Voyager V6-3.3L VIN R (1999)
Body Control Module: Description and Operation
Part 2 of 3
COMPASS/MINI-TRIP COMPUTER
The compass/mini-trip computer is located in the overhead console. It displays to the driver the direction the vehicle is traveling and the current
outside temperature, as well as the following traveler navigational information: average fuel economy (AVG ECO), distance to empty (DTE),
instantaneous fuel economy (ECO), elapsed time (ET), and trip odometer (ODO). The information needed for the traveler functions is received
over the CCD bus from the body control module.
If the compass/mini-trip computer has been replaced, it may be necessary to reset the calibration.
Setting The Compass
The compass/mini-trip module is self-calibrated and requires no adjustment. The word CAL will be displayed to indicate that the compass is in the
fast calibrating mode. CAL will turn off after the vehicle has gone in three complete circles without stopping, in an area free of magnetic
disturbance.
If the module displays the temperature while the compass is blank or shows a false reading, the vehicle must be demagnetized. See the service
procedure.
If the compass still goes blank after the vehicle is demagnetized, the compass/mini-trip module must be replaced.
Compass Magnetic Variance Zones
Setting The Variance
Variance is the difference between magnetic north and geographic north. To determine the variance for the area you are in, refer to the following
zone map provided. The number shown for your area is the variance number for your area.
1. Set the compass/mini-trip console (CMTC) to compass/temperature mode.
2. Press and hold down the RESET button for 5 seconds. NOTE: If the button is held for 10 seconds instead of 5, the CMTC will set the
variance to 8 and enter the fast calibration mode.
3. The VAR light will come on and the last variance setting will be displayed.
4. Press the STEP button to set the zone number.
5. Press the US/M button and resume normal operation,
NOTE: DO NOT ATTACH ANY MAGNETIC DEVICE SUCH AS A MAGNETIC CB ANTENNA TO THE VEHICLE. THIS CAN
CAUSE THE COMPASS TO GIVE FALSE READINGS.
MECHANICAL INSTRUMENT CLUSTER (MIC)
The body control module sends the angular position of the gauges, the status of all CCD indicator lamps, the status and dimming of the mechanical
instrument cluster (MIC) over the CCD bus when the ignition is in the "off,, (unlock), "run", or "start" positions. The PRNDL (VF, if equipped)
and odometer/trip displays work when the ignition is in the "OFF" (unlock), "run", or "start" positions; all other MIC features work only when
ignition is in the "run position. On transition of the ignition from the "OF"' to the "run" position, a bulb check is performed. This consists of
activating all CCD controlled indicator lamps and all VF display segments for approximately 2-4 seconds. The PRNDL bulb check is aborted if
the gear selector is moved from the PARK position, or if the engine exceeds 450 rpm.
POWER DOOR LOCK SYSTEM
When the BCM receives an input for a lock request (door lock switch, RKE, or door key cylinder switch (only with VTSS)), it will ground the
lock-relay coil for a specified amount of time ranging from 375 msec to 1 second. If the request is there beyond 1 second, the BCM considers the
door lock signal stuck and will turn the relay coil off. Once a door lock signal is stuck, the signal input for that door is ignored until the stuck fault
disappears. The unlock signal operates in the same fashion as the lock signal. The door Lock switches provide a variable amount of resistance
thereby dropping the voltage of the multiplexed (MUX) circuit and the BCM will respond to that command.
Other power Door Lock features:
Sliding Door Memory Lock- When the BCM receives an input for a lock request and a sliding door is open, the BCM will turn on the lock relay
