Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 2004-2007 Approved SRM 04 05 206dv cib2780
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05-1844
DIAGNOSTICS - ENGINE IMMOBILIZER SYSTEM 05A2A-10
DTC B2780 PUSH SWITCH/KEY UNLOCK WARNING
SWITCH MALFUNCTION
CIRCUIT DESCRIPTION
This DTC will be output if the transponder key ECU does not detect that the un-lock warning switch is ON
even when the ignition switch is ON (Under the normal condition, the un-lock warning switch is ON when
the ignition switch is ON).
DTC No. DTC Detection Condition Trouble Area
S Un-lock warning switch assy
Un-lock warning switch ON is not detected when ignition
B2780 S Wire harness
switch is ON
S Transponder key ECU assy
WIRING DIAGRAM
T6
Transponder Key
ECU Assy
K4
Un-lock Warning J18
Switch Assy J/C
W-B L-B 80 40 L-W 10
KSW
1 2
21
J18
J/C
1
W-B
IE
B64144
B69243
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2027
05-1845
DIAGNOSTICS - ENGINE IMMOBILIZER SYSTEM
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
(TRANSPONDER KEY ECU (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 KEY SW on the hand-held tester.
OK:
ON Key is in IG key cylinder
OFF No key is in IG key cylinder
OK REPLACE TRANSPONDER KEY ECU ASSY
NG
2 INSPECT UN-LOCK WARNING SWITCH ASSY
Free
(a) Remove the un-lock warning switch.
(b) Inspect the un-lock warning switch resistance.
Standard:
Terminal No. Condition Specified Condition
Pushed
Switch pushed
Below 1
(Key set)
1-2
Switch free
10 k or higher
(Key removed)
B52271 NG REPLACE UN-LOCK WARNING SWITCH ASSY
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2028
05-1846
DIAGNOSTICS - ENGINE IMMOBILIZER SYSTEM
3 CHECK WIRE HARNESS
(TRANSPONDER KEY ECU ASSY - UN-LOCK WARNING SWITCH ASSY)
Wire Harness Side (a) Disconnect the T6 ECU and K4 switch connectors.
(b) Check the resistance between the wire harness side con-
nectors.
T6 Standard:
Transponder Key ECU Assy
Terminal No. Specified Condition
T6-10 (KSW) - K4-2 Below 1
K4
Un-lock Warning Switch Assy
B63404 NG REPAIR OR REPLACE HARNESS AND
B69245 B64973 CONNECTOR
OK
REPLACE TRANSPONDER KEY ECU ASSY
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2029
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