2003 LEXUS LS430 ignition

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

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

Fig. 24: Checking DLC3
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DLC3
If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and
connector.
HINT:
Connect the cable of the hand-held tester (with CAN VIM) to the DLC3, turn the ignition switch ON and
attempt to use the hand-held tester. If the screen displays the message UNABLE TO CONNECT TO
VEHICLE, there is a problem either with the vehicle or with the tester.
Symbols (Terminals
No.)
Terminal DescriptionConditionSpecified Condition
SIL (7) - SG (5)Bus "+" lineDuring transmissionPulse generation
CG (4) - Body groundChassis groundAlwaysBelow 1 ohms
SG (5) - Body groundSignal groundAlwaysBelow 1 ohms
BAT (16) - Body groundBattery positiveAlways11 to 14 V

If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of
the original vehicle.
If communication is still impossible when the tester is connected to another vehicle, the problem is
probably in the tester itself. Consult the Service Department listed in the tester's instruction manual.
Fig. 25: Connecting Hand
-Held Tester To DLC3
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3.INSPECT BATTERY VOLTAGE
Standard: 11 to 14 V
If the voltage is below 11 V, replace the battery before proceeding.
1.CHECK DTC
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 DTCs by following the directions on the tester screen.
HINT:
Refer to the hand-held tester operator's manual for further details.
Fig. 26: Connecting Hand
-Held Tester To DLC3
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2.CLEAR DTC
a. Connect the hand-held tester (with CAN VIM) to the DLC3.
b. Turn the ignition switch ON.
c. Erase the DTCs by following the directions on the tester screen.
HINT:
Refer to the hand-held tester operator's manual for further details.