Toyota Sequoia (2005). Manual — part 471

DID98–01

I28587

From Battery

Driving Position Memory Switch

BODY ECU

Courtesy SW (D)

MM

Remote Control Mirror Switch

RH

Outer
Mirror LH
(Retract
Motor)

M1

M2

MM

M1

DCTY

PCTY

RRCY

RLCY

HCTY

KSW

LSWR

LSWL

PKB

WIG

IG

ACC

BECU

S+B

BDR

ACT+

ACTD

ACT–

M2

MIRB

MIRS

MIRF

M+

MSW

E

B

MF

E2

MR

Door Lock Motor

Front
LH

Front
RH

Rear
LH

Rear
RH

Courtesy SW (P)

Courtesy SW (RR)

Courtesy SW (RL)

Hood Courtesy SW

Key Unlock Warning SW

Door Unlock Detection
SW Rear RH

Door Unlock Detection
SW Rear LH

Parking Brake SW

Battery

AM1

ALT

ACC

IG1

Ignition Switch

WSH

ECU–IG

RAD No. 2

ECU–B

DOOR No. 2

SECURITY
HORN

AM1

–

DIAGNOSTICS

BODY CONTROL SYSTEM

DI–1679

1873

SYSTEM DIAGRAM

I28588

BEAN

BODY ECU

Hi Beam Indicator

Driver Door ECU

A/C ECU

Sliding Roof
Control ECU

MPX1

MPX2

MPX3

HIND

HRLY

H–ON

DIM

HEAD

TAIL

A

HF

HI

FOG

Combination Meter

From
Battery

HEAD

MAIN

Headlight

DRL (*1)

Headlight

DRL No. 4

H–LP(*2)

DRL

H–LP(*2)

Headlight

Headlight

H–LP(*1)

H–LP(*1)

H–LP(*1)

H–LP(*1)

DIMMER

(*2)

(*2)

Combination Switch

Light Control
Switch

Dimmer
Switch

Fog Light
Switch

DRL
Resister

*1: w/ DRL
*2: w/o DRL

DI–1680

–

DIAGNOSTICS

BODY CONTROL SYSTEM

1874

I28734

BODY ECU

Back Door
Power Window SW

Rear Wiper
and
Washer
Switch

Rear Washer
Motor

Theft Deterrent Horn

Light
Control
Sensor

Wireless
Door Lock
Receiver

ECU–B

From
Battery

DLC3

From
Battery

POWER MAIN

Power
Window SW
(RR)

Power
Window
Motor (RR)

PWR
No. 3

PWR
No. 2

Power
Window SW
(RL)

Power
Window
Motor (RL)

From
Battery

From
Battery

DOME

HORN

Interior Light

HORN

Vehicle Horn

Combination Meter

Security Indicator

Horn Switch

Glass
Breakage
Sensor ECU

Wireless Buzzer

ECU–B

HTR

PWS

BUP

BDN

RWLS

RWC1

RWW

SH

TRCY

RRU

RRD

RLU

RLD

ILE

CLTB

CLTS

CLTE

HR

RDA

PRG

GND1

IND

HORN

BZR

OBD2

DOP

Microphone

From
Battery

–

DIAGNOSTICS

BODY CONTROL SYSTEM

DI–1681

1875

DI1OD–22

Customer Problem Analysis

Vehicle Brought to Workshop

Problem Symptom Confirmation

Symptom Simulation

Symptom does not
occur

Circuit Inspection

Identification of Problem

Repair

Confirmation Test

End

Titles inside

are titles of pages in this

manual, with the page number indicated in
the bottom portion. See the indicated pages
for detailed explanations.

1

2

3

6

5

8

P.

IN–24

P.

DI–1683

P.

DI–1700

–

DI–1774

Symptom
occurs

Step 4, 6, 8: Diagnostic steps permitting the use of the hand–held tester.

7

Problem Symptoms Table

P.

DI–1686

P.

DI–1904

Multiplex communication system inspection *

4

*: Confirm that there is no trouble by DTC check.

DI–1682

–

DIAGNOSTICS

BODY CONTROL SYSTEM

1876

HOW TO PROCEED WITH TROUBLESHOOTING

HINT:
This ECU is connected to the multiplex communication system. Therefore, be sure to check that there is no
troubles in the multiplex communication system before performing the troubleshooting.