2003 LEXUS LS430 Identifying ac

Fig. 79: Identifying Height Control Solenoid Valve Rear LH Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OK:
It should make an operating sound (click).
RESULT DESCRIPTION
HINT:
When a malfunction is found in the rear solenoid valve, replace the height control valve sub-assy No. 2.
B: REPLACE HEIGHT CONTROL VALVE SUB-ASSY NO. 1 (SEE REPLACEMENT
)
C: REPLACE HEIGHT CONTROL VALVE SUB-ASSY NO. 2 (SEE REPLACEMENT
)
A:Go to next step
4.CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - HEIGHT
OKA
NGC

CONTROL SOLENOID VALVE) (SEE ELECTRONIC CIRCUIT INSPECTION PROCEDURE)
a. Disconnect the suspension control ECU A20 or A21 connector.
b. Measure the resistance according to the value (s) in the table below.
TESTER CONNECTION STANDARD SPECIFIED CONDITION STANDARD (FRONT
RH)
Fig. 80: Identifying Suspension Control ECU Connector Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
TESTER CONNECTION STANDARD SPECIFIED CONDITION STANDARD (FRONT
LH)
TESTER CONNECTION STANDARD SPECIFIED CONDITION STANDARD (REAR RH)
Tester ConnectionSpecified Condition
A20-16 (SLFR) - F3-3 (RH+)Below 1 ohms
A20-16 (SLFR) - Body ground10 Kohms or higher
Tester ConnectionSpecified Condition
A20-17 (SLFL) - F3-1 (LH+)Below 1 ohms
A20-17 (SLFL) - Body ground10 Kohms or higher

TESTER CONNECTION STANDARD SPECIFIED CONDITION STANDARD (REAR LH)
Fig. 81: Identifying Front Height Control Solenoid Valve Connector Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
Tester ConnectionSpecified Condition
A21-8 (SLRR) - R18-1 (RH+)Below 1 ohms
A21-8 (SLRR) - Body ground10 Kohms or higher
Tester ConnectionSpecified Condition
A21-7 (SLRL) - R18-3 (LH+)Below 1 ohms
A21-7 (SLRL) - Body ground10 Kohms or higher

Fig. 82: Identifying Rear Height Control Solenoid Valve Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OK:Go to next step
5.CHECK HARNESS AND CONNECTOR (HEIGHT CONTROL SOLENOID VALVE - 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 STANDARD (FRONT
RH)
TESTER CONNECTION STANDARD SPECIFIED CONDITION STANDARD (FRONT
LH)
TESTER CONNECTION STANDARD SPECIFIED CONDITION STANDARD (REAR RH)
Tester ConnectionSpecified Condition
F3-3 (RH+) - Body groundBelow 1 ohms
Tester ConnectionSpecified Condition
F3-1 (LH+) - Body groundBelow 1 ohms
Tester ConnectionSpecified Condition

TESTER CONNECTION STANDARD SPECIFIED CONDITION STANDARD (REAR LH)
Fig. 83: Identifying Front Height Control Solenoid Valve Connector Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
R18-1 (RH+) - Body groundBelow 1 ohms
Tester ConnectionSpecified Condition
R18-3 (LH+) - Body groundBelow 1 ohms

Fig. 88: Identifying Suspension Control ECU Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 89: Identifying Fusible Link Block Side Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK:Go to next step
5.CHECK HARNESS AND CONNECTOR (AIR SUS RELAY - 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
4 (for AIR SUS relay) - Body groundBelow 1 ohms

Fig. 90: Identifying Air Sus Relay Location
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 signal from the suspension control ECU turns on the AIR SUS relay. At that time, battery voltage is input
to the height control compressor motor through the AIR SUS relay. The height control compressor motor starts.
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