2001 TOYOTA SEQUOIA ECU

BE±8
± BODY ELECTRICALTROUBLESHOOTING
3412 Author: Date:
2005 SEQUOIA (RM1146U)
DEFOGGER SYSTEM
SymptomSuspect AreaSee page
Rear window defogger does not operate.
1. HTR Fuse
2. DEFOG Fuse
3. DEFOG Relay
4. Defogger Switch (in A/C Panel Switch)
5. Defogger Wire
6. Wire HarnessBE±14
BE±14
BE±14
BE±65
BE±65
±
Mirror defogger does not operate.
1. MIR±HTR Fuse
2. HTR Fuse
3. Mirror Heater Relay
4. Mirror Heater
5. Wire HarnessBE±14
BE±14
BE±65
BE±65
±
POWER WINDOW CONTROL SYSTEM
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
SymptomSuspect AreaSee page
All the power windows do not operate.
(Power door lock system is normal.)
1. POWER MAIN Relay
2. Driver Door ECU (Power Window Master Switch)
3. Body ECU
4. Wire HarnessBE±69
DI±1788
±
±
Only the driver's window does not operate.
1. Power Window Motor
2. Power Window Pulse Sensor Circuit
3. Power Window Limit Switch Circuit
4. Driver Door ECU (Power Window Master Switch)BE±69
DI±1803
DI±1800
±
ºWindow lock functionº does not operate.Driver Door ECU (Power Window Master Switch)BE±69
Only the rear LH window does not operate.
1. Power Window Motor
2. Power Window Switch
3. Body ECUBE±69
BE±69
±
Only the rear RH window does not operate.
1. Power Window Motor
2. Power Window Switch
3. Body ECUBE±69
BE±69
±
Only the front passenger's window does not operate.
1. Power Window Motor
2. Power Window Pulse Sensor Circuit
3. Power Window Limit Switch Circuit
4. Passenger Door ECUBE±69
DI±1841
DI±1838
±
The Key related power window operations do not operate with
driver side door key cylinder.
(Master switch operation is normal.)1. Door Key Lock and Unlock Switch Circuit
2. Driver Door ECU (Power Window Master Switch)DI±1791
±
º Auto up º or º Auto down º does not operate. *1
1. Power Window Pulse Sensor Circuit
2. Power Window Limit Switch Circuit
3. Driver Door ECU (Power Window Master Switch)DI±1803
DI±1800
±
*1: º Auto up º or º Auto down º may not function when the manual switch is pressed and held for 2 sec. or
more with the window glass fully open or closed. In this case, by performing a sequence of the window glass
operations (full open, fully close and then half open), the function can be restored. If not, replace the driver
door ECU or passenger door ECU.

± BODY ELECTRICALTROUBLESHOOTING
BE±9
3413 Author: Date:
2005 SEQUOIA (RM1146U)
POWER DOOR LOCK CONTROL SYSTEM
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
SymptomSuspect AreaSee page
All the doors cannot be locked or unlocked.
(Power window control system is normal.)1. Door Unlock Detection Switch
2. Door Key Lock and Unlock Switch
3. Driver Door ECUBE±79
BE±79
±
Only one back lock control does not operate.
1. Back Door Lock Motor
2. Back Door Unlock Detection Switch
3. Back Door Key Lock and Unlock Switch
4. Back Door ECUBE±79
BE±79
BE±79
±
Driver door key related function does not operate.1. Door Key Lock and Unlock Switch
2. Driver Door ECUBE±79
±
Front passenger door key related function does not operate.1. Door Key Lock and Unlock Switch
2. Passenger Door ECUBE±79
±
Back door key related function does not operate.1. Door Key Lock and Unlock Switch
2. Back Door ECUBE±79
±
THEFT DETERRENT SYSTEM
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
SymptomSuspect AreaSee page
The theft deterrent system cannot be set.
1. Key Unlock Warning Switch Circuit
2. Door Unlock Detection Switch Circuit (Driver Door ECU)
Door Unlock Detection Switch Circuit (Passenger Door
ECU)
Door Unlock Detection Switch Circuit (Back Door ECU)
Door Unlock Detection Switch Circuit (Body ECU)
3. Engine Hood Courtesy Switch Circuit
4. Back Door Courtesy Light Switch
5. Courtesy Light Switch Circuit
6. Glass Breakage Sensor Circuit (*1)
7. Body ECUDI±1715
DI±1791
DI±1829
DI±1869
DI±1723
DI±1725
DI±1864
DI±1728
DI±1774
±
The system cannot be canceled when the ignition switch is turned
ON with a key.
1. AM1 Fuse
2. AM2 Fuse
3. Key Unlock Warning Switch Circuit
4. Ignition Switch
5. Body ECUBE±14
BE±14
DI±1715
BE±24
±
The system cannot be canceled when the back door is unlocked
with a key.
1. Back Door Unlock Detection Switch Circuit
2. Back Door Key Lock and Unlock Switch Circuit
3. Back door ECU
4. Body ECUDI±1869
DI±1882
±
±
The system does not operate when the engine hood is opened.1. Engine Hood Courtesy Switch Circuit
2. Body ECUDI±1725
±
Some of the system does not operate.
(Headlight does not come on.)
1. Bulb
2. HEAD Relay
3. DIMMER Relay
4. DRL No. 4 Relay
5. Headlight Dimmer Switch
6. Light Control Switch
7. Wire Harness
8. Body ECU±
BE±27
BE±27
BE±27
BE±27
BE±27
±
±

