2003 LEXUS LS430 key

d. Measure the voltage and resistance of the connector.
Standard:
TRANSPONDER KEY AMPLIFIER - VOLTAGE TABLE
If the result is not as specified, the amplifier may have a malfunction.
e. Inspect using an oscilloscope.
Symbols
(Terminal No.)Wiring
ColorTerminal
DescriptionConditionSpecified
Condition
+B (T8-1) - GND
(T8-7)O-VPower sourceNo key in ignition key
cylinder --> Key inserted0 V --> 4.6 to 5.4V
CODE (T8-4) -
GND (T8-7)R-W - VDemodulated signal
of key code dataNo key in ignition key
cylinder --> Key insertedPulse generation
(see waveform 1)
TXCT (T8-5) -
GND (T8-7)L-B - VKey code output
signalNo key in ignition key
cylinder --> Key insertedPulse generation
(see waveform 2)
GND (T8-7) -
Body groundV - Body
groundGroundAlwaysBelow 1 ohms

Fig. 11: Identifying Waveform 1 Graph
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Waveform 1 (Reference):
WAVEFORM 1 REFERENCE TABLE
Waveform 2 (Reference):
Fig. 12: Identifying Waveform 2 Graph

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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

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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

If the result is not as specified, there may be a malfunction on the wire harness side.
c. Reconnect the T9 ECU connector.
d. Measure the voltage of the connector.
Standard:
TRANSPONDER KEY ECU - VOLTAGE TABLE
If the result is not as specified, the ECU may have a malfunction.
e. Inspect using an oscilloscope.
Waveform 1 (Reference):
Body groundground
CPUB (T9-1) -
GND (T9-14)V-Y - W-BBatteryAlways10 to 14V
IG2 (T9-2) -
AGND (T9-13)B-VIgnition switchIgnition switch OFF -->
ON0V --> 10 to 14V
KSW (T9-3) -
AGND (T9-13)LG-B - VUnlock warning
switchNo key in ignition key
cylinder --> Key inserted10 kohms or higher --
> Below 1 ohms
Symbols
(Terminal No.)Wiring
ColorTerminal DescriptionConditionSpecified
Condition
KSW (T9-3) -
AGND (T9-13)LG-B - VUnlock warning switch
No key in ignition key
cylinder --> Key
inserted
10 to 14V 0V
VC5 (T9-9) -
AGND (T9-13)O - VPower sourceIgnition switch OFF --
> ON0 V --> 4.6 to
5.4V
TXCT (T9-12) -
AGND (T9-13)L-B - VTransponder key amplifier
communication signalIgnition switch OFF --
> ONPulse generation
(see waveform 1)
CODE (T9-10) -
AGND (T9-13)R-W - VTransponder key amplifier
communication signalIgnition switch OFF --
> ONPulse generation
(see waveform 2)
EFIO (T9-6) -
AGND (T9-13)B-Y - VECM output signalIgnition switch OFF --
> ONPulse generation
(see waveform 3)
EFII (T9-7) -
AGND (T9-13)GR-R - VECM input signalIgnition switch OFF --
> ONPulse generation
(see waveform 4)

Fig. 18: Identifying ECM Connectors
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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

Fig. 19: Identifying Waveform 1 Graph
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WAVEFORM 1 REFERENCE TABLE
Waveform 2 (Reference):
TerminalIMI - GND
Tool Setting10 V/DIV., 500 ms/DIV.
ConditionNo key in ignition key cylinder --> Key inserted

Fig. 20: Identifying Waveform 2 Graph
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WAVEFORM 2 REFERENCE TABLE
1.DESCRIPTION
a. The ECM controls the vehicle's immobilizer system functions. Immobilizer system data and the
Diagnostic Trouble Codes (DTCs) can be read through the vehicle's Data Link Connector 3
(DLC3). In some cases, a malfunction may be occurring in the immobilizer system even though the
security indicator lamp is not illuminated. When the system seems to be malfunctioning, use the
hand-held tester to check for malfunctions and perform repairs.
2.CHECK DLC3
HINT:
TerminalIMO - GND
Tool Setting10 V/DIV., 500 ms/DIV.
ConditionNo key in ignition key cylinder --> Key inserted

1.DATA LIST
HINT:
Using the hand-held tester's DATA LIST allows switch, sensor, actuator and other item values to be read
without removing any parts. Reading the DATA LIST early in troubleshooting is one way to save time.
a. Connect the hand-held tester to the Controller Area Network Vehicle Interface Module (CAN
VIM). Then connect the CAN VIM to the DLC3.
b. Turn the ignition switch ON.
c. Read the DATA LIST.
Transponder key ECU assy:
TRANSPONDER KEY ECU ASSY - DATA LIST
Theft warning ECU assy:
Item
Measurement Item/ Display
(Range)
Normal Condition
KEY SWUnlock warning switch signal/
ON or OFFON: Key is in ignition key
cylinder OFF: No key is in
ignition key cylinder
IMMOBILIZERImmobilizer system status/ SET or
UNSETUNSET: Ignition switch ON
SET: Without key
RESPONSETransponder chip data/ NG or OKNG: Data error OK: Data OK
FRAMETransponder chip data/ NG or OKNG: Data error OK: Data OK
SERIAL NUMBERTransponder chip data/ NG or OKNG: Data error OK: Data OK
ENCRYPT CODETransponder chip data/ NG or OKNG: Data error OK: Data OK
STATUSTransponder chip data/ NG or OKNG: Data error OK: Data OK
BCCTransponder chip signal/ NG or
OKNG: Incorrect data sending OK:
Correct data sending
SUB KEYSub-key code signal/ NOMATCH
or MATCHNOMATCH: Unmatched sub-key
code is sent MATCH: Sub-key
code is sent
MASTER KEYMaster key code signal/
NOMATCH or MATCHNOMATCH: Unmatched Master
key code is sent MATCH: Master
key code is sent
REGIST SUB CODENumber of registered sub-
key/min. 0, max. 15Number of registered sub-key
REGIST MAS CODENumber of registered master
key/min. 0, max. 15Number of registered master key
REG CODE SPACEMemory space for key codes
registration/ NOT FULL or FULLNOT FULL: Possible to register
more key codes FULL: Cannot
register any more key codes