2003 LEXUS LS430 Combination

Fig. 46: Disengaging Combination Meter ECU (Speed Meter Assy)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
e. Remove the combination meter ECU (speed meter assy).

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4800550003002400560056005c000c[
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
10.REMOVE ECU METER CIRCUIT PLATE
a. Using a screwdriver, disengage the 5 claws and remove the ECU meter circuit plate from the
combination meter case No.1.
HINT:
Tape up the screwdriver tip before use.

Fig. 48: Removing ECU Meter Circuit Plate
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
11.INSTALL COMBINATION METER ECU
a. Install the pins and the combination meter ECU (speed meter assy).

Fig. 49: Installing Pins And Combination Meter ECU (Speed Meter Assy)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
b. Engage the claw and install the combination meter ECU with 4 screws.
c. Connect the connectors.

Fig. 50: Installing Combination Meter ECU
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

to save time. The DATA LIST can be displayed during the ACTIVE TEST.
a. Connect the hand-held tester (with CAN VIM) to the DLC3.
b. Turn the ignition switch ON.
c. Perform the ACTIVE TEST according to the display on the tester.
Meter ECU:
ACTIVE TEST - METER ECU
CIRCUIT DESCRIPTION
This circuit supplies power to operate the driver door ECU.
WIRING DIAGRAM
ItemTest DetailsDiagnostic Note
KEY REMINDER BUZZERCombination meter warning buzzer OFF/ON-

HINT:
The combination of autonomous and GPS navigation makes it possible to display the vehicle
position even when the vehicle is in places where the GPS radio wave cannot receive a signal.
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57004b004800030050004400530053004c0051004a00030044[ccuracy may slightly decline.
Fig. 5: Identifying GPS Satellite

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b. Autonomous navigation
This method determines the relative vehicle position based on the running track determined by the
gyro and vehicle speed sensors located in the navigation ECU.
1. Gyro sensor
Calculates the direction b
y detecting angular velocity. It is located in the radio and navigation
map disc.
Map MatchingThe map data from the map disc is compared to the vehicle position and
running track data. Then, the vehicle position is matched with the
nearest road.
GPS CorrectionThe vehicle position is matched to the position measured by GPS. Then,
the measurement position data from the GPS unit is compared with the
vehicle position and running track data. If the position is widely
different, the GPS measurement position is used.
Distance CorrectionThe running distance signal from the vehicle speed sensor includes the
error caused by tire wear and slippage between the tires and road
surface. Distance correction is performed to account for this. The
navigation ECU automatically offsets the running distance signal to
make up for the difference between it and the distance data of the map.
The offset is automatically updated.