Toyota Sequoia (2005). Manual — part 446
![](/vehicles/linovind/vere/fry/snomeab.png)
DI3DP–10
I28395
ECM
Transponder Key Coil
Transponder Key Amplifier
Instrument
Panel J/B
IGN Fuse
Engine Room J/B
ECU–B Fuse
EFI No. 1 Fuse
Transponder Key ECU
Combination Meter
Security Indicator Light
MIL
DLC3
(Located behind the combination meter)
–
DIAGNOSTICS
ENGINE IMMOBILISER SYSTEM
DI–1579
1773
PARTS LOCATION
![](/vehicles/linovind/vere/fry/myfrare.png)
DIABC–03
I24830
ECM
T16
Transponder Key ECU
IMI
IMO
16
15
P – G
11
10
EFIO
EFII
L – Y
E5
E5
DI–1580
–
DIAGNOSTICS
ENGINE IMMOBILISER SYSTEM
1774
CIRCUIT INSPECTION
DTC
99
Engine Immobiliser System Malfunction
CIRCUIT DESCRIPTION
This DTC is indicated when a DTC is output from the transponder key ECU, or when there is an open or short
circuit in the wire harness between the transponder key ECU and the ECM.
If the DTC is output after replacing the transponder key ECU or ECM, carry out the ECU communication ID
registration.
DTC No.
DTC Detecting Condition
Trouble Area
99
Error in communication between ECM and transponder key
ECU, or in communication line.
Communication ID is different in communication with trans-
ponder key ECU.
ECU communication ID has not been registered
Transponder key ECU
ECM
Wire harness
WIRING DIAGRAM
![](/vehicles/linovind/vere/fry/thokalyos.png)
–
DIAGNOSTICS
ENGINE IMMOBILISER SYSTEM
DI–1581
1775
INSPECTION PROCEDURE
1
Has ECU communication ID registration been carried out?
(See page
NO
Carry out ECU communication ID registration
again.
YES
2
Check harness and connector between transponder key ECU and ECM (See
page
NG
Repair or replace harness or connector.
OK
3
Does the system operate normally after replacement of transponder key ECU?
YES
Replace transponder key ECU.
NO
Replace ECM
(See page
![](/vehicles/linovind/vere/fry/oroundethe.png)
I24832
Transponder Key ECU
Body ECU
KSW
Y–G
T16
9
KSW2 B5
15
DI–1582
–
DIAGNOSTICS
ENGINE IMMOBILISER SYSTEM
1776
Code 11 is not output
CIRCUIT DESCRIPTION
The transponder key ECU outputs DTC 11 when the key unlock warning switch is ON (key is inserted).
HINT:
DTC 11 is a normal code.
DTC No.
DTC Detecting Condition
Trouble Area
11
Key unlock warning switch operates normally.
Unlock warning switch
Transponder key ECU
Wire harness
WIRING DIAGRAM
DIABD–03
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