steering LEXUS LS430 2003 Factory Owner's Manual

Fig. 2: Audio System Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Input and output signals of each ECU.
TRANSMITTING ECU (TRANSMITTER) CHART
1.CD (Compact Disc) player outline
a. A compact disc player uses a laser pickup to read digital signals recorded on a compact disc (CD).
Transmitting ECU
(Transmitter)
Receiving ECUSignalsCommunication method
Driver Side J/B ECUSteering Pad SwitchACC SW SignalBEAN (Column Bus)
Driver Side J/B ECUSteering Pad SwitchTaillight ON SignalBEAN (Column Bus)
Steering Pad SwitchRadio Receiver AssyAudio SignalBEAN (Column Bus) AVC-
LAN

Fig. 11: Identifying Rear Audio And Rear A/C Control SW Function Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
STEERING PAD FUNCTION
Fig. 12: Identifying Steering Pad Function Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
1.RADIO RECEIVER ASSY
Fig. 13: Radio Receiver Assy ECU Terminal Connector

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 83: Identifying Steering Pad Switch Item Condition Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE
NG: REPLACE STEERING PAD SWITCH (SEE REPLACEMENT
)
CIRCUIT DESCRIPTION
Each unit of the radio receiver system connected to AVC-LAN (communication bus) communicates by
transferring the signals from each switch.
When +B short and GND short occur in this AVC-LAN, radio receiver system will not function normally as
communication is discontinued.
In AVC-LAN, radio receiver assy becomes the communication master, and the radio receiver assy has enough
resistance necessary for transmitting the communication.
WIRING DIAGRAM

23.INSTALL OUTER MIRROR SWITCH ASSY
24.INSTALL COIN BOX
25.INSTALL INSTRUMENT PANEL UNDER COVER NO.1 (SEE REPLACEMENT
)
26.INSTALL CLUSTER FINISH PANEL CENTER LOWER
27.INSTALL INSTRUMENT CLUSTER FINISH PANEL END
28.INSTALL SEAT ASSY FR LH
29.INSTALL SEAT TRACK BRACKET COVER INNER FRONT
30.INSTALL SEAT TRACK BRACKET COVER OUTER FRONT
31.INSTALL SEAT TRACK OUTER COVER LH
32.INSTALL SEAT TRACK COVER RH
33.INSTALL SEAT BELT ANCHOR COVER CAP LH
OVERHAUL
1.DISCONNECT BATTERY NEGATIVE TERMINAL
2.PLACE FRONT WHEELS FACING STRAIGHT AHEAD
3.REMOVE SWITCH & VOLUME CASE
4.REMOVE STEERING WHEEL COVER LOWER NO.2
5.REMOVE HORN BUTTON ASSY (SEE OVERHAUL
)
6.REMOVE STEERING WHEEL ASSY (SEE OVERHAUL
)
<00360036003700030013001c001c001800130010001800130013001400160003000b0013001c001c00180014001000130018001300140013000f00030013001c001c00180015001000130018001300140013000f00030013001c001c001800160010001300
18001300150013000f00030013001c001c0018001700100013[5021)
7.REMOVE STEERING COLUMN COVER (SEE OVERHAUL
)
8.REMOVE SPIRAL CABLE SUB-ASSY (SEE REPLACEMENT
)
9.REMOVE TURN SIGNAL SWITCH ASSY (SEE REPLACEMENT
)
10.REMOVE INSTRUMENT CLUSTER FINISH PANEL CENTER LOWER
11.REMOVE INSTRUMENT CLUSTER FINISH PANEL END
12.REMOVE INSTRUMENT PANEL UNDER COVER SUB-ASSY NO.1 (SEE REPLACEMENT
)
13.REMOVE COIN BOX ASSY
14.REMOVE OUTER MIRROR SWITCH ASSY
15.REMOVE INSTRUMENT PANEL SAFETY PAD SUB-ASSY NO.1 (SEE REPLACEMENT
)
16.REMOVE INSTRUMENT PANEL AIR BAG ASSY LOWER NO.1 (SEE REPLACEMENT
)
17.REMOVE INSTRUMENT PANEL UNDER COVER SUB-ASSY NO.2 (SEE REPLACEMENT
)
18.REMOVE INSTRUMENT CLUSTER FINISH PANEL (SEE REPLACEMENT
)
19.REMOVE COMBINATION METER ASSY (SEE OVERHAUL
)
20.REMOVE PUSH ROD PIN
a. Disconnect the stop lamp switch connector and brake pedal load sensing switch connector.

