2003 LEXUS LS430 key

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

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 - VOLTAGE TABLE
If the result is not as specified, the ECU may have a malfunction.
e. Inspect using an oscilloscope.
Waveform 1 (Reference):
WAVEFORM 1 REFERENCE TABLE
KSW (S46-12) -
AGND (S46-18)LG-B - VUnlock warning
switchNo key in ignition
key cylinder ->
Key inserted10 kohms or
higher -> Below 1
ohms
PUSH (S46-11) -
AGND (S46-18)P-B - VIgnition switch
push signalIgnition switch not
pushed -> pushed10 kohms or
higher -> Below 1
ohms
Symbols
(Terminal No.)
Wiring Color
Terminal
Description
Condition
Specified
Condition
KSW (S46-12) -
AGND (S46-18)LG-B - VUnlock warning
switchNo key in ignition
key cylinder ->
Key inserted10 to 14 V -> 0 V
VC5 (S46-7) -
AGND (S46-18)R - VPower sourceIgnition switch
OFF -> ON0 V -> 4.6 to 5.4 V
RXCK (S46-8) -
AGND (S46-18)L - VTransponder key
amplifier
communication
signalIgnition switch
OFF -> ONPulse generation
(see waveform 1)
TXCT (S46-16) -
AGND (S46-18)Y-B - VTransponder key
amplifier
communication
signalIgnition switch
OFF -> ONPulse generation
(see waveform 2)
CODE (S46-17) -
AGND (S46-18)O - VTransponder key
amplifier
communication
signalIgnition switch
OFF -> ONPulse generation
(see waveform 3)
EFIO (S46-13) -
AGND (S46-18)B-Y - VECM output signalIgnition switch
OFF -> ONPulse generation
(see waveform 4)
EFII (S46-4) -
AGND (S46-18)GR-R - VECM input signalIgnition switch
OFF -> ONPulse generation
(see waveform 5)

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 (Reference):
WAVEFORM 1 REFERENCE TABLE
Symbols
(Terminal No.)
Wiring Color
Terminal
Description
Condition
Specified
Condition
IMI (E2-6) - E01
(E4-2)GR-G - W-BSteering lock ECU
input signalNo key in ignition
key cylinder ->
Key insertedPulse generation
(see waveform 1)
IMO (E2-7) - E01
(E4-2)GR-R - W-BSteering lock ECU
output signalNo key in ignition
key cylinder ->
Key insertedPulse generation
(see waveform 2)
E01 (E4-2) - Body
groundW-B - Body
groundGroundAlwaysBelow 1 ohms
TerminalIMI - GND
Tool Setting10 V/DIV., 500 ms/DIV.
ConditionNo key in ignition key cylinder -> Key inserted

Fig. 22: Identifying Waveform 1
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Waveform 2 (Reference):
WAVEFORM 2 REFERENCE TABLE
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.
Steering lock ECU:
DATA LIST - STEERING LOCK ECU
Item
Measurement Item/
Display (Range)
Normal ConditionDiagnostic Note
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 Number of registered -

Theft warning ECU assy:
DATA LIST - THEFT WARNING ECU ASSY
2.ACTIVE TEST
HINT:
Performing the hand-held tester's ACTIVE TEST allows relay, VSV, actuator and other items to be
operated without removing any parts. Performing the ACTIVE TEST early in troubleshooting is one way
to save time. The DATA LIST can be displayed during the ACTIVE TEST.
a. Connect the hand-held tester (with CAN VIM) to the DLC3.
b. Turn the ignition switch ON.
c. Perform the ACTIVE TEST by following the directions on the tester screen.
Steering lock ECU:
ACTIVE TEST - STEERING LOCK ECU
DIAGNOSTIC TROUBLE CODE CHART
sub-key/min. 0, max. 15sub-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 FUL: Possible to
register more key codes
FULL: Cannot register
any more key codes-
Item
Measurement Item/
Display (Range)
Normal ConditionDiagnostic Note
ACC SWIgnition switch signal/ON
or OFFOFF: Ignition switch is
OFF ON: Ignition switch
is ACC-
IG SWIgnition switch signal/ON
or OFFOFF: Ignition switch is
OFF or ACC ON:
Ignition switch is ON-
ItemTester DetailsDiagnostic Note
SECURITY INDICTurn security indicator ON/OFF-
DTCDescription
DTC B2780PUSH SWITCH/KEY UNLOCK WARNING
SWITCH MALFUNCTION

1.STEERING LOCK ECU DTC CHART
Fig. 27: Steering Lock ECU DTC Chart

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2.ECM DTC CHART
Fig. 28: ECM DTC Chart

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DTC B2793TRANSPONDER CHIP MALFUNCTION
DTC B2794UNMATCHED ENCRYPTION CODE
DTC B2795UNMATCHED KEY CODE
DTC B2797COMMUNICATION MALFUNCTION NO.1
DTC B2799ENGINE IMMOBILIZER SYSTEM
MALFUNCTION

CIRCUIT DESCRIPTION
This DTC will be output if the steering lock ECU does not detect that the unlock warning switch is ON even
when the ignition switch is ON. Under the normal conditions, the unlock warning switch is ON when the
ignition switch is ON.
Fig. 29: Push Switch/Key Unlock Warning Switch Malfunction Circuit Description

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WIRING DIAGRAM
Fig. 30: Push Switch/Key Unlock Warning Switch Malfunction
- Wiring Diagram
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INSPECTION PROCEDURE
1.READ DATA LIST USING HAND-HELD TESTER
a. Connect the hand-held tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
b. Turn the ignition switch ON with the key that cannot start the engine.
c. Read the DATA LIST.
Steering lock ECU:
DATA LIST - STEERING LOCK ECU
Measurement Item/