Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 2004-2007 Approved SRM 04 05 206dv cib2784
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05-1847
DIAGNOSTICS - ENGINE IMMOBILIZER SYSTEM 05A2C-02
DTC B2784 ANTENNA COIL OPEN/SHORT
CIRCUIT DESCRIPTION
The transponder key coil is built into the transponder key amplifier and receives a key code signal from the
transponder chip in the key. This signal is amplified by the amplifier, then it is output to the transponder key
ECU.
DTC No. DTC Detection Condition Trouble Area
S Wire harness
B2784 Antenna coil is open/short S Transponder key amplifier
S Transponder key ECU assy
WIRING DIAGRAM
T6
I14
Transponder Key ECU Assy
Transponder Key Amplifier
Amplifier
ANT1 VC5 1 Y-B 8
VC5
CODE 4 Y 11
CODE
Coil
TXCT 5 Y-R 12
TXCT
GND 7 BR-R 13
AGND
ANT2
B62676
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 when using the hand-held tester and start from step 2 when not using the
hand-held tester.
1 READ VALUE OF HAND-HELD TESTER
(IMMOBILISER ECU (TRANSPONDER KEY ECU ASSY) (SWITCH CONDITION))
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch ON with the key that will not start the engine.
(c) Select the item ANTENNA COIL on the hand-held tester.
OK: NORMAL
NG: FAIL
OK REPLACE TRANSPONDER KEY ECU ASSY
NG
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2030
05-1848
DIAGNOSTICS - ENGINE IMMOBILIZER SYSTEM
2 CHECK WIRE HARNESS (TRANSPONDER KEY ECU ASSY - TRANSPONDER KEY
AMPLIFIER) (TRANSPONDER KEY ECU ASSY OR
TRANSPONDER KEY AMPLIFIER - BODY GROUND)
(a) Disconnect the T6 ECU and I14 amplifier connectors.
Wire Harness Side
(b) Check the resistance between the wire harness side con-
nectors.
T6 Standard:
Transponder Key ECU Assy Terminal No. Specified Condition
T6-8 (VC5) - I14-1 (VC5) Below 1
T6-1 1 (CODE) - I14-4 (CODE) Below 1
T6-12 (TXCT) - I14-5 (TXCT) Below 1
T6-13 (AGND) - I14-7 (GND) Below 1
(c) Check the resistance between the T6 ECU or I14 amplifi-
er wire harness side connector and the body ground.
I14 Standard:
Transponder Key Amplifier Terminal No. Specified Condition
T6-8 (VC5) or I14-1 (VC5) -
10 k or higher
Body ground
T6-1 1 (CODE) or I14-4 (CODE) -
10 k or higher
Body ground
T6-12 (TXCT) or I14-5 (TXCT) -
10 k or higher
B63404 Body ground
B55013 B64974
T6-13 (AGND) or I14-7 (GND) -
10 k or higher
Body ground
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
REPLACE TRANSPONDER KEY AMPLIFIER
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2031
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