2003 LEXUS LS430 rear seat back

fluctuation in the output voltage becomes greater.
When noise is identified in the waveform on the oscilloscope, error signals are generated due to the
speed sensor rotor's scratches, looseness or foreign matter attached to it.
NG: Go to step 7
OK: REPLACE ABS & TRACTION ACTUATOR ASSY (SEE REPLACEMENT
)
4.INSPECT REAR SPEED SENSOR
Fig. 56: Inspecting Rear Speed Sensor

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Remove the rear seat cushion and seatback.
b. Make sure that the speed sensor connector and the wire harness side connector are securely
connected.
c. Disconnect the speed sensor connector.
d. Measure the resistance accordin
g to the value (s) in the table below.

a. Remove the 2 rear seat back covers.
b. Remove the 2 screws and disconnect the rear seat armrest board.
Fig. 18: Removing RR Seat CTR Armrest Panel

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
c. Remove the 3 screws.
d. Disen
gage the 12 claws and remove the rear seat center armrest panel.

Fig. 33: Removing Rear Speaker Assy Screws
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
REPLACEMENT
HINT:
See COMPONENTS - FIXED , COMPONENTS - POWER ADJUSTER , COMPONENTS -BACK
WINDOW GLASS
See LOCATION
Installation is in the reverse order of removal.
1.REMOVE REAR SEAT CUSHION ASSY RH (See OVERHAUL
- POWER ADJUSTER ,
OVERHAUL
- FIXED )
2.REMOVE REAR SEAT CUSHION ASSY LH (See OVERHAUL
- POWER ADJUSTER ,
OVERHAUL
- FIXED )
3.REMOVE REAR SEAT BACK ASSY RH (See OVERHAUL
- POWER ADJUSTER ,
OVERHAUL
- FIXED )
4.REMOVE REAR SEAT BACK ASSY LH (See OVERHAUL
- POWER ADJUSTER ,

1.REMOVE REAR SEAT CUSHION ASSY RH (See OVERHAUL - FIXED , OVERHAUL -
POWER SEAT ADJUSTER
)
2.REMOVE REAR SEAT CUSHION ASSY LH (See OVERHAUL
- FIXED , OVERHAUL -
POWER SEAT ADJUSTER
)
3.REMOVE REAR SEAT BACK ASSY LH (See OVERHAUL
- FIXED , OVERHAUL - POWER
SEAT ADJUSTER )
4.REMOVE REAR SEAT BACK ASSY RH (See OVERHAUL
- FIXED , OVERHAUL - POWER
SEAT ADJUSTER )
5.REMOVE REAR DOOR SCUFF PLATE RH (See REPLACEMENT
)
6.REMOVE REAR DOOR SCUFF PLATE LH (See REPLACEMENT
)
7.REMOVE REAR DOOR OPENING TRIM WEATHERSTRIP RH (See REPLACEMENT
)
8.REMOVE REAR DOOR OPENING TRIM WEATHERSTRIP LH (See REPLACEMENT
)
9.REMOVE REAR SEAT SIDE COVER RH (See REPLACEMENT
)
10.REMOVE REAR SEAT SIDE COVER LH (See REPLACEMENT
)
11.REMOVE ROOF SIDE GARNISH INNER RH (See REPLACEMENT
)
12.REMOVE ROOF SIDE GARNISH INNER LH (See REPLACEMENT
)
13.REMOVE CENTER STOP LAMP ASSY (See REPLACEMENT
)
14.REMOVE REAR SPEAKER GRILLE SUB-ASSY (See REPLACEMENT
)
15.PACKAGE TRAY TRIM PANEL ASSY (See REPLACEMENT
)
16.REMOVE CLEARANCE WARNING BUZZER NO. 2
a. Disconnect the connector.
b. Disengage the clip and remove the clearance warning buzzer No. 2.

Replace the RH side by using the same procedures as for the LH side.
The procedures listed below are for the LH side.
1.REMOVE REAR SEAT CUSHION ASSY (SEE OVERHAUL
- FIXED TYPE or OVERHAUL -
POWER ADJUSTER TYPE
)
2.REMOVE REAR SEAT HEAD REST ASSY (SEE OVERHAUL
- FIXED TYPE or OVERHAUL -
POWER ADJUSTER TYPE )
3.REMOVE REAR SEATBACK ASSY (SEE OVERHAUL
- FIXED TYPE or OVERHAUL -
POWER ADJUSTER TYPE
)
4.REMOVE REAR WHEEL
5.REMOVE REAR WHEEL HOUSE LH LINER
6.REMOVE SPEED SENSOR REAR LH
a. Disconnect the speed sensor connector, and pull out the speed sensor wire harness with the
grommet.
Fig. 116: Disconnecting Speed Sensor Connector

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
b. Remove the nut and bolt and disconnect the speed sensor rear wire harness.

Fig. 123: Connecting Grommet And Speed Sensor Rear
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
8.INSTALL REAR WHEEL HOUSE LH LINER
9.INSTALL REAR WHEEL
Torque: 103 N.m (1,050 kgf.cm, 76 ft.lbf)
10.INSTALL REAR SEATBACK ASSY (SEE OVERHAUL
- FIXED TYPE or OVERHAUL -
POWER ADJUSTER TYPE
)
11.INSTALL REAR SEAT HEAD REST ASSY (SEE OVERHAUL
- FIXED TYPE or OVERHAUL -
POWER ADJUSTER TYPE )
12.INSTALL REAR SEAT CUSHION ASSY (SEE OVERHAUL
- FIXED TYPE or OVERHAUL -
POWER ADJUSTER TYPE
)
13.CHECK ABS SPEED SENSOR SIGNAL (SEE TEST MODE PROCEDURE
)
COMPONENTS

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.

Dynamic
Radar/Laser
Cruise
(Maintains
vehicle-to-
vehicle
distance)
Tx
RxTx Rx Tx Rx
Vehicl
Vehi
dista
n
control
not op
e
Back
Monitor
(Exterior
view from
rear of
vehicle is
displayed
while
reversing)
Tx Rx Back m
onl
Air
Suspension
Control
(Controls
suspension
properly
based on
vehicle
conditions)
TxTx Rx Control
Meter
Display
(Displays
operation
condition
and DTCs)
TxTx RxTx
Lamp
not co
m
or remai
Pre -
collision
Safety (Skid
control ECU
brings BA in
standby
mode and
seat belt is
fastened by
seat belt
control ECU
when
distance
control ECU
determines
that collision
Rx Tx RxPre-col
l
safety sy
does
oper
a