2001 TOYOTA SEQUOIA wire diagram

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

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

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

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

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

I28563
O2
Oil Pressure SenderCombination Meter
Heat Wire
IG4C5
1L±B1627
L±B DI±1654
± DIAGNOSTICSCOMBINATION METER SYSTEM
1848 Author: Date:
2005 SEQUOIA (RM1146U)
Malfunction in oil pressure receiver gauge
CIRCUIT DESCRIPTION
The oil pressure sender detects the oil pressure generated by engine start.
The combination meter determines that the engine is on when the engine revolution is 400 rpm or more, and
determines that the engine is off when the engine revolution is 200 rpm or less.
The oil pressure receiver gauge detects and indicates the oil pressure applied to the oil pressure sender.
WIRING DIAGRAM
DID95±01

I24351
Body ECU
11 3
21 5
B 5W
1G TAILLIGHT Relay
To Taillight
F10
Fusible Link BlockLG
B7
ALTTRLY 2 1L
81
BatteryInstrument Panel J/B
LG
DDJ/9
J/C DI±1706
± DIAGNOSTICSBODY CONTROL SYSTEM
1900 Author: Date:
2005 SEQUOIA (RM1146U)
Taillight Relay Circuit
CIRCUIT DESCRIPTION
TAILLIGHT relay will be ºONº by operating the light control switch. The transistor which activates the tail light
relay has two sorts: one is activated by the light control switch for fail safe and the other is activated by CPU.
When the theft deterrent system is activated, it causes the transistor in the ECU to switch ON and OFF at
approximately 0.4 sec. intervals. This switches the TAILLIGHT relay ON and OFF, and thus flashing the tail-
lights (See the wiring diagram below).
In this condition, if any of the following operations is done, the transistor in the ECU goes OFF and the TAIL-
LIGHT relay switches OFF, and thus stopping the taillights flashing:
(1) Unlock the front LH or RH door with a key.
(2) Turn the ignition switch to ACC or ON position.
(3) Unlock the doors with the wireless door lock control system.
(4) Wait for approximately 60 seconds.
WIRING DIAGRAM
DI6QY±15

I24144
Body ECU
MAINEngine Room J/B
HEAD Relay
Instrument Panel J/B
Battery
LG±R 2D
B12FL
R±W
12 532F
2G
2C
B7 1G 1JL
R±L
R±L
HRLY 8
6
1
6
1
2
(*1): w/ Daytime Running Light
(*2): w/o Daytime Running LightLG±R69 8 To Headlight RH To Headlight LH To DRL No.4 Relay To DIMMER Relay To DIMMER Relay
B 4
5 F10
FL Block(*2) (*2) (*1)
(*1)
(*1)
H±LP RH (*2)
DRL (*1)
H±LP LH (*2)
(*1) DI±1708
± DIAGNOSTICSBODY CONTROL SYSTEM
1902 Author: Date:
2005 SEQUOIA (RM1146U)
Headlight Relay Circuit
CIRCUIT DESCRIPTION
HEAD relay will be ºONº by operating the light control switch. The transistor which activates the HEAD relay
has two sorts: one is activated by the light control switch for fail safe and the other is activated by CPU. The
one that is activated by CPU prevents the headlight from turning off at the time of trouble with the other sys-
tem in the automatic operation circuit.
When the theft deterrent system is activated, it causes the transistor in the ECU to switch ON and OFF at
approximately 0.25 sec. intervals. This switches the HEAD relay ON and OFF, and thus flashing the head-
lights (See the wiring diagram below).
In this condition, if any of the following operations is done, the transistor in the ECU goes OFF and the HEAD
control relay switches OFF, and thus stopping the headlights flashing:
(1) Unlock the front LH or RH door with a key.
(2) Turn the ignition switch to ACC or ON position.
(3) Unlock the doors with the wireless door lock control system.
(4) Wait for approximately 60 seconds.
WIRING DIAGRAM
DI5VQ±14