Part 2 of 3
COMPASS/MINI-TRIP COMPUTERThe 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 as described above, and will turn it on again when all sliding doors are closed.NOTE: If the BCM receives an unlock input before a sliding door is closed this action will cancel the memory lock.
Door Lock Inhibit- When the key is in the ignition and in the off position, and any door except the rear liftgate is open, all door lock switches are disabled. The unlock switches are still functional. This protects against locking the vehicle with the keys still in the ignition.
Automatic Door Locks- This feature can be enabled or disabled by using either the DRBIII or customer programming method. When enabled, all the doors will lock when the vehicle reaches a speed of 15 MPH and all doors are closed. If a door is opened and the vehicle slows to below 15 MPH, the door locks will operate again once all doors are closed and the speed is above 15 MPH.
RKE (Remote Keyless Entry) Interface- The body control module interfaces with the RKE receiver via a one-way serial bus interface. The RKE receiver sends a 0-5 volt pulse width signal to the BCM depending on which button on the transmitter was pressed. The BCM controls the door lock/unlock relays and arming/disarming of the Vehicle Theft Security System (if equipped). The RKE receiver is capable of retaining up to 4 individual vehicle access codes (4 transmitters). If the PRNDL is in any position except park, the BCM will ground the interface wire thereby disabling the RKE.
The RKE module can be programmed via the DRBIII or customer programming method. The BCM will only allow programming mode to be entered when the ignition is in the ON position, the PRNDL is in park position, and the VTSS (if equipped) is in the disarmed mode.
Programming an RKE Transmitter
Customer Programming Method
NOTE: A VALID, PREVIOUSLY PROGRAMMED TRANSMITTER MUST BE USED.
1. Ensure batteries are approximately 3.2 volts each.
2. Turn the ignition on, place the transmission in park, and make sure the vehicle theft security system (if equipped) is in disarm mode.
3. Using the previously programmed transmitter, press and hold the unlock button for 4 to 8 seconds. While still holding the unlock button, press the panic button, then release both buttons. The BCM will acknowledge that it has grounded the RKE module program enable wire by sounding a single chime tone.
4. Press any button on the transmitter. A single chime tone will acknowledge the RKE module has accepted the transmission.
5. Repeat step 4 for all transmitters that will be used with this vehicle (up to 4 total).
6. Programming mode will last for 30 seconds. To get out of programming mode sooner, turn the ignition off.
DRB Programming
1. Ensure batteries are approximately 3.2 volts each.
2. Turn the ignition ON, place the transmission in park, and make sure the vehicle theft security system (if equipped) is in disarm mode.
3. Select Program RKE" under "Miscellaneous". If the message "BCM is in Programming Mode" does not appear, exit and select "Program RKE" again.
4. Press any button on the transmitter. A single chime tone will acknowledge the RKE module has accepted the transmission.
5. Repeat step 4 for all transmitters that will be used with this vehicle (up to 4 total).
6. Programming mode will last for 30 seconds. To get out of programming mode sooner, press "Back Page".
RADIO SYSTEM
There are three radio systems available this year that will be on the CCD bus. They are the RBR, RBN and RAZ models. The main reason they are on the bus is because of the radio remote controls in the steering wheel. They can control volume up/ down, seek up, seek down and preset station selections. These systems also communicate with the body control module and will set a specific code if there is a problem with the remote controls.
The RBR will have 4 speakers and the others will have 8 speaker locations (infinity sound). All of the 4 main quarter speakers have a built in amplifier. The I/P and pillar speakers receive their signals from the quarter speakers. Depending on the manufacture some systems will have a Front/Rear channel system and others will have a Left/Right channel system. If one of the main quarter speaker audio circuits experiences a short, the other speakers on that channel will also shut down until the circuit is repaired. The radio will also set a trouble code, which is assessible with the DRB, indicating which channel is effected.