Page 3185 of 4500
Fig. 15: Checking Steering Lock ECU
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Disconnect the S46 ECU connector.
b. Measure the voltage and resistance of the wire harness side connector.
Standard:
STEERING LOCK ECU - VOLTAGE TABLE
Symbols
(Terminal No.)
Wiring Color
Terminal
Description
Condition
Specified
Condition
AGND (S46-18) -
Body groundV - Body groundGroundAlwaysBelow 1 ohms
CPUB (S46-1) -
GND (S46-9)V-Y - W-BBatteryAlways10 to 14 V
IG2 (S46-2) -
AGND (S46-18)B - VIgnition switchIgnition switch
OFF -> ONOV -> 10 to 14 V
Page 3186 of 4500

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)
Page 3187 of 4500
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
Page 3188 of 4500
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
Page 3189 of 4500
Fig. 18: Identifying Waveform 3
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Waveform 4 (Reference):
WAVEFORM 4 REFERENCE TABLE
TerminalEFIO - GND
Tool Setting10 V/DIV., 500 ms/DIV.
ConditionIgnition switch OFF -> ON
Page 3190 of 4500
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
Page 3191 of 4500
Fig. 20: Identifying Waveform 5
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
3.CHECK ECM
Fig. 21: Checking ECM
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.
Page 3192 of 4500
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