Toyota Sequoia (2005). Manual - part 856

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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 ECU

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Driver door key related function does not operate.

1. Door Key Lock and Unlock Switch

2. Driver Door ECU

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Front passenger door key related function does not operate.

1. Door Key Lock and Unlock Switch

2. Passenger Door ECU

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Back door key related function does not operate.

1. Door Key Lock and Unlock Switch

2. Back Door ECU

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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.

Symptom

Suspect Area

See 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 ECU

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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 ECU

DI–1715

BE–24

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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 ECU

DI–1869

DI–1882

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The system does not operate when the engine hood is opened.

1. Engine Hood Courtesy Switch Circuit

2. Body ECU

DI–1725

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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

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BE–27

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BE–10

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BODY ELECTRICAL

TROUBLESHOOTING

3414

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 ECU

BE–27

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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 ECU

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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 ECU

DI–1794

DI–1832

DI–1882

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*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.

Symptom

Suspect Area

See page

All functions of wireless door lock control system do not operate.

1. Transmitter

2. Wireless Door Lock Control Receiver Circuit

3. Body ECU

BE–98

DI–1737

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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 ECU

DI–1741

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POWER SEAT CONTROL SYSTEM (w/o Driving Position Memory)

Symptom

Suspect Area

See page

Both Driver and Passenger Power seats do not operate.

1. PWR SEAT Fuse

2. Wire Harness

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Driver’s seat does not operate.

1. Power Seat Switch (D)

2. Wire Harness

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Passenger’s seat does not operate.

1. Power Seat Switch (P)

2. Wire Harness

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”Slide operation” does not operate.

1. Power Seat Switch (D, P)

2. Slide Motor (D, P)

3. Wire Harness

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”Front Vertical Operation” does not operate.

1. Power Seat Switch (D)

2. Front Vertical Motor (D)

3. Wire Harness

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”Lifter Operation” does not operate.

1. Power Seat Switch (D)

2. Lifter Motor (D)

3. Wire Harness

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BODY ELECTRICAL

TROUBLESHOOTING

BE–11

3415

”Reclining Operation” does not operate.

1. Power Seat Switch (D, P)

2. Reclining Motor (D, P)

3. Wire Harness

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”Lumbar Support Operation” does not operate.

1. Power Seat Switch (D)

2. Lumbar Support Motor (D)

3. Wire Harness

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(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.

Symptom

Suspected Area

See Page

Power seat control system abnormal operation.

See DIAGNOSIS SYSTEM

DI–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.

Symptom

Suspect Area

See page

Mirror does not operate.

1. Mirror Switch

2. Wire Harness

BE–115

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Mirror operates abnormally.

1. Mirror Switch

2. Mirror Motor

3. Wire Harness

BE–115

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POWER MIRROR CONTROL SYSTEM (w/ Driving Position Memory)

Symptom

Suspect Area

See 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 ECU

DI–1808

DI–1810

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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 ECU

DI–1845

DI–1847

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ELECTRO CHROMIC MIRROR SYSTEM

Symptom

Suspect Area

See page

Electro Chromic Inner Mirror does not operate.

1. ECU–IG Fuse

2. Electro Chromic Inner Mirror

3. Wire Harness

BE–122

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SEAT HEATER SYSTEM

Symptom

Suspect Area

See 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 Harness

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Driver’s seat heater does not operate.

1. Seat Heater Switch (D, P)

2. Wire Harness

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Passenger’s seat heater does not operate.

1. Seat Heater Switch (D, P)

2. Wire Harness

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Seat heater temperature is too hot.

Seat Heater

AUDIO SYSTEM

Symptom

Suspect Area

See page

Audio system abnormal operation.

See DIAGNOSIS SYSTEM

DI–1962

BE–12

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BODY ELECTRICAL

TROUBLESHOOTING

3416

NAVIGATION SYSTEM

Symptom

Suspect Area

See page

Navigation system abnormal operation.

See DIAGNOSIS SYSTEM

DI–2172

REAR SEAT ENTERTAINMENT SYSTEM

Symptom

Suspect Area

See page

Rear seat entertainment system abnormal operation.

See DIAGNOSIS SYSTEM

DI–2083

REAR SEAT AUDIO SYSTEM

Symptom

Suspect Area

See page

Rear seat audio system abnormal operation.

See DIAGNOSIS SYSTEM

DI–2048

CLOCK SYSTEM

Symptom

Suspect Area

See page

Clock does not operate.

TROUBLESHOOTING NO.1

BE–127

Clock loses or gains time.

TROUBLESHOOTING NO.2

BE–127

GARAGE DOOR OPENER SYSTEM

Symptom

Suspect Area

See page

The equipment of which code has been registered does not oper-

ate.

1. Garage Door Opener Switch

2. Wire Harness

3. *

BE–134

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LED does not come on. (Even though either switch is pressed.)

1. Garage Door Opener Switch

2. Wire Harness

BE–134

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LED does not come on. (Only one switch is pressed.)

Garage Door Opener Switch

BE–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

Symptom

Suspect Area

See page

Engine immobilizer system does not operate.

See DIAGNOSIS SYSTEM

BE–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.

Symptom

Suspect Area

See page

Horn system does not operate.

1. HORN Fuse

2. HORN Relay Circuit

3. Horn Switch Circuit

4. Horn

5. Body ECU