Component parts
Component parts location
Component description
System
System diagram
System description
Refer to owner’s manual for navigation and audio system operating instructions.
Audio function and display are built into av control unit.
This navigation has the following functions.
iPodВ® is a trademark of Apple inc., registered in the U.S. and other countries.
Navigation system function
Description
Position detection principle
The navigation system periodically calculates the vehicle's current position according to the following three signals:
The current position of the vehicle is then identified by comparing the calculated vehicle position with map data read from the map sd-card (map-matching), and indicated on the screen as a vehicle mark. More accurate data is judged and used by comparing vehicle position detection results found by the gps with the result by map-matching.
The current vehicle position will be calculated by detecting the distance the vehicle moved from the previous calculation point and its direction.
Travel distance calculations are based on the vehicle speed sensor input signal. Therefore, the calculation may become incorrect as the tires wear down. To prevent this, an automatic distance correction function has been adopted.
Change in the travel direction of the vehicle is calculated by a gyroscope (angular velocity sensor) and a gps antenna (gps information).
They have both advantages and disadvantages.
More accurate traveling direction is detected because priorities are set for the signals from these two devices according to the situation.
Map-matching
Map-matching compares a current location detected by the method in the “location detection principle” with a road map data from map sd-card.
Note:
The road map data is based on data stored in the map sd-card.
The vehicle position may not be corrected under the following circumstances and after driving for a certain time when gps information is difficult to receive. In this case, the vehicle mark on the display must be corrected manually
Alternative routes will be shown in different order of priority, and the incorrect road can be avoided if there is an error in distance and/or direction.
Routes are of the same priority if two roads are running in parallel.
Therefore, the vehicle mark may appear on either of them alternately, depending on maneuvering of the steering wheel and configuration of the road.
The map-matching function may find another road and position the vehicle mark on it when driving on a road not present in the map.
Then, the vehicle mark may change to it when the correct road is detected.
Gps (global positioning system)
Gps (global positioning system) is developed for and is controlled by the us department of defense. The system utilizes gps satellites (navstar), transmitting out radio waves while flying on an orbit around the earth at an altitude of approximately 21,000 km (13,049 mile).
The receiver calculates the travel position in three dimensions (latitude/ longitude/altitude) according to the time lag of the radio waves that four or more gps satellites transmit (three-dimensional positioning).
The gps receiver calculates the travel position in two dimensions (latitude/longitude) with the previous altitude data if the gps receiver receives only three radio waves (two-dimensional positioning).
Gps position correction is not performed while stopping the vehicle.
Accuracy of the gps will deteriorate under the following conditions:
(Inside a tunnel, parking in a building, under an elevated highway etc.) Gps receiver may not receive radio waves from gps satellites if any object is placed on the gps antenna.
Note:
Satellite radio function
Auxiliary input function
Rear view monitor function
Camera image operation principle
Usb connection function
Note:
Use the enclosed usb harness when connecting ipodВ® to usb connector and aux jack.
IpodВ® is a trademark of apple inc., Registered in the u.S. And other countries.
Speed sensitive volume system
Hands-free phone system
When a call is originated
When receiving a call
Diagnosis system (av control unit)
Description
The av control unit on board diagnosis performs the functions listed in the table below:
Perform consult diagnosis if the av control unit on board diagnosis does not start or the screen does not display anything.
On Board Diagnosis Function
Method of starting
CONSULT Function
Consult functions
Consult performs the following functions via communication with the av control unit.
Ecu identification
The part number of av control unit is displayed.
Self diagnostic result
Refer to AV-233, "DTC Index".
DATA MONITOR
CONFIGURATION
Refer to AV-251, "CONFIGURATION (AV CONTROL UNIT) : Description".
CAN DIAG SUPPORT MNTR
Refer to LAN-13, "CAN Diagnostic Support Monitor".
Dtc/circuit diagnosis
Eco mode switch
Component function check
1. Check eco mode switch operation
Turn ignition switch ON.
Check ECO mode indicator lamp turns ON/OFF on combination meter when
turn ECO mode switch ON/
OFF.
Is the inspection result normal?
Yes >> inspection end
No >> go to dm ...
Supplemental air bag warning light
The supplemental air bag warning light,
displaying in the instrument panel,
monitors
the circuits for the air bag systems, pretensioners
and all related wiring.
When the ignition switch is placed in the ON or
START position, the supplemental air bag warning
light illuminates for about ...
P0139 HO2S2
DTC Logic
DTC DETECTION LOGIC
The heated oxygen sensor 2 has a much longer switching time
between rich and lean than the air fuel ratio (A/F) sensor 1. The oxygen
storage capacity of the three way catalyst 1 causes the longer
switching time. To judge the malfunctions of heated oxygen sensor
2, ...