Description of On-Board Diagnostics

DIAGNOSIS SYSTEM DESCRIPTION

HINT: There are several diagnosis function in the LEXUS Navigation System.

Though each operation procedure is explained on the following, the outline is as follows.

As the Navigation ECU has its own internal battery, if separating the battery from ECU, each data can be stored.

a. SYSTEM CHECK
Is this mode, communication circuit is inspected and self diagnosis is conduced in each system (Navigation ECU, display ECU, radio receiver, power amplifier and CD auto changer). The result is displayed on the display. At the bottom of the screen the map area is displayed.

c. VEHICLE SIGNAL DISPLAY CHECK
In this mode, 2 items of vehicle signal conditions input in the navigation ECU are displayed at the real time (renewed every approx. 1 sec.).

d. INTERNAL COEFFICIENT SET
This sets time and data of calender and compensation coefficient to improve the accuracy of [1][2]navigation system. It is not always necessary to adjust the compensation coefficient, however when the error is too excessive due to replacement of tires etc., re-set the coefficient again.

e. DIAGNOSIS MEMORY
Information is stored in the diagnosis memory when an error occurs in the communication of the system and the system.

f. GPS INFORMATION
GPS information receiving condition is displayed.

g. NOISE QUALITY CHECK
Chime or navigation voice recorded in HARD DISK can be tried to hear when necessary.

h. DISK INFORMATION
The area of a map in map hard disk, versions of the map data base and the navigation list are displayed.