2003 LEXUS LS430 Identifying condition

Fig. 10: Identifying T8 Amplifier Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Disconnect the T8 amplifier connector.
b. Measure the resistance of the wire harness side connector.
Standard:
TRANSPONDER KEY AMPLIFIER - RESISTANCE TABLE
If the result is not as specified, there may be a malfunction on the wire harness side.
c. Reconnect the T8 amplifier connector.
Symbols (Terminal No.)Wiring ColorTerminal
DescriptionConditionSpecified
Condition
GND (T8-7) - Body
groundV - Body
groundGroundAlwaysBelow 1 ohms

Fig. 11: Identifying Waveform 1 Graph
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Waveform 1 (Reference):
WAVEFORM 1 REFERENCE TABLE
Waveform 2 (Reference):
Fig. 12: Identifying Waveform 2 Graph

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
WAVEFORM 2 REFERENCE TABLE
TerminalCODE - GND
Tool Setting10 V/DIV., 20 ms/DIV.
ConditionNo key in ignition key cylinder --> Key inserted
TerminalTXCT - GND
Tool Setting5 V/DIV., 20 ms/DIV.
ConditionNo key in ignition key cylinder --> Key inserted

2.CHECK TRANSPONDER KEY ECU ASSY
Fig. 13: Identifying T9 ECU Connector Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Disconnect the T9 ECU connector.
b. Measure the voltage and resistance of the wire harness side connector.
Standard:
TRANSPONDER KEY ECU - VOLTAGE TABLE
Symbols
(Terminal No.)Wiring
ColorTerminal
DescriptionConditionSpecified Condition
AGND (T9-13) - V - Body GroundAlwaysBelow 1 ohms

Fig. 14: Identifying Waveform 1 Graph
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WAVEFORM 1 REFERENCE TABLE
Waveform 2 (Reference):
TerminalTXCT - GND
Tool Setting5 V/DIV., 20 ms/DIV.
ConditionIgnition switch OFF --> ON

Fig. 15: Identifying Waveform 2 Graph
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WAVEFORM 2 REFERENCE TABLE
Waveform 3 (Reference):
TerminalCODE - GND
Tool Setting10 V/DIV., 20 ms/DIV.
ConditionIgnition switch OFF --> ON

Fig. 16: Identifying Waveform 3 Graph
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WAVEFORM 3 REFERENCE TABLE
Waveform 4 (Reference):
TerminalEFIO - GND
Tool Setting10 V/DIV., 500 ms/DIV.
ConditionIgnition switch OFF --> ON

Fig. 17: Identifying Waveform 4 Graph
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WAVEFORM 4 REFERENCE TABLE
3.CHECK ECM
TerminalEFII - GND
Tool Setting10 V/DIV., 500 ms/DIV.
ConditionIgnition switch OFF --> ON

Fig. 18: Identifying ECM Connectors
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Disconnect the E2 and E4 ECM connectors.
b. Measure the voltage and resistance of the wire harness side connectors.
Standard:
ECM CONNECTORS - REFERENCE 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 (Reference):
Symbols
(Terminal No.)Wiring
ColorTerminal
DescriptionConditionSpecified
Condition
IMI (E2-6) -
E01 (E4-2)GR-G - W-
BTransponder key
ECU input signalNo key in ignition key
cylinder --> Key insertedPulse generation
(see waveform 1)
IMO (E2-7) -
E01 (E4-2)GR-R - W-
BTransponder key
ECU output signalNo key in ignition key
cylinder --> Key insertedPulse generation
(see waveform 2)
E01 (E4-2) -
Body groundW-B - Body
groundGroundAlwaysBelow 1 ohms