2001 TOYOTA SEQUOIA Page 18

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.

± 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).

± 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).

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).

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).

I03114
T6
Transponder Key
Amplifier
13
T16Transponder Key ECU
CODE RXCKTXCT
6
5
45
T16
4
T16 Y±G
LG
R±Y RXCK
CODE TXCT
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
DI±1589
1783 Author: Date:
2005 SEQUOIA (RM1146U)
Code 21 or 22 is not output
CIRCUIT DESCRIPTION
The transponder key ECU outputs DTC 21 while the immobilizer system is deactivated by use of the master
key, and outputs DTC 22 while it is deactivated by use of the sub key.
HINT:
DTCs 21 and 22 are normal codes.
DTC No.
(See Page)DTC Detecting ConditionTrouble Area
21, 22Communication is normal.

Key

Transponder key ECU

Transponder key amplifier with key coil

Wire harness
WIRING DIAGRAM
DIABG±04

DI±1590
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
1784 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check whether the engine can be started with the master key and sub±key for
another vehicle of the same type.
RESULT:
AAll keys start the engine.
BA specific key does not start the engine. In this case, DTC
21 or 22 is not stored in memory.
CAll keys do not start the engine. In this case, DTC 21 and 22
are not stored in memory.
A No problem at this time.
HINT:
If the result is ºAº, confirm whether or not the customer has ever
inserted the key (without a transponder chip) of another vehicle
into the ignition key cylinder.
B The transponder chip of a specific key is defec-
tive. Replace the key.
C
2 Check transponder key coil (See page BE±143).
NG Replace transponder key coil.
OK
3 Check harness and connector between transponder key ECU and transponder
key amplifier (See page IN±35).
NG Repair or replace harness or connector.
OK