2003 LEXUS LS430 actuator

CIRCUIT DESCRIPTION
Absorber control actuator switches the damping force depending on the suspension control ECU signals.
Fig. 54: DTC C1725 And DTC C1728 Detecting Condition And Trouble Area

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
WIRING DIAGRAM

Fig. 55: Front Absorber Control Actuator Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.INSPECT ABSORBER CONTROL ACTUATOR OPERATION
a. Connect the han
d-held tester to the DLC3.

b. Turn the ignition switch to the ON position and turn the hand-held tester main switch on.
c. Select the item below in the ACTIVE TEST and operate it with the hand-held tester.
NORMAL CONDITION DESCRIPTION
d. Check the hardness of the absorber while operating the absorber control actuator level from 1 to 17
or from 17 to 1 through the ACTIVE TEST.
OK:
Hardness of the absorber becomes harder or softer.
NG: Go to step 2
OK: REPLACE SUSPENSION CONTROL ECU (SEE REPLACEMENT
)
2.INSPECT ABSORBER CONTROL ACTUATOR
a. Disconnect the absorber control actuator connector.
b. Measure the resistance according to the value (s) in the table below.
TESTER CONNECTION STANDARD SPECIFIED CONDITION STANDARD (FRONT RH)
ItemNormal Condition
DAMPER FR1 to 17 step (The absorber becomes softer as the level approaches to 1 and harder
as the level approaches to 17)
DAMPER FL1 to 17 step (The absorber becomes softer as the level approaches to 1 and harder
as the level approaches to 17)
DAMPER RR1 to 17 step (The absorber becomes softer as the level approaches to 1 and harder
as the level approaches to 17)
DAMPER RL1 to 17 step (The absorber becomes softer as the level approaches to 1 and harder
as the level approaches to 17)
Tester ConnectionSpecified Condition
1 (FBR+) - 3 (GND)12.0 to 12.8 ohms
2 (FAR+) - 3 (GND)12.0 to 12.8 ohms
3 (GND) - 4 (FBR-)12.0 to 12.8 ohms
3 (GND) - 5 (FAR-)12.0 to 12.8 ohms

Fig. 56: Identifying Absorber Control Actuator LH Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
TESTER CONNECTION STANDARD SPECIFIED CONDITION STANDARD (FRONT LH)
Tester ConnectionSpecified Condition
1 (FBL+) - 3 (GND)12.0 to 12.8 ohms
2 (FAL+) - 3 (GND)12.0 to 12.8 ohms
3 (GND) - 4 (FBL-)12.0 to 12.8 ohms
3 (GND) - 5 (FAL-)12.0 to 12.8 ohms

Fig. 57: Identifying Absorber Control Actuator RH Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
TESTER CONNECTION STANDARD SPECIFIED CONDITION STANDARD (REAR RH)
Tester ConnectionSpecified Condition
1 (RBR+) - 3 (ERR)12.0 to 12.8 ohms
2 (RAR+) - 3 (ERR)12.0 to 12.8 ohms
3 (ERR) - 4 (RBR-)12.0 to 12.8 ohms
3 (ERR) - 5 (RAR-)12.0 to 12.8 ohms

Fig. 58: Identifying Absorber Control Actuator Rear RH Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
TESTER CONNECTION STANDARD SPECIFIED CONDITION STANDARD (REAR LH)
Tester ConnectionSpecified Condition
1 (RBL+) - 3 (ERL)12.0 to 12.8 ohms
2 (RAL+) - 3 (ERL)12.0 to 12.8 ohms
3 (ERL) - 4 (RBL-)12.0 to 12.8 ohms
3 (ERL) - 5 (RAL-)12.0 to 12.8 ohms

Fig. 59: Identifying Absorber Control Actuator Rear LH Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPLACE ABSORBER CONTROL ACTUATOR
OK:Go to next step
3.CHECK HARNESS AND CONNECTOR (ABSORBER CONTROL ACTUATOR - SUSPENSION
CONTROL ECU) (SEE ELECTRONIC CIRCUIT INSPECTION PROCEDURE
)
a. Disconnect the air suspension ECU A21 or A22 connector.
b. Measure the resistance according to the value (s) in the table below.
TESTER CONNECTION STANDARD SPECIFIED CONDITION STANDARD (FRONT RH)
Tester ConnectionSpecified Condition
A21-1 (FAR+) - S6-2 (FAR+)Below 1 ohms
A21-2 (FAR-) - S6-5 (FAR-)Below 1 ohms
A21-3 (FBR+) - S6-1 (FBR+)Below 1 ohms
A21-4 (FBR-) - S6-4 (FBR-)Below 1 ohms
A21-1 (FAR+) - Body ground10 Kohms or higher

Fig. 61: Identifying Absorber Control Actuator Front Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
TESTER CONNECTION STANDARD SPECIFIED CONDITION STANDARD (FRONT LH)
Tester ConnectionSpecified Condition
A21-5 (FAL+) - S5-2 (FAL+)Below 1 ohms
A21-6 (FBL+) - S5-1 (FBL+)Below 1 ohms
A21-14 (FAL-) - S5-5 (FAL-)Below 1 ohms
A21-16 (FBL-) - S5-4 (FBL-)Below 1 ohms
A21-5 (FAL+) - Body ground10 Kohms or higher
A21-6 (FBL+) - Body ground10 Kohms or higher
A21-14 (FAL-) - Body ground10 Kohms or higher
A21-16 (FBL-) - Body ground10 Kohms or higher
S5-3 (GND) - Body groundBelow 1 ohms