2001 TOYOTA SEQUOIA key

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).

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

± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
DI±1591
1785 Author: Date:
2005 SEQUOIA (RM1146U)
4 Does the system operate normally after replacement of transponder key ECU?
YES Replace transponder key ECU.
NO
Replace ECM (See page IN±35).

DI±1592
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
1786 Author: Date:
2005 SEQUOIA (RM1146U)
Code 31, 35, 36 or 37 is output.
CIRCUIT DESCRIPTION
These DTCs are indicated when an unregistered key is inserted. When any of them is indicated, clear the
DTC and insert other registed keys to check for DTCs.
When a key that outputs a DTC (31, 35, 36 or 37) is found, register this key. When a DTC (31, 35, 36 or 37)
is not output, there is a possibility that the unregistered key has been inserted before. (The ECM is normal.)
Ask the customer under what conditions the problem occurred to find the cause.
(Example: Another key has been inserted, etc.)
DTC No.DTC Detecting ConditionTrouble Area
31, 35, 36, 37Unmatched key codeKey
INSPECTION PROCEDURE
1 Delete DTC and insert all the presently available keys to check whether the en-
gine starts or not (See page DI±1576).
HINT:
When inserting a key that does not start the engine, a DTC (31, 35, 36 or 37) is stored in memory.
RESULT:
OKAll keys start the engine.
NGA specific key does not start the engine.
OK No problem.
HINT:
If the result is ºOKº, confirm whether or not the customer ever
inserted an unregistered key or the immobiliser key (with a
transponder chip) of another vehicle into the ignition key cylin-
der, and find out the cause of the detection of the DTC.
NG
Register the key that does not start the en-
gine
(See page BE±137).
DIABH±04

I24830
ECMT16
Transponder Key ECU
IMI
IMO16
15P±G
11
10EFIO
EFII L±Y E5
E5
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
DI±1593
1787 Author: Date:
2005 SEQUOIA (RM1146U)
Code 32 or 33 is output
CIRCUIT DESCRIPTION
The transponder key ECU indicates DTC 32 when a key without a key code is inserted, and indicates DTC
33 when a key code cannot be identified.
HINT:
DTCs 32 and 33 are abnormal codes.
DTC No.DTC Detecting ConditionTrouble Area
32, 33Communication error

Key

Transponder key ECU

Wire harness
WIRING DIAGRAM
DIABI±04