Page 1807 of 4323
DID8P±01
I28566
Seat Position
Control ECU
A/C ECU (Integration
Control Panel) BEANBody ECU
Back Door ECU
ECM
Light Control
Rheostat
Vehicle Speed
Sensor
Oil Pressure
Sender Gauge
Fuel Sender Gauge
Seat Inner
Belt Switch
Park/neutral
Position Switch
Turn Signal
Flasher Relay
Washer Level SensorKey Unlock
Warning Switch
Door Courtesy
Lamp Switch
Parking Brake Switch
Transponder
Key ECU
4WD Control ECU
Airbag Sensor
Center ECU Combination
Meter
Skid Control ECU
Suspension
Control ECU
Translate ECU
Overhead Module
(Garage Door
Opener)BEAN
BEAN
BEAN
BEAN
BEAN BEAN
± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1605
1799 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DIAGRAM
Page 1808 of 4323
DI±1606
± DIAGNOSTICSCOMBINATION METER SYSTEM
1800 Author: Date:
2005 SEQUOIA (RM1146U)
Input and output signals of each ECU
Transmitting ECU
(transmitter)Receiving ECUSignalsCommunication
method
A/C ECU
Combination meter
Driver door control ECU
Passenger door control ECU
Temperature dataBEAN
A/C ECUCombination meterEngine coolant temperature dataBEAN
Combination meter
A/C ECU
Body ECU
Driver door control ECU
Passenger door control ECU
Back door ECU
Vehicle speed signalBEAN
Combination meterBody ECU
Seat control ECUShift position signalBEAN
Combination meter
A/C ECU
Body ECU
Driver door control ECU
Passenger door control ECU
Back door ECU
Meter activation signalBEAN
Combination meterA/C ECUDisplay unit demand signalBEAN
Combination meterBody ECUEngine system signalBEAN
Body ECU
A/C ECU
Combination meter
Driver door control ECU
Passenger door control ECU
Seat control ECU
Sliding roof control ECU
Back door ECU
Diagnosis tool demand signalBEAN
Body ECUA/C ECU
Combination meterBody control system signal (HEAD
signal, TAIL signal)BEAN
Body ECU
Combination meter
Driver door control ECU
Passenger door control ECU
Seat control ECU
Sliding roof control ECU
Back door ECU
Body control system signal (IG
signal, ACC signal, All door cour-
tesy lamp signal, Door lock signal,
Door unlock signal)
BEAN
Body ECU
Combination meter
Driver door control ECU
Passenger door control ECU
Seat control ECU
Sliding roof control ECU
Back door ECU
Body ECU activation signalBEAN
Body ECU
Combination meter
Driver door control ECU
Seat control ECUBody control system signal (KSW
signal)BEAN
Body ECU
Combination meter
Driver door control ECU
Passenger door control ECU
Seat control ECUDoor condition signal (Driver side
door courtesy lamp signal, Pas-
senger side door courtesy signal)
BEAN
Page 1809 of 4323
± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1607
1801 Author: Date:
2005 SEQUOIA (RM1146U)Driver door control ECU
Combination meter
Body control ECU
Passenger door control ECU
Seat control ECU
Sliding roof control ECU
Back door ECU
Driver door control ECU activation
signalBEAN
Passenger door control ECU
Combination meter
Body control ECU
Driver door control ECU
Seat control ECU
Sliding roof control ECU
Back door ECU
Passenger door control ECU ac-
tivation signalBEAN
Sliding roof control ECU
Combination meter
Body control ECU
Driver door control ECU
Passenger door control ECU
Back door ECU
Sliding roof control ECU activation
signalBEAN
Seat control ECU
Combination meter
Body control ECU
Driver door control ECU
Passenger door control ECU
Seat control ECU activation signalBEAN
Back door ECU
Combination meter
Body control ECU
Driver door control ECU
Passenger door control ECU
Seat control ECU
Back door control ECU activation
signalBEAN
A/C ECU
Combination meter
Driver door control ECU
Passenger door control ECU
Seat control ECU
Sliding roof control ECU
Back door ECU
Back door ECUDiagnosis tool answer signalBEAN
Page 1826 of 4323
Wire harness side
1
2
3
4
5
6
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
401
2
3
4
5
8 6
10
11
12
13
14
15
16
17
18
19
21
23
24
Terminal No.
Translate ECU
ECM
STA Fuse
Front Seat Inner Belt LH (Buckle Switch)
Overhead Module (Garage Door Opener)
Overhead Module (Garage Door Opener)
Washer Level Sensor
ECM
ECM (*1)
Transponder Key Computer
Body ECU
ECM
ECM
Tire Pressure Monitor ECU
Injector No. 1
Light Control Rheostat
ECM
Speed Sensor
4P OUT (Other Parts)
Fuel Sender Gauge
Oil Pressure Sender Gauge
IGN Fuse
Airbag Sensor Assembly
Memory Seat ECU and SW (*2)
Back Door ECU
Integration Control and Panel
Turn Signal Flasher Relay
Park/Neutral Position Switch
Airbag Sensor AssemblyTranslate ECU
Translate ECU
Skid Control ECU
4WD Control ECU
Alternator
Speed Sensor
Fuel Sender Gauge
Ground
Suspension Control ECU
Body ECU (*4)
Body ECU (*3)
Turn Signal Flasher Relay
Skid Control ECU
ECU±B Fuse
IGN1 Fuse Connectors:
Terminal No.
Wire harness side
C5
C64WD Control ECU
4WD Control ECU
Suspension Control ECU
Suspension Control ECU
Suspension Control ECU
*1: 4WD
*2: w/ Driving Position Memory
*3: w/ Daytime Running Light
*4: w/o Daytime Running LightPark/Neutral Position Switch
Park/Neutral Position Switch
Park/Neutral Position Switch
Park/Neutral Position Switch
Park/Neutral Position Switch DI±1624
± DIAGNOSTICSCOMBINATION METER SYSTEM
1818 Author: Date:
2005 SEQUOIA (RM1146U)
Page 1900 of 4323
DI94R±07
I28393
Hood Courtesy Switch Engine Room J/B
ECU±B Fuse
Door No. 2 Fuse
H±LP RH Fuse (*2)
H±LP LH Fuse (*2)
DRL Fuse (*1)
Rear Washer Motor
Horn
Headlight
Rear washer switch
Ignition Switch
Key Unlock Switch
DLC3 Body ECU
Instrument Panel J/B
ECU±IG Fuse
RAD No. 2 Fuse
FOG Fuse
FOG LIGHT Relay
POWER MAIN Relay
WSH Fuse
STOP Fuse
TAILLIGHT Relay Back Door Power
Window SwitchTheft Horn
Engine Room R/B
No.2
DIMMER Relay
DRL No. 4 Relay
H±LP RH Fuse (*1)
H±LP LH Fuse (*1)
H±LP RL Fuse (*1)
H±LP LL Fuse (*1)
Fog Light
Wireless Door
Control Receiver Wireless Door Lock Buzzer
Combination Meter Memory Seat Switch
(*1): w/ Daytime Running Light
(*2): w/o Daytime Running Light (Located behind
the instrument panel)
(Located behind
the heater control panel)
DOME Fuse
HEAD Relay
HORN Relay
DOME Fuse
Automatic Light Control Sensor
Stop Light Switch
Remote Control Mirror SwitchGlass Breakage
Sensor Microphone Glass Breakage
Sensor ECU
Combination Switch
Light Control Switch
Headlight Dimmer Switch
Fog Light Switch DI±1698
± DIAGNOSTICSBODY CONTROL SYSTEM
1892 Author: Date:
2005 SEQUOIA (RM1146U)
PARTS LOCATION
Page 2090 of 4323
DIDF7±01
I28466
DLC 3Front
Passenger
Door ECUBody ECU
A/C ECU Combination
MeterBack Door
ECUDriver Door
ECU
MPX1
MPX2
MPX3
Slide Roof
ECU Memory
Seat ECU
& SwitchMPX1 MPX2 MPX1 MPX2 MPX1 MPX2
MPX± MPX+
MPX1 MPX1
SILAutomatic Light
Control Sensor
Wireless Door
Control Receiver
Airbag Sensor Assy
Diagnostic Bus
BEANCLTS
CLTB
CLTE
PRG
GSW
OBD2PDA DI±1888
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2082 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DIAGRAM
Page 2094 of 4323
DI3IO±11
Customer Problem Analysis
Vehicle Brought to Workshop
Problem Symptom ConfirmationSymptom Simulation Problem does not
occur
Check DTC
Normal code
Problem Symptoms Table
Identification of Problem
Repair
Confirmation Test
EndTitles 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
23
4
6
8P. IN±24
*1P. DI±1893
P. DI±1904Malfunction code
Problem
occurs
Circuit Inspection
P. DI±1908 ± DI±1952
See page
Body control system
Driver door control system
Passenger door control systemSystem
DI±1682
DI±1780
DI±1816
DI±1610
Step 4, 8: Diagnostic steps permitting the use of the hand±held tester.*15
7
Combination meter system
Slide roof control system
DI±1662 DI±1852 Back door control system
Power seat control system
w/ Driving position memoryDI±1505
Supplemental restraint system
Air conditioning systemDI±1126
DI±2301 DI±1892
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2086 Author: Date:
2005 SEQUOIA (RM1146U)
HOW TO PROCEED WITH TROUBLESHOOTING
Perform troubleshooting in accordance with the procedure on the following page.
Page 2095 of 4323
DI3IP±10
MULTIPLEX COMMUNICATION SYSTEM Check Sheet
Inspector 's name:
Customer 's Name
Date VehicleVIN
Production Date
Licence Plate No.
Odometer Reading / /km
mile
Weather Conditions
When Problem
Occurred
Date Problem First Occurred
Frequency Problem Occurs
Weather
/ /
Once only Brought in
Malfunction
System
Outdoor Temperature
Fine Cloudy Rainy Snowy
Various/Others
Hot Warm Cool
Cold (Approx. °F ( °C))
Constant Sometimes ( times per day, month)
Driver Door Control System
Passenger Door Control System
Combination Meter System
Body Control System
Back Door Control System
Slide Roof Control System
Power Seat Control System (w/ Driving Position Memory)
Supplemental Restraint System
Air Condition System
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1893
2087 Author: Date:
2005 SEQUOIA (RM1146U)
CUSTOMER PROBLEM ANALYSIS CHECK
