TOYOTA HIGHLANDER 2001 Service Repair Manual

2005 HIGHLANDER (EWD592U)
314
I GROUND POINT
Brake Warning SW
Skid Control
ECU with
ActuatorFront Fog Light LH
Washer Level
Sensor
Front Turn Signal
Light RH
Headlight RH
(
Low Beam)
Headlight LH
(
Low Beam)
STARTER Relay
Pressur e SW
INVERTER Relay Engine Hood
Cour tesy SW
Front Turn Signal
Light LH
Headlight LH
(
Low Beam)
Front Fog Light
RHA
A W- B
W- BA
A
A
A
AW- B
W- B
W- B
W- B
W- B
EA EB
J 4
J 3
DRL NO. 3 RelayW- B
W- B(
*1)
(
*1)E12 3
3
W- B DRL NO. 4 RelayW- B
(
*1)
(
*1) 3
3
W- B
(
*1)
A
A
A
A
EHW- B W- B W- B W- B A
A
A
A
EG W- B
W- B
W- B
(
*1)
W- BJ 1 (
GND1)
J 2Front Parking
Light RH AW-B
Fro nt Parking
Light LHA W- BEFI Relay W- BRR DEF Relay W- BA/F Relay W- B
2
2A
2F7
4
A Water Temp. SW No. 1A W- B
W- B
A AW-B2G2FAN NO. 2 Relay W- B
W- B
(
GND2) W- B Skid Control
ECU with
Actuator
Radi ator Fan MotorW- BE11
W- B
(
*1)
2
2
2Front Parking Light
RH
Junction
ConnectorJunction
Connector
Junction
Connector Junction
Connector
Fro nt Parking
Light LH

2005 HIGHLANDER (EWD592U)
315
Data Link
Connector 3
Engine Contr ol
Module
A/C Magnetic Clutch
Combination SW Data Link
Connector 3
Ignition Coil and
Igniter No. 1A
A
A
A
A
ED A IM14
RBR
BR
R
BR
BR
J 7I 6W- B
W- B
W- B Engine Contr ol
Module
A/C Magnetic Clutch
A/C Lock Sensor
Ignition Coil and
Igniter No. 4 Ignition Coil and
Igniter No. 3 Ignition Coil and
Igniter No. 2 Ignition Coil and
Igniter No. 1IM14
BR
E 9
EF W- B W- B
W- B
W- B
W- BW- B
W- B A BR
A
A
EEEngine Contr ol
Module W- B
(
E03)
J 7
* 1 : w/ Daytime Running Light
Ignition Coil and
Igniter No. 2
Ignition Coil and
Igniter No. 3
Ignition Coil and
Igniter No. 4
Ignition Coil and
Igniter No. 5
Ignition Coil and
Igniter No. 6E 6
E 6 W- B
W- B
W- B
W- B
W- B
W- B
W- B
ECW- B
W- B
W- B(
2 AZ- FE)
(
3 MZ- FE)
(
2AZ- FE)
(
3MZ- FE) (
SC)
(
E1)
BR
(
E1) (
SC)
(
E03)
Engine
Control
Module (
E05)
(
E04)
BR
(
E01)
(
E02)
(
E01)
(
E02) IM117
OBR
A Combination SW
IM117
O BR(
E04)
W- B
W- B
Engine
Control
Module (
ME01)
W- B
I 6W- B
Engine
Control
Module (
ME01)
W- B
I 6W- B
Junction
ConnectorJunction
Connector
A/C Lock Sensor

2005 HIGHLANDER (EWD592U)
316
I GROUND POINT
Theft Deterr ent
Indicator Light
Remote Control
Mirror SW
TRAC Off SW
Combination Meter
Seat Heater SW
RH
Option Connector 2
Combination Meter
Fuel Sender A/C Control
Assembly
Blower Resistor
Cigarette Lighter
Fro nt Powe r Out let
Electronically
Controlled
Transmission
Pattern Select SW
Glove Box Light
Body ECU
Main SW
Seat Heater SW LH3F10
II16
IR211 3J6
3J 10
3A6
3G4
3D8
3H10
3B3
3F12
3K73D5
3F11
3E11
3J4
3E10
3K6
3J 11
3B12
3B6 W- B
W- B W- B
W- B
W- B
W- B
W- B
W- B
W- B W- BW- B
W- B
W- B
W- B
W- B
W- B
W- B
R
3F13
3K2
IBW- B
BR BR (
GND2)
Radi o and PlayerBR Telltale Light
AssemblyW- B Gateway ECU3G6
3G5
W- B W- B
Multi- Display 3I6
3I2W- B
W- B 3G9
W- B W- B W- B(
*3) Sliding Roof
Control ECU
Vanity Light LH
Vanity Light RH
Interior Light B 1W- B W- B(
*2)
W- B
W- B Overhead J/BW- B
B 1
W- B
Shift Lock ECU 3D9
W- B
BH114D DO
O Y V W- B* 2 : w/ Moon Roof
* 3 : w/o Moon Roof
3H8
Transmission Shift
Main SWW- B
Navigation
ECU (
GND1)
The ft
Deterrent ECU (
E) (
E)
(
GND)
(
CG) Garage Door Opener
Transmission Control
SW
Indicator Light
Wire Sub Assembly
Junction
Connector J13
Radi o and Player

