2003 LEXUS LS430 Identifying ac

Fig. 12: Identifying Waveform 1
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Waveform 2 (Reference):
WAVEFORM 2 REFERENCE TABLE
TerminalCODE - GND
Tool Setting10 V/DIV., 20ms/DIV.
ConditionNo key in ignition key cylinder -> Key inserted

Fig. 13: Identifying Waveform 2
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Waveform 3 (Reference):
WAVEFORM 3 REFERENCE TABLE
TerminalTXCT - GND
Tool Setting5 V/DIV., 20ms/DIV.
ConditionNo key in ignition key cylinder -> Key inserted

Fig. 14: Identifying Waveform 3
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2.CHECK STEERING LOCK ECU

Fig. 16: Identifying Waveform 1
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Waveform 2 (Reference):
WAVEFORM 2 REFERENCE TABLE
TerminalRXCK - GND
Tool Setting5 V/DIV., 10 ms/DIV.
ConditionIgnition switch OFF -> ON
TerminalTXCT - GND
Tool Setting5 V/DIV., 20ms/DIV.
ConditionIgnition switch OFF -> ON

Fig. 17: Identifying Waveform 2
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Waveform 3 (Reference):
WAVEFORM 3 REFERENCE TABLE
TerminalCODE - GND
Tool Setting10 V/DIV., 20 ms/DIV.
ConditionIgnition switch OFF -> ON

Fig. 18: Identifying Waveform 3
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Waveform 4 (Reference):
WAVEFORM 4 REFERENCE TABLE
TerminalEFIO - GND
Tool Setting10 V/DIV., 500 ms/DIV.
ConditionIgnition switch OFF -> ON

Fig. 19: Identifying Waveform 4
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Waveform 5 (Reference):
WAVEFORM 5 REFERENCE TABLE
TerminalEFII - GND
Tool Setting10 V/DIV., 500 ms/DIV.
ConditionIgnition switch OFF -> ON

Fig. 20: Identifying Waveform 5
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3.CHECK ECM
Fig. 21: Checking ECM

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a. Disconnect the E2 and E4 ECM connectors.
b. Measure the voltage and resistance of the wire harness side connectors.