34.CHECK AND ADJUST BRAKE PEDAL HEIGHT (SEE ON-VEHICLE INSPECTION )
35.CHECK PEDAL FREE PLAY (SEE ON
-VEHICLE INSPECTION )
36.CHECK PEDAL RESERVE DISTANCE (SEE ON
-VEHICLE INSPECTION )
37.INSTALL COMBINATION METER ASSY (SEE OVERHAUL
)
38.INSTALL INSTRUMENT CLUSTER FINISH PANEL (SEE REPLACEMENT
)
39.INSTALL INSTRUMENT PANEL UNDER COVER SUB-ASSY NO.2 (SEE REPLACEMENT
)
40.INSTALL INSTRUMENT PANEL AIR BAG ASSY LOWER NO.1 (SEE REPLACEMENT
)
41.INSTALL INSTRUMENT PANEL SAFETY PAD SUB-ASSY NO.1 (SEE REPLACEMENT
)
42.INSTALL OUTER MIRROR SWITCH ASSY
43.INSTALL COIN BOX ASSY
44.INSTALL INSTRUMENT PANEL UNDER COVER SUB-ASSY NO.1 (SEE REPLACEMENT
)
45.INSTALL INSTRUMENT CLUSTER FINISH PANEL CENTER LOWER
46.INSTALL INSTRUMENT CLUSTER FINISH PANEL END
47.INSTALL TURN SIGNAL SWITCH ASSY (SEE REPLACEMENT
)
48.INSTALL SPIRAL CABLE SUB-ASSY (SEE REPLACEMENT
)
49.INSTALL STEERING COLUMN COVER (SEE OVERHAUL
)
50.INSTALL STEERING WHEEL ASSY (SEE OVERHAUL
)
<00360036003700030013001c001c001800130010001800130013001400160003000b0013001c001c00180014001000130018001300140013000f00030013001c001c00180015001000130018001300140013000f00030013001c001c001800160010001300
18001300150013000f00030013001c001c0018001700100013[5021)
51.INSTALL HORN BUTTON ASSY (SEE OVERHAUL
)
52.INSTALL STEERING WHEEL COVER LOWER NO.2
53.INSTALL SWITCH & VOLUME CASE
54.CONNECT BATTERY NEGATIVE TERMINAL
55.INSPECT SRS WARNING LIGHT (SEE DIAGNOSIS SYSTEM
)
56.PERFORM INITIALIZATION (SEE PRECAUTION
)
OVERHAUL
1.REMOVE ENGINE ROOM SIDE COVER
2.SEPARATE ENGINE ROOM NO.3 R/B
a. Remove the bolt and separate the engine room No.3 R/B.
3.DRAIN BRAKE FLUID
a. Draw out fluid with syringe.
4.REMOVE BRAKE MASTER CYLINDER SUB-ASSY
a. Remove the clamp from the 2 brake tubes.

Fig. 133: Connecting Yawrate Sensor Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
6.INSTALL REAR CONSOLE ARMREST ASSY (SEE REPLACEMENT
)
7.INSTALL CONSOLE BOX CARPET
8.INSTALL CONSOLE UPPER REAR PANEL SUB-ASSY (SEE REPLACEMENT
)
9.PERFORM YAWRATE SENSOR ZERO POINT CALIBRATION (SEE CALIBRATION
)
REPLACEMENT
1.(SEE PRECAUTION
)
2.SEPARATE BATTERY NEGATIVE TERMINAL (SEE PRECAUTION
)
3.PLACE FRONT WHEELS FACING STRAIGHT AHEAD
4.REMOVE HORN BUTTON ASSY (SEE OVERHAUL
)
5.REMOVE STEERING WHEEL ASSY (SEE OVERHAUL
)
<00360036003700030013001c001c001800130010001800130013001400160003000b0013001c001c00180014001000130018001300140013000f00030013001c001c00180015001000130018001300140013000f00030013001c001c001800160010001300
18001300150013000f00030013001c001c0018001700100013[5021)
6.REMOVE STEERING COLUMN COVER (SEE OVERHAUL
)

7.REMOVE SPIRAL CABLE SUB-ASSY (SEE REPLACEMENT )
8.REMOVE STEERING SENSOR
a. Release 6 claw fittings and remove the steering sensor from the spiral cable.
Fig. 134: Removing Steering Sensor From Spiral Cable

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
9.INSTALL STEERING SENSOR
a. Install the steering sensor to the spiral cable.