2005 HIGHLANDER (EWD592U)
317
Turn Signal
Flasher
Heater Relay
Pr essure SW
Steer ing Sensor
SEAT HEATER Relay
Combination SW
Power Window
Master SW
with ECU
Remote Control
Mir ror LH Transponder Key
Computer
Body ECU
Data Link
Connector 3
Key Inter Lock
Solenoid
Remote Control
Mirror RH Door Lock Control
SW Power Window SW
Fron t RH
Door Unlock
Detection SW
Fron t RH
Wireless Door Lock
Buzzer
Br ake Pedal
Load Sensing SW4C44H11
4C6
4G9
4G8 4H7
4J6
4C3
4L9
4G10
4C5 W- B
W- B
W- B
W- B
W- B
W- B
W- B
W- BW- B
W- BW- B
W- B
W- B
B 2 I B 12
W- B
4L8
W- B
IK33
4M3
W- B
4J7 W- B
W- B4L 10 2
IN1 W- B
B 4W- B B 4 B 4
W- BW- B W- B
W- B
4N1
4L7
IC W- B
W- B(
GN D1)
(
CG)
4H5
W- B
W- B W- B
4D4
IL117
W- B W- B
4K8
W- B4D5
IE18
W- B W- B Air bag Sensor
Assembly
Front Wiper Deicer
Front Wiper Motor(
E1)
(
E2)1L9
1L1
1B9
1B8
1D14 W- B
W- B
W- B
W- B
W- B
W- B
W- B
W- B
Combination SW
Blower Motor
Control
Blower Control SW ACC Relay
IG12 W- B
W- B
W- B
IA 1E4
4M6
W- B
IH13
(
GN D)Engine
Control Module (
EOM)
1Unlock Warning SW
Door Lock Motor
Fron t RH
Door Key Lock and
Unlock SW Front RH

2005 HIGHLANDER (EWD592U)
318
I GROUND POINT
Door Lock Motor
Rear RH
Power Window SW
Rear RH BC113
BC112
W- BW- B
BBW- B
W- B
Seat Heater SW RH BM11
W- BW- B
Stereo Power
Amplifier Wireless Door
Lock ECU Yaw Rate Sensor Char coal Canister
Assembly Rear Heater Blower
Motor Rear Heater Relay Rear Heater
Blower SWA
A
A
A
A
A
A
A BJ115 W- B
W- B
W- B
W- B
W- B W- B
W- B
W- B
W- B
BF
W- B
ARear Seat
Entertainment
ECU
(
SELD) (
GND)
J19
Occupant
Classification
ECU BL13
W- B W- B
W- B
W- B C
C
C
W- B
J18
C A
W- B
B A B A
A A Power Seat
Control SW
(
Front Passenger' s
Seat Contr ol)W- B
W- B W- B
(
*4)
(
*5) (
*5) (
*4) (
*4)* 4 : w/ Power Seat(
Front Passenger' s Seat)
* 5 : w/o Power Seat(
Front Passenger' s Seat)
(
E)(
GND) Door Unlock
Detection SW
Rear RH J23(
A)
, J24(
B)
Junction
Connector Junction
Connector
Junction Connector

2005 HIGHLANDER (EWD592U)
319
Power Seat Control
SW (
Driver' s Seat
Lumbar Support
Control) Power Seat Control
SW (
Driver' s Seat
Control)
Seat Heater SW LH
Power Window SW
Rear LH
Door Unlock
Detection SW
Rear LH License Plate Light
Back Door Key Lock
and Unlock SW
Back Door Lock Motor
Rear Interior Light
SW
High Mounted
Stop Light Rear Window
DefoggerA
A
A W- B
W- B
W- B
A W- B
BE
W- B Rear Side Mar ker
Light RH
Rear Side Mar ker
Light LH
Rear Combination
Light LH
Rear Power Outlet
Rear Combination
Light RH
Fue l PumpB
B
B W- B
W- B
W- B
B W- B
W- B
BC B A
BG1 1W- B
W- B
W- B
W- B
BA BB1 12 BB111
W- B W- B W- B
W- B
W- B
W- BJ14 J12
B A
B A
B A
A AB A
W- B
W- B
Voltage Inverter
B 9 Tra ile r Hitch
Towing ConverterB 9
W- B W- B W- B
W- B
W- B
W- BW- B Rear Interior LightW- B
W- B
W- BA
B Door Unlock
Detection SW
J21(
A)
, J22(
B)
Door Lock Motor
Rear LH
Junction
ConnectorJunction
Connector
Junction Connector

2005 HIGHLANDER (EWD592U)
320
I GROUND POINT
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
J139 (3MZ-FE)J439 (3MZ-FE)J1844J141 (2AZ-FE)J441 (2AZ-FE)J1944
J239 (3MZ-FE)J743J21A46 (w/ Power Seat)J241 (2AZ-FE)J1244J22B46 (w/ Power Seat)
J339 (3MZ-FE)J1344J23A46 (w/ Power Seat)J341 (2AZ-FE)J1444J24B46 (w/ Power Seat)
: RELAY BLOCKS
CodeSee PageRelay Blocks (Relay Block Location)
222Engine Room R/B (Engine Compartment Left)
323Engine Room R/B No.3 (Engine Compartment Rear Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CodeSee PageJunction Block and Wire Harness (Connector Location)
1B29Engine Room Main Wire and Instrument Panel J/B (Lower Finish Panel)
1D
1E29Cowl Wire and Instrument Panel J/B (Lower Finish Panel)
1L
()
2A
2F27Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)
2G
gg(g)
3A
3B
3D30
3E
3FInstrument Panel Wire and Center J/B (Behind the Instrument Panel Center)3GInstrument Panel Wire and Center J/B (Behind the Instrument Panel Center)
3H
3I31
3J
3K
4C
4D334G33
4H
4JCowl Wire and Passenger Side J/B (Right Side of Grove Box)
4K
g(g )
4L32
4M
4N

2005 HIGHLANDER (EWD592U)
321
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CodeSee PageJoining Wire Harness and Wire Harness (Connector Location)
IB152Front Door LH Wire and Cowl Wire (Left Kick Panel)
IE152Roof Wire and Cowl Wire (Near the Bottom of Left Front Pillar)
IