2003 LEXUS LS430 steering

INSPECTION PROCEDURE
1.CHECK CAN BUS LINE FOR DISCONNECTION (STEERING SENSOR SUB BUS LINE)
Fig. 42: Disconnecting Steering Sensor Connector (S16)

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

a. Turn the ignition switch to the LOCK position.
b. Disconnect the steering sensor connector (S16).
c. Measure the resistance according to the value (s) in the table below.
Standard:
STEERING SENSOR CONNECTOR TERMINALS RESISTANCE
NG: REPAIR OR REPLACE STEERING SENSOR SUB BUS LINE OR CONNECTOR (CAN-H,
CAN -L)
OK: GO TO NEXT STEP
2.CHECK WIRE HARNESS (IG1, ESS)
Tester ConnectionConditionSpecified value
S16-10 (CANH) -S16-9 (CANL)Ignition Switch OFF54 to 69 ohms

Fig. 43: Disconnecting Steering Sensor Connector (S16)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Measure the resistance according to the value (s) in the table below.
b. Measure the voltage according to the value (s) in the table below.
Standard:
STEERING SENSOR CONNECTOR TERMINALS RESISTANCE AND VOLTAGE
Tester ConnectionConditionSpecified condition
S16-2 (ESS) - Body groundAlwaysBelow 1 ohms
S16-1 (IG1) - Body groundIgnition Switch ON10 to 14 V

NG: REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR
OK: REPLACE STEERING SENSOR (SEE REPLACEMENT )
MODE DESCRIPTION
Fig. 44: Problem Symptom Diagnostic Chart

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

12.CONNECT CONNECTOR
a. Reconnect the skid control ECU sub bus line connector (J41) to the D-CAN J/C B side (w/o earth
terminal).
13.CHECK CAN BUS LINES FOR SHORT CIRCUIT (STEERING SENSOR SUB BUS LINE)
Fig. 98: Disconnecting Steering Sensor Sub Bus Line Connector (J43) From D
-CAN J/C B Side
(W/O Earth Terminal)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Disconnect the steering sensor sub bus line connector (J43) from the D-CAN J/C B side (w/o earth
terminal).

14.CONNECT CONNECTOR
a. Reconnect the steering sensor sub bus line connector (J43) to the D-CAN J/C B side (w/o earth
terminal).
15.CHECK CAN BUS LINES FOR SHORT CIRCUIT (D-CAN J/C)
Fig. 100: Disconnecting CAN Main Bus Line Connector (J37) From D
-CAN J/C A Side (W/Earth
Terminal)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Disconnect the CAN main bus line connector (J37) from the D-CAN J/C A side (w/earth terminal).

a. Reconnect the steering sensor sub bus line connector (J43) to the D-CAN J/C B side (w/o earth
terminal).
25.CHECK CAN BUS LINES FOR SHORT CIRCUIT (STEERING SENSOR SUB BUS LINE)
Fig. 106: Identifying DLC3 Connector terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Disconnect the steering sensor connector (S16).
b. Measure the resistance according to the value (s) in the table below.
Standard:
DLC3 CONNECTOR TERMINALS RESISTANCE
OK: REPLACE STEERING SENSOR (SEE REPLACEMENT
)
Tester connectionConditionSpecified value
D1-6 (CANH) - D1-14 (CANL)Ignition Switch OFF54 to 69 ohms

NG: REPAIR OR REPLACE STEERING SENSOR SUB BUS LINE OR CONNECTOR (CAN-H,
CAN-L)
26.CONNECT CONNECTOR
a. Reconnect the CAN main bus line connector (J45) to the P-CAN J/C A side (w/earth terminal).
27.CHECK CAN BUS LINES FOR SHORT CIRCUIT (CAN BUSES TO LUG-CAN J/C)
Fig. 107: Disconnecting CAN Main Bus Line Connector (J49) From LUG
-CAN J/C A Side
(W/Earth Terminal)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.