Allante V8-273 4.5L (1991)
Body Control Module: Reading and Clearing Diagnostic Trouble Codes
Input
When troubleshooting a malfunction, the PCM/ECM, BCM, or Lighting input displays 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 can 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, otherwise a "O"
will remain displayed. 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:
BI03
The driver (front) door ajar switch display is "LO" when the driver's (front) door is ajar.
BI04
The passenger (rear) door ajar switch display is "LO" when the passengers (rear) door is ajar.
BI08
The low refrigerant pressure switch display is "LO" when the system is low on refrigerant.
BI09
The washer fluid level switch display is "LO" when the vehicle is low on washer fluid.
BI10
BI10 displays HI with proper coolant level.
BI21
BI21 will read HI with proper brake fluid level.
BI30
The TEMP/TIME switch display is "LO" when the button is depressed.
BI51
The generator feedback display is LO when there is a generator problem (or engine not running).
BI55
BI55 reads HI until the key is rotated to the unlock position in the trunk lock cylinder.
BI60
BI60 indicates the status of the alarm output of the theft module. LO indicates that the theft deterrent has been set off. HI is a normal reading.
BI61
BI61 reads HI until the key is rotated to the unlock position in either door lock cylinder.
BI62
BI62 will read LO with the soft top up.
BI63
BI63 will read LO with hard top installed and connected.
BI64
BI64 will indicate LO with proper oil level.
BI90
BI90 will indicate LO with right turn selected.
BI91
BI91 will indicate LO with left turn selected.
BI92
BI92 will read LO with the headlamp switch on.
BI93
BI93 will indicate HI unless the headlamp dimmer switch is pulled.
BI94
BI94 reading will alternate between HI and LO during normal operation. A fixed reading of HI or Lo indicates a problem in circuit 825 or an
anti-lock brake system problem.
BI95
BI95 will read HI with the service brake applied.
BI96
BI96 reads LO below 5 M.P.H. and HI above 15 M.P.H..
BI97
BI97 reading will alternate between HI and LO during normal operation. A fixed display of HI indicates a problem in circuit 933. A fixed
display of LO indicates the traction control system is active, a problem in circuit 933, or a TCS problem.
BI98
BI98 will read high when the jumper that threads through the spare tire is disconnected. This input disables the traction control system.