TOYOTA SEQUOIA 2001 Service Repair Manual

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

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

± 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).

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

± 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

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).

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

DI±1586
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
1780 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check operation of door courtesy light.
CHECK:
Check that the door courtesy light comes on when the driver's door is opened, and goes off when it is closed.
OK:
The door courtesy light operates normally.
OK Go to step 4.
NG
2 Check driver courtesy light switch (See page BE±40).
NG Replace driver courtesy light switch.
OK
3 Check harness and connector between body ECU and driver door courtesy light
switch (See page IN±35).
NG Repair or replace harness or connector.
OK
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).

I24834
F10
FL Block1J 1CInstrument Panel J/B
IG2B±R I18
Ignition SW
Battery 56
B B W±R AM22
17
IGN1
1C1E
7
3
4 5Transponder Key ECU
IG 2
2CT16
2DB±O
1B±O
W±R
1 AM2 Engine Room J/BSub J/B No. 4
212
4D 4A
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
DI±1587
1781 Author: Date:
2005 SEQUOIA (RM1146U)
Code 13 is not output
CIRCUIT DESCRIPTION
The transponder key ECU outputs DTC 13 when the ignition switch is ON.
HINT:
DTC 13 is a normal code.
DTC No.DTC Detecting ConditionTrouble Area
13Ignition switch operates normally.

Ignition switch

Transponder key ECU

Wire harness
WIRING DIAGRAM
DIABF±04

DI±1588
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
1782 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check ignition switch (See page BE±24).
NG Replace ignition switch.
OK
2 Check harness and connector between ignition switch and transponder key ECU
(See page IN±35).
NG Repair or replace harness or connector.
OK
Replace transponder key ECU (See page IN±35).