2003 LEXUS LS430 Factory Repair Manual

Page 3185 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 15: Checking Steering Lock ECU 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
a. Disconnect the S46 ECU connector.  
b. Measure the voltage and resistance of the wire harness side connector. 
Sta

Page 3186 of 4500

LEXUS LS430 2003  Factory Repair Manual If the result is not as specified, there may be a malfunction on the wire harness side. 
c. Reconnect the S46 ECU connector.  
d. Measure the voltage of the connector. 
Standard:  
STEERING LOCK ECU -

Page 3187 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 16: Identifying Waveform 1 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
Waveform 2 (Reference):  
WAVEFORM 2 REFERENCE TABLE 
TerminalRXCK - GND
Tool Setting5 V/DIV., 10 ms/DIV.
ConditionIgniti

Page 3188 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 17: Identifying Waveform 2 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
Waveform 3 (Reference):  
WAVEFORM 3 REFERENCE TABLE 
TerminalCODE - GND
Tool Setting10 V/DIV., 20 ms/DIV.
ConditionIgnit

Page 3189 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 18: Identifying Waveform 3 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
Waveform 4 (Reference):  
WAVEFORM 4 REFERENCE TABLE 
TerminalEFIO - GND
Tool Setting10 V/DIV., 500 ms/DIV.
ConditionIgni

Page 3190 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 19: Identifying Waveform 4 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
Waveform 5 (Reference):  
WAVEFORM 5 REFERENCE TABLE 
TerminalEFII - GND
Tool Setting10 V/DIV., 500 ms/DIV.
ConditionIgni

Page 3191 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 20: Identifying Waveform 5 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
3.CHECK ECM 
Fig. 21: Checking ECM
 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
a. Disconnect the E2 and E4 ECM connec

Page 3192 of 4500

LEXUS LS430 2003  Factory Repair Manual Standard:  
ECM CONNECTORS - VOLTAGE AND RESISTANCE TABLE 
If the result is not as specified, there may be a malfunction on the wire harness side. 
c. Inspect using an oscilloscope.  
Waveform 1 (Refe