2003 LEXUS LS430 Diagram AC

Fig. 44: Identifying T9 ECU And E2 ECM Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Standard:
TRANSPONDER KEY ECU ASSY - ECM - RESISTANCE TABLE
NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
OK: REPLACE ECM
CIRCUIT DESCRIPTION
This circuit provides power to operate the transponder key ECU.
WIRING DIAGRAM
Tester connectionSpecified condition
T9-6 (EFIO) - E2-6 (IMI)Below 1 ohms
T9-7 (EFII) - E2-7 (IMO)Below 1 ohms
T9-6 (EFIO) or E2-6 (IMI) -Body ground10 kohms or higher
T9-7 (EFII) or E2-7 (IMO) -Body ground10 kohms or higher

Fig. 45: ECU Power Source Circuit - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.INSPECT FUSE (MPX-B1, AM2, D/C CUT)
a. Remove the MPX-B1 and AM2 fuses from the passenger side J/B.
b. Remove the D/C CUT fuse from the FL block.
c. Measure the resistance of the fuse.
Standard: Below 1ohms
NG: REPLACE FUSE
OK: Go to next step

Fig. 91: Locating Rear Sunshade System
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
SYSTEM DIAGRAM

Fig. 92: Identifying Rear Sunshade System Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
ON-VEHICLE INSPECTION
1.BASIC INSPECTION
a. With the ignition switch ON, the shift lever in the P position and the rear sunshade fully open, press
the rear sunshade switch built into the front or rear control switch. Check that the rear sunshade
closes fully.
b. After step (a), press the same switch again and check that the rear sunshade opens fully.
c. With the ignition switch ON, the shift lever in the P position and the rear sunshade fully closed,
move the shift lever into the R (reverse) position. Check that the rear sunshade opens fully.
d. Turn the ignition switch OFF while the rear sunshade is moving up/down. Check that the rear
sunshade stops moving.
e. After step (d), turn the ignition switch ON and press the rear sunshade switch built into the front or
rear control switch. Check that the rear sunshade opens full
y.

Fig. 3: Locating Front Power Seat Control System Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Communication Table

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 by following the directions on the tester screen.
Driver seat ECU:
DRIVER SEAT ECU - ACTIVE TEST
CIRCUIT DESCRIPTION
This circuit provides power to operate the driver seat ECU.
This driver seat ECU is built into this power seat switch. The lumbar support switch and the seat cushion switch
are separate from the power seat switch.
WIRING DIAGRAM
ItemTest DetailsDiagnostic Note
RECLININGTest detail: reclining operation FRONT/REAR Vehicle
condition: stopped-
F VERTICALTest detail: front vertical operation UP/DOWN Vehicle
condition: stopped-
LIFTERTest detail: lifter operation UP/DOWN Vehicle condition:
stopped-
SLIDETest detail: sliding operation UP/DOWN Vehicle condition:
stopped-
HEADRESTTest detail: headrest operation UP/DOWN Vehicle condition:
stopped-
CUSHIONTest detail: cushion length operation FRONT/REAR Vehicle
condition: stopped-

Fig. 15: ECU Power Source Circuit (Driver Seat ECU) - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS
TABLE
CIRCUIT DESCRIPTION
This circuit supplies power to operate the driver side J/B ECU.
WIRING DIAGRAM
Tester ConnectionSwitch ConditionSpecified Condition
D27-14 (+B) - Body groundAlways10 to 14 V
D28-9 (SYSB) - Body groundAlways10 to 14 V
D28-10 (IG) - Body groundIgnition switch OFF --> ON0 V --> 10 to 14 V
D27-6 (GND) - Body groundAlwaysBelow 1 ohms
D28-1 (SGND) - Body groundAlwaysBelow 1 ohms