2003 LEXUS LS430 Identifying condition

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. 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. 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. 142: Identifying Combination Meter Assy Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK:Go to next step
2.CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSY - 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
C12-11 - Body groundBelow 1 ohms

Fig. 146: Identifying Combination Meter Assy Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK:Go to next step
2.CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - 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
C12-11 - Body groundBelow 1 ohms

Fig. 149: Identifying DLC3 Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OK:Go to next step
2.CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - DLC3) (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
A20-14 (TD) - D1-11 (OPB)Below 1 ohms
A20-14 (TD) - Body ground10 Kohms or higher

Fig. 9: Identifying Fade Out Area
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
3. Noise problem
It is very important for a technician to understand the specifics of the noise problem. To diagnose the
symptom, use the table below.
RADIO FREQUENCY CHART
Radio FrequencyNoise occurrence conditionPresumable cause
AMNoise occurs in a specified areaForeign noise
AMNoise occurs when listening to an
intermittent broadcastAn identical program transmitted from
multiple towers can cause noise where
the signals overlap
FMNoise occurs only at nightMusic beat from a far-off broadcast
FMNoise occurs while driving in a specified
areaMulti-path or phasing noise resulting
from a change in FM frequency

Fig. 45: Identifying Power Source Circuit (Stereo Component Tuner) Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.INSPECT STEREO COMPONENT TUNER (B, ACC, GND)
a. Disconnect the stereo component tuner connector S31.
b. Measure the resistance according to the value (s) in the table below.
Standard:
TESTER CONNECTION CONDITION CHART
Tester connectionConditionSpecified condition
GND - Body groundAlwaysBelow 1 ohms