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05-1839
DIAGNOSTICS - ENGINE IMMOBILIZER SYSTEM
05A27-25
TERMINALS OF ECU
1. CHECK TRANSPONDER KEY AMPLIFIER (COIL)
I14
B65593
(a) Disconnect the I14 amplifier connector, and check the resistance between the terminal of the wire har-
ness side connector and body ground.
Standard:
Symbols (Terminal No.) Wiring Color Condition Specified Condition
GND (I14-7) -
BR-R - Body ground Constant Below 1
Body ground
If the result is not as specified, there may be a malfunction on the wire harness side.
(b) Reconnect the I14 amplifier connector, and check the resistance or voltage of each terminal of the con-
nector.
Standard:
Symbols (Terminal No.) Wiring Color Condition Specified Condition
VC5 (I14-1) -
Y-B - BR-R No key in ignition key cylinder With key 0 V 10 to 14 V
GND (I14-7)
CODE(I14-4) -
Y - BR-R No key in ignition key cylinder With key Waveform 1
GND (I14-7)
TXCT (I14-5) -
Y-R - BR-R No key in ignition key cylinder With key Waveform 2
GND (I14-7)
GND (I14-7) -
BR-R - Body ground Constant Below 1
Body ground
If the result is not as specified, the amplifier may have a malfunction.
(c) Inspect using an oscilloscope.
Waveform 1 (Reference):
Terminal CODE - GND
Tool Setting 10 V/DIV., 10 ms/DIV.
GND Condition Ignition switch ON
B55023
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2022
05-1840
DIAGNOSTICS - ENGINE IMMOBILIZER SYSTEM
Waveform 2 (Reference):
Terminal TXCT - GND
Tool Setting 10 V/DIV., 10 ms/DIV.
Condition Ignition switch ON
GND
B55024
2. CHECK TRANSPONDER KEY ECU ASSY
T6
B50659
(a) Disconnect the T6 ECU connector, and check the voltage and resistance between each terminal of
the wire harness side connector.
Standard:
Symbols (Terminal No.) Wiring Color Condition Specified Condition
AGND (T6-13) -
BR-R - Body ground Constant Below 1
Body ground
+B (T6-1) -
W-L - W-B Constant 10 to 14 V
GND (T6-14)
IG (T6-2) -
B-O - BR-R Ignition switch OFF ON 0 V 10 to 14 V
AGND (T6-13)
KSW (T6-10) - 10 k or higher
L-W - BR-R No key in ignition key cylinder With key
AGND (T6-13) Below 1
If the result is not as specified, there may be a malfunction on the wire harness side.
(b) Reconnect the T6 ECU connector, and check the voltage between each terminal of the connector.
Standard:
Symbols (Terminal No.) Wiring Color Condition Specified Condition
KSW (T6-10) -
L-W - BR-R No key in ignition key cylinder With key 10 to 14 V 0 V
AGND (T6-13)
VC5 (T6-8) -
Y-B - BR-R Ignition switch OFF ON 0 V 4.6 to 5.4 V
AGND (T6-13)
TXCT (T6-12) -
Y-R - BR-R Ignition switch OFF ON Waveform 1
AGND (T6-13)
CODE (T6-11) -
Y - BR-R Ignition switch OFF ON Waveform 2
AGND (T6-13)
EFIO (T6-6) -
BR-R - BR-R Ignition switch OFF ON Waveform 3
AGND (T6-13)
EFII (T6-7) -
BR-W - BR-R Ignition switch OFF ON Waveform 4
AGND (T6-13)
If the result is not as specified, the ECU may have a malfunction.
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2023
05-1841
DIAGNOSTICS - ENGINE IMMOBILIZER SYSTEM
(c) Inspect using an oscilloscope.
Waveform 1 (Reference):
Terminal TXCT - GND
Tool Setting 5 V/DIV., 20 ms/DIV.
Condition Ignition switch ON
GND
B69239
Waveform 2 (Reference):
Terminal CODE - GND
Tool Setting 10 V/DIV., 20 ms/DIV.
Condition Ignition switch ON
GND
B69240
Waveform 3 (Reference):
Terminal EFIO - GND
Tool Setting 5 V/DIV., 50 ms/DIV.
Condition Ignition switch ON
GND
B69241
Waveform 4 (Reference):
Terminal EFII - GND
Tool Setting 5 V/DIV., 50 ms/DIV.
Condition Constant
GND
B69242
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2024
05-1842
DIAGNOSTICS - ENGINE IMMOBILIZER SYSTEM
3. CHECK ECM
E8 E7 E6 E5 E4
B50745
(a) Disconnect the E6 and E7 ECM connectors, and check the voltage or resistance between each termi-
nal of the wire harness side connectors.
Standard:
Symbols (Terminal No.) Wiring Color Condition Specified Condition
IMI (E5-27) - E1 (E6-1) BR-R - BR No key in ignition key cylinder With key Waveform 1
IMO (E5-26) -
BR-W - BR No key in ignition key cylinder With key Waveform 2
E1 (E6-1)
E1 (E6-1) -
BR - Body ground Constant Below 1
Body ground
If the result is not as specified, there may be a malfunction on the wire harness side.
(b) Inspect using an oscilloscope.
Waveform 1 (Reference):
Terminal IMI - GND
Tool Setting 5 V/DIV., 50 ms/DIV.
Condition Ignition switch ON
GND
B69241
Waveform 2 (Reference):
Terminal IMO - GND
Tool Setting 5 V/DIV., 50 ms/DIV.
Condition Constant
GND
B69242
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2025
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