Page 1801 of 4323
I24837
IGTransponder Key ECU
D 3
T16
OJ43
J/C W±L
8 OP3 D6
DLC3
CG
4A
AO
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
DI±1599
1793 Author: Date:
2005 SEQUOIA (RM1146U)
Diagnosis Circuit
CIRCUIT DESCRIPTION
This circuit sends a signal to the ECU that outputs DTCs.
WIRING DIAGRAM
DIABK±03
Page 1802 of 4323
A04550
CGOP3
1 234 5 678
91011 13 151612 14
DI±1600
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
1794 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check voltage between terminals OP3 and CG of DLC3.
PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals OP3 and CG of the
DLC3.
OK:
Voltage: 10 to 14 V
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI±1573).
NG
2 Check harness and connector between transponder key ECU and DLC3, DLC3
and body ground (See page IN±35).
NG Repair or replace harness or connector.
OK
Replace transponder key ECU
(See page IN±35).
Page 1803 of 4323
DID8N±01
± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1601
1795 Author: Date:
2005 SEQUOIA (RM1146U)
COMBINATION METER SYSTEM
PRECAUTION
NOTICE:
When disconnecting the battery terminal, initialize the following system after the terminal is recon-
nected.
System NameSee Page
Back Door Power Window Control SystemBE±77
Page 1804 of 4323
DID8O±01
I28426
Fuel Tank
Fuel Sender Gauge
DI±1602
± DIAGNOSTICSCOMBINATION METER SYSTEM
1796 Author: Date:
2005 SEQUOIA (RM1146U)
LOCATION
Page 1805 of 4323
I28425
Brake Master Cylinder
Brake Fluid Level Warning Switch
Engine Room R/B
ECU±B Fuse
Light Control RheostatCombination Meter Assembly
Instrument Panel J/B
IGN 2 Fuse
GAUGE Fuse
Parking Brake SwitchIgnition Switch
Passenger Seat
Belt Warning
Skid Control ECU
± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1603
1797 Author: Date:
2005 SEQUOIA (RM1146U)
Page 1806 of 4323
I28825
Engine Coolant Temperature Sender Gauge
Oil Pressure Sender DI±1604
± DIAGNOSTICSCOMBINATION METER SYSTEM
1798 Author: Date:
2005 SEQUOIA (RM1146U)
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