2003 LEXUS LS430 Identifying ac

Fig. 67: Identifying Absorber Control Actuator Rear LH 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 exhaust solenoid discharges high pressure air from the system by opening the solenoid valve according to
the si
gnal from the suspension control ECU.

Fig. 70: Identifying Exhaust Solenoid Valve Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
3.CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - EXHAUST
SOLENOID VALVE) (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
A20-5 (SLEX) - H12-1 (SLEX)Below 1 ohms
A20-5 (SLEX) - Body ground10 Kohms or higher

Fig. 71: Identifying Suspension Control ECU Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 72: Identifying Exhaust Solenoid Valve 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 (EXHAUST 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
Tester ConnectionSpecified Condition

Fig. 73: Identifying Exhaust Solenoid Valve 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
)
H12-2 (GND) - Body groundBelow 1 ohms

Fig. 76: Identifying Height Control Solenoid Valve Front RH Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
c. RH:
Connect terminal 3 (SLFR) to the battery positive (+) terminal, and terminal 2 (GND) to the battery
negative (-) terminal.
d. LH:
Connect terminal 1 (SLFL) to the battery positive (+) terminal, and terminal 2 (GND) to the battery
negative (-) terminal.
e. Check the operating sound of the height control solenoid valve.
Tester ConnectionSpecified Condition
1 (SLFL) - 2 (GND)10 to 14 ohms

Fig. 77: Identifying Height Control Solenoid Valve Front 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 front solenoid valve, replace the height control valve sub-assy No. 1.
HEIGHT CONTROL SOLENOID VALVE REAR:
a. Disconnect the height control solenoid valve connector.
b. Measure the resistance according to the value (s) in the table below.
TESTER CONNECTION STANDARD SPECIFIED CONDITION STANDARD (RH)
OKA
NGB
Tester ConnectionSpecified Condition

TESTER CONNECTION STANDARD SPECIFIED CONDITION STANDARD (LH)
Fig. 78: Identifying Height Control Solenoid Valve Rear RH Connector Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
c. RH:
Connect terminal 1 (SLRR) to the battery positive (+) terminal, and terminal 2 (GND) to the battery
negative (-) terminal.
d. LH:
Connect terminal 3 (SLRL) to the battery positive (+) terminal, and terminal 2 (GND) to the battery
negative (-) terminal.
e. Check the operatin
g sound of the height control solenoid valve.
1 (SLRR) - 2 (GND)10 to 14 ohms
Tester ConnectionSpecified Condition
2 (GND) - 3 (SLRL)10 to 14 ohms