BE±10
± BODY ELECTRICALTROUBLESHOOTING
3414 Author: Date:
2005 SEQUOIA (RM1146U) Some of the system does not operate.
(Taillight does not come on.)
1. TAIL Fuse
2. TAILLIGHT Relay
3. Light Control Switch
4. Wire Harness
5. Body ECUBE±14
BE±27
BE±27
±
±
Some of the system do not operate.
(Theft deterrent horn or vehicle horn does not sound.)
1. HORN Fuse
2. SECURITY HORN Fuse
3. HORN Relay Circuit
4. Theft Deterrent Horn Circuit
5. Horn
6. Body ECUBE±14
BE±14
BE±145
BE±92
BE±145
±
While the warning is given, the system cannot be canceled by
unlocking the door with a key or transmitter.
1. Door Key Lock and Unlock Switch Circuit (Driver Door
ECU)
Door Key Lock and Unlock Switch Circuit (Passenger
Door ECU)
Door Key Lock and Unlock Switch Circuit (Back Door
ECU)
2. Body ECUDI±1794
DI±1832
DI±1882
±
*1: w/ Glass breakage sensor
WIRELESS DOOR LOCK CONTROL SYSTEM
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
HINT:
Troubleshooting of the wireless door lock control system is based on the premise that the door lock
control system operates normally. Accordingly, before troubleshooting the wireless door lock control
system, first make certain that the door lock control system operates normally.
If the trouble still reappears even though there are no abnormalities in any of the other circuits, check
and replace the Wireless Door Lock Control Receiver as the last step.
SymptomSuspect AreaSee page
All functions of wireless door lock control system do not operate.
1. Transmitter
2. Wireless Door Lock Control Receiver Circuit
3. Body ECUBE±98
DI±1737
±
Wireless door lock operates, but the buzzer does not sound.
(The buzzer does not sound when the customize function prohib-
its.)1. Wireless Door Lock Buzzer Circuit
2. Body ECUDI±1741
±
POWER SEAT CONTROL SYSTEM (w/o Driving Position Memory)
SymptomSuspect AreaSee page
Both Driver and Passenger Power seats do not operate.1. PWR SEAT Fuse
2. Wire HarnessBE±14
±
Driver's seat does not operate.1. Power Seat Switch (D)
2. Wire HarnessBE±109
±
Passenger's seat does not operate.1. Power Seat Switch (P)
2. Wire HarnessBE±109
±
ºSlide operationº does not operate.
1. Power Seat Switch (D, P)
2. Slide Motor (D, P)
3. Wire HarnessBE±109
BE±109
±
ºFront Vertical Operationº does not operate.
1. Power Seat Switch (D)
2. Front Vertical Motor (D)
3. Wire HarnessBE±109
BE±109
±
ºLifter Operationº does not operate.
1. Power Seat Switch (D)
2. Lifter Motor (D)
3. Wire HarnessBE±109
BE±109
±

± BODY ELECTRICALTROUBLESHOOTING
BE±11
3415 Author: Date:
2005 SEQUOIA (RM1146U) ºReclining Operationº does not operate.
1. Power Seat Switch (D, P)
2. Reclining Motor (D, P)
3. Wire HarnessBE±109
BE±109
±
ºLumbar Support Operationº does not operate.
1. Power Seat Switch (D)
2. Lumbar Support Motor (D)
3. Wire HarnessBE±109
BE±109
±
(D): Driver's Seat
(P): Passenger's Seat
POWER SEAT CONTROL SYSTEM (w/ Driving Position Memory)
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
SymptomSuspected AreaSee Page
Power seat control system abnormal operation.See DIAGNOSIS SYSTEMDI±1505
POWER MIRROR CONTROL SYSTEM (w/o Driving Position Memory)
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
SymptomSuspect AreaSee page
Mirror does not operate.1. Mirror Switch
2. Wire HarnessBE±115
±
Mirror operates abnormally.
1. Mirror Switch
2. Mirror Motor
3. Wire HarnessBE±115
BE±115
±
POWER MIRROR CONTROL SYSTEM (w/ Driving Position Memory)
SymptomSuspect AreaSee page
Remote control mirror LH only does not operate.
(w/ Driving position memory)1. Remote control mirror motor LH circuit
2. Remote control mirror position sensor LH circuit
3. Driver door ECUDI±1808
DI±1810
±
Remote control mirror RH only does not operate.
(w/ Driving position memory)1. Remote control mirror motor RH circuit
2. Remote control mirror position sensor RH circuit
3. Passenger door ECUDI±1845
DI±1847
±
ELECTRO CHROMIC MIRROR SYSTEM
SymptomSuspect AreaSee page
Electro Chromic Inner Mirror does not operate.
1. ECU±IG Fuse
2. Electro Chromic Inner Mirror
3. Wire HarnessBE±14
BE±122
±
SEAT HEATER SYSTEM
SymptomSuspect AreaSee page
Seat heaters do not operate.
(Driver's and Passenger's)
1. SEAT HTR Fuse
2. Seat Heater Switch (D, P)
3. Seat Heater
4. Wire HarnessBE±14
BE±124
BE±124
±
Driver's seat heater does not operate.1. Seat Heater Switch (D, P)
2. Wire HarnessBE±124
±
Passenger's seat heater does not operate.1. Seat Heater Switch (D, P)
2. Wire HarnessBE±124
±
Seat heater temperature is too hot.Seat HeaterBE±124
AUDIO SYSTEM
SymptomSuspect AreaSee page
Audio system abnormal operation.See DIAGNOSIS SYSTEMDI±1962

BE±12
± BODY ELECTRICALTROUBLESHOOTING
3416 Author: Date:
2005 SEQUOIA (RM1146U)
NAVIGATION SYSTEM
SymptomSuspect AreaSee page
Navigation system abnormal operation.See DIAGNOSIS SYSTEMDI±2172
REAR SEAT ENTERTAINMENT SYSTEM
SymptomSuspect AreaSee page
Rear seat entertainment system abnormal operation.See DIAGNOSIS SYSTEMDI±2083
REAR SEAT AUDIO SYSTEM
SymptomSuspect AreaSee page
Rear seat audio system abnormal operation.See DIAGNOSIS SYSTEMDI±2048
CLOCK SYSTEM
SymptomSuspect AreaSee page
Clock does not operate.TROUBLESHOOTING NO.1BE±127
Clock loses or gains time.TROUBLESHOOTING NO.2BE±127
GARAGE DOOR OPENER SYSTEM
SymptomSuspect AreaSee page
The equipment of which code has been registered does not oper-
ate.1. Garage Door Opener Switch
2. Wire Harness
3. *BE±134
±
±
LED does not come on. (Even though either switch is pressed.)1. Garage Door Opener Switch
2. Wire HarnessBE±134
±
LED does not come on. (Only one switch is pressed.)Garage Door Opener SwitchBE±134
* As the GARAGE DOOR OPENER on the vehicle side seems to be normal, check the OPENER on the
equipment side, of which code has been registered.
ENGINE IMMOBILISER SYSTEM
SymptomSuspect AreaSee page
Engine immobilizer system does not operate.See DIAGNOSIS SYSTEMBE±143
HORN SYSTEM
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
SymptomSuspect AreaSee page
Horn system does not operate.
1. HORN Fuse
2. HORN Relay Circuit
3. Horn Switch Circuit
4. Horn
5. Body ECUBE±14
BE±145
BE±145
BE±145
±
Horn blow all the time.
1. HORN Relay Circuit
2. Horn Switch Circuit
3. Body ECUBE±145
BE±145
±
One horn operates but the other horn does not operate.1. Horn
2. Wire HarnessBE±145
±

± BODY ELECTRICALTROUBLESHOOTING
BE±13
3417 Author: Date:
2005 SEQUOIA (RM1146U)
BACK DOOR POWER WINDOW CONTROL SYSTEM
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
SymptomSuspect AreaSee page
Back door power window does not operate.
1. Back Door Power Window Motor Circuit
2. Window Pulse Sensor Circuit
3. Rear Wiper Motor Circuit
4. Back Door Control Light Switch Circuit
5. Back Door ECU
6. Body ECUIN±35
DI±1877
DI±1880
DI±1864
±
±
TRAILER TOWING
SymptomSuspect AreaSee page
Trailer towing does not operate.
1. TOWING Fuse
2. TOWING TAIL Fuse
3. TOWING BRK Fuse
4. TOWING TAIL Relay
5. BATT CHARGE Relay
6. Towing Converter Relay
7. Brake Controller
8. Wire HarnessBE±14
BE±14
BE±14
BE±148
BE±148
BE±148
BE±148
±

I28398
Fuses:Relays:
1. *1 H±LP LL
2. *1 H±LP RL
3. STA
4. *1 H±LP LH
5. *1 H±LP RH
A
G
FED
BC
6
1034
5
A. AIR SUS Relay
B. CDS FAN Relay
C. MG CLT Relay
D. A/F Relay
E. *1 DRL No. 4 Relay
F. DIMMER Relay
G. ST Relay
*1 w/ Daytime Running Light Engine Room R/B No. 2
7
8
911
12
6. AIR SUS No. 2
7. RSE
8. A/F
9. SECURITY
10. DEF I/UP
11. ±
12. ±12
10 A
10 A
7.5 A
10 A
10 A
10 A
7.5 A
20 A
15 A
7.5 A
± BODY ELECTRICALPOWER SOURCE
BE±15
3419 Author: Date:
2005 SEQUOIA (RM1146U)

I18638
A. Taillight Relay Instrument Panel J/B:
Relays:
B. Back±Up Light Relay
C. ACC Relay
D. Power Main Relay
E. Fog Light Relay
F. MIRROR HEATER Relay
G. FLASHER Relay
H. SEAT HEATER Relay
Fuses:
1. TAIL Fuse
2. PWR No. 4 Fuse
3. PANEL Fuse
4. ECU±IG Fuse
123
4567
89
1011
12
1314
A
BC
DE
GH
F
15
1617 18 19
20
21 22 23
2425
265. CIG Fuse
6. PWR No. 1 Fuse
7. HTR Fuse
8. WSH Fuse
9. RAD No. 2 Fuse
10. WIP Fuse
11. FOG Fuse
12. AC INV Fuse 15 A
13. 4WD Fuse14. IGN1 Fuse
15. GAUGE Fuse
16. IGN 2 Fuse
17. STOP Fuse
18. SUN ROOF Fuse
19. PWR OUTLET Fuse
20. PWR No. 3 Fuse
21. OBD Fuse
22. PWR No. 2 Fuse
23. SEAT HTR Fuse
24. PWR SEAT Fuse
25. AM1 Fuse
26. PWR No. 5 Fuse 15 A 10 A
20 A
7.5 A
10 A
15 A
25 A
10 A
25 A
7.5 A
25 A
15 A
20 A15 A
20 A
15 A
25 A
15 A
20 A
7.5 A
25 A
15 A
30 A
40 A
30 A BE±16
± BODY ELECTRICALPOWER SOURCE
3420 Author: Date:
2005 SEQUOIA (RM1146U)