2003 LEXUS LS430 Identifying ac

Fig. 130: Identifying Height Control Switch Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
3.CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - HEIGHT
CONTROL SWITCH) (SEE ELECTRONIC CIRCUIT INSPECTION PROCEDURE
)
a. Disconnect the suspension control ECU A20 connector.
b. Measure the resistance according to the value (s) in the table below.
TESTER CONNECTION STANDARD SPECIFIED CONDITION
Tester ConnectionSpecified Condition
A20-15 (HSW) - H21-4 (HSW)Below 1 ohms
A20-15 (HSW) - Body ground10 Kohms or higher

Fig. 131: Identifying Suspension Control ECU Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 132: Identifying Height Control Switch Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK:Go to next step
4.CHECK HARNESS AND CONNECTOR (HEIGHT CONTROL SWITCH - BODY GROUND)
(SEE ELECTRONIC CIRCUIT INSPECTION PROCEDURE
)
a. Measure the resistance according to the value (s) in the table below.
TESTER CONNECTION STANDARD SPECIFIED CONDITION
Tester ConnectionSpecified Condition
H21-2 (IGN) - Body groundBelow 1 ohms

Fig. 133: Identifying Height Control Switch Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE SUSPENSION CONTROL ECU (SEE REPLACEMENT
)
CIRCUIT DESCRIPTION
The absorber control switch is used to select the attenuation modes of the shock absorber. 2 levels of
attenuation, "SPORT" and "NORM", are available.

Fig. 136: Identifying Absorber Control Switch Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPLACE ABSORBER CONTROL SWITCH
OK:Go to next step
2.CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - ABSORBER
CONTROL SWITCH) (SEE ELECTRONIC CIRCUIT INSPECTION PROCEDURE
)
a. Disconnect the suspension control ECU A20 connector.
b. Measure the resistance according to the value (s) in the table below.
TESTER CONNECTION STANDARD SPECIFIED CONDITION
Tester ConnectionSpecified Condition
A20-9 (SW1) - A18-4 (ECU1)Below 1 ohms
A20-9 (SW1) - Body ground10 Kohms or higher

Fig. 137: Identifying Suspension Control ECU Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 138: Identifying Absorber Control Switch Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK:Go to next step
3.CHECK HARNESS AND CONNECTOR (ABSORBER CONTROL SWITCH - BODY GROUND)
(SEE ELECTRONIC CIRCUIT INSPECTION PROCEDURE
)
a. Measure the resistance according to the value (s) in the table below.
TESTER CONNECTION STANDARD SPECIFIED CONDITION
Tester ConnectionSpecified Condition
A18-2 (GND) - Body groundBelow 1 ohms

Fig. 139: Identifying Absorber Control Switch Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE SUSPENSION CONTROL ECU (SEE REPLACEMENT
)
CIRCUIT DESCRIPTION
The vehicle height is controlled by pressing the "HIGH" button of the height control switch, "Height Hi" is
displayed on the multi-information display.