Page 1780 of 4323
DI1AM±35
DI±1578
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
1772 Author: Date:
2005 SEQUOIA (RM1146U)
DIAGNOSTIC TROUBLE CODE CHART
ECM DIAGNOSTIC TROUBLE CODE CHART (MIL)
DTC No.
(See page)Detection ItemTrouble Area
99
(DI±1580)Engine immobiliser system malfunction
Transponder key ECU
ECM
Wire harness
TRANSPONDER KEY ECU DIAGNOSTIC TROUBLE CODE CHART (SECURITY INDICATOR LIGHT)
DTC No.
(See page)Detection ItemTrouble Area
11
(DI±1582)Code 11 is not output
Unlock warning switch
Transponder key ECU
Wire harness
12
(DI±1585)Code 12 is not output
Driver door courtesy lamp switch
Transponder key ECU
Body ECU
Wire harness
13
(DI±1587)Code 13 is not output
Ignition switch
Transponder key ECU
Wire harness
21, 22
(DI±1589)Code 21 or 22 is not output
Key
Transponder key ECU
Transponder key amplifier with key coil
Wire harness
31, 35, 36, 37
(DI±1592)Code 31, 35, 36 or 37 is outputKey
32, 33
(DI±1593)Code 32 or 33 is output
Key
Transponder key ECU
Wire harness
34Code 34 is outputTransponder key ECU has no memory space to register anoth-
er key code
HINT:
DTCs 11, 12, 13, 21 and 22 are normal codes.
As for the normal codes, if the corresponding DTC is not output while operating any of the components
listed under ºTrouble Areaº, perform the inspection described in the reference pages.
DTCs 31, 32, 33, 34, 35, 36, 37 and 99 are abnormal codes.
Page 1781 of 4323
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)
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
DI±1579
1773 Author: Date:
2005 SEQUOIA (RM1146U)
PARTS LOCATION
Page 1782 of 4323
DIABC±03
I24830
ECMT16
Transponder Key ECU
IMI
IMO16
15P ± G
11
10EFIO
EFII L ± Y E5
E5 DI±1580
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
1774 Author: Date:
2005 SEQUOIA (RM1146U)
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 ConditionTrouble 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
Page 1783 of 4323
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
DI±1581
1775 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Has ECU communication ID registration been carried out? (See page BE±137)
NO Carry out ECU communication ID registration
again.
YES
2 Check harness and connector between transponder key ECU and ECM (See
page IN±35)
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 IN±35).
Page 1784 of 4323
I24832
Transponder Key ECU Body ECU
KSW Y±G
T169
KSW2
B515 DI±1582
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
1776 Author: Date:
2005 SEQUOIA (RM1146U)
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 ConditionTrouble Area
11Key unlock warning switch operates normally.
Unlock warning switch
Transponder key ECU
Wire harness
WIRING DIAGRAM
DIABD±03
Page 1785 of 4323
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
DI±1583
1777 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
When using the hand±held tester, start the inspection from step 1 and when not using the hand±held tester,
start from step 2.
1 Check key unlock warning buckle switch using hand±held tester.
PREPARATION:
Connect the hand±held tester to the DLC 3.
CHECK:
Check the key unlock warning switch using the DATA LIST.
OK Go to step 4.
NG
2 Check key unlock warning switch (See page BE±24 ).
NG Replace key unlock warning switch.
OK
3 Check wire harness and connector between key unlock warning switch and
body ECU (See page IN±35).
NG Repair or replace wire harness or connector.
OK
Page 1786 of 4323
DI±1584
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
1778 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check harness and connector between transponder key ECU and body ECU (See
page IN±35).
NG Repair or replace harness or connector.
OK
Replace transponder key ECU
(See page IN±35).
Page 1787 of 4323
I24832
DCY2GR±L8
T16CTY Transponder Key ECU
13
B7 Body ECU
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
DI±1585
1779 Author: Date:
2005 SEQUOIA (RM1146U)
Code 12 is not output
CIRCUIT DESCRIPTION
The transponder key ECU outputs DTC 12 when the front driver's door is open.
HINT:
DTC 12 is a normal code.
DTC NoDTC Detecting ConditionTrouble Area
12Driver door courtesy light switch operates normally.
Driver door courtesy light switch
Transponder key ECU
Body ECU
Wire harness
WIRING DIAGRAM
DIABE±04