Fig. 135: Installing Steering Sensor To Spiral Cable
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
10.ADJUST CENTER FRONT WHEEL
11.INSTALL SPIRAL CABLE SUB-ASSY (SEE REPLACEMENT
)
12.CENTER SPIRAL CABLE (SEE REPLACEMENT
)
13.INSTALL STEERING COLUMN COVER
14.INSTALL STEERING WHEEL ASSY (SEE OVERHAUL
)
15.INSTALL HORN BUTTON ASSY (SEE OVERHAUL
)
16.INSPECT STEERING WHEEL CENTER POINT
17.INSPECT HORN BUTTON ASSY (SEE REPLACEMENT
)
18.INSPECT SRS WARNING LIGHT (SEE DIAGNOSIS SYSTEM
)
19.INSPECT ABS WARNING LIGHT AND VSC WARNING LIGHT (SEE DIAGNOSIS SYSTEM
)
PRECAUTION

REPLACEMENT
1.DISCONNECT BATTERY NEGATIVE TERMINAL (SEE PRECAUTION
)
2.REMOVE SEAT BELT ANCHOR COVER CAP LH
3.REMOVE SEAT TRACK COVER RH
4.REMOVE SEAT TRACK OUTER COVER LH
5.REMOVE SEAT TRACK BRACKET COVER OUTER FRONT
6.REMOVE SEAT TRACK BRACKET COVER INNER FRONT
7.REMOVE FRONT SEAT ASSY LH (SEE OVERHAUL
)
8.REMOVE INSTRUMENT CLUSTER FINISH PANEL END
9.REMOVE INSTRUMENT CLUSTER FINISH PANEL CENTER LOWER (SEE
REPLACEMENT
)
10.REMOVE INSTRUMENT PANEL UNDER COVER SUB-ASSY NO.1 (SEE REPLACEMENT
)
11.REMOVE COIN BOX ASSY
12.REMOVE OUTER MIRROR SWITCH ASSY
13.REMOVE INSTRUMENT PANEL SAFETY PAD SUB-ASSY NO.1 (SEE REPLACEMENT
)
14.REMOVE INSTRUMENT PANEL AIR BAG ASSY LOWER NO.1 (SEE REPLACEMENT
)
15.REMOVE INSTRUMENT PANEL UNDER COVER SUB-ASSY NO.2 (SEE REPLACEMENT
)
16.REMOVE INSTRUMENT PANEL GARNISH SUB-ASSY LH (SEE REPLACEMENT
)
17.REMOVE GLOVE COMPARTMENT PLATE (SEE REPLACEMENT
)
18.REMOVE CHOKE KNOB HOLE COVER (SEE REPLACEMENT
)
19.REMOVE INSTRUMENT PANEL FINISH PANEL (SEE REPLACEMENT
)
20.REMOVE FRONT DOOR SCUFF PLATE LH (LHD STEERING POSITION TYPE) (SEE
REPLACEMENT
)
21.REMOVE INSTRUMENT PANEL FINISH PANEL LOWER CENTER (SEE REPLACEMENT
)
22.REMOVE PANEL INSTRUMENT CLUSTER FINISH LOWER (SEE REPLACEMENT
)
23.REMOVE RADIO RECEIVER ASSY W/BRACKET (SEE REPLACEMENT
)
24.REMOVE SHIFT LEVER KNOB SUB-ASSY (SEE REPLACEMENT
)
25.REMOVE CONSOLE PANEL SUB-ASSY UPPER (SEE REPLACEMENT
)
26.REMOVE INSTRUMENT PANEL CUP HOLDER ASSY
27.REMOVE CONSOLE UPPER REAR PANEL SUB-ASSY (SEE REPLACEMENT
)
28.REMOVE CONSOLE BOX CARPET
29.REMOVE REAR CONSOLE ARMREST ASSY (SEE REPLACEMENT
)
30.REMOVE CONSOLE BOX (SEE REPLACEMENT
)
31.TURN BACK FLOOR CARPET ASSY FRONT
32.REMOVE YAWRATE SENSOR
a. Disconnect the
yawrate sensor connector.

1.STEERING SYSTEM HANDLING PRECAUTIONS
a. Care must be taken when replacing parts. Incorrect replacement could affect the performance of the
steering system and result in hazardous driving.
2.SRS AIRBAG SYSTEM HANDLING PRECAUTIONS
a. The LEXUS LS430 is equipped with an SRS (Supplemental Restraint System) such as the driver's
airbag and front passenger airbag. Failure to carry out service operations in correct sequence could
cause unexpected SRS deployment during servicing and may lead to a serious accident. Before
servicing (including removal or installation of parts, inspection or replacement), be sure to read the
precautionary notice for the supplemental restraint system (see PRECAUTION
).
Fig. 1: [Identifying Bus Line]

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
3.BUS LINE REPAIR
a. After repairing the bus line with solder, wrap the repaired part with vinyl tape (see ELECTRONIC
CIRCUIT INSPECTION PROCEDURE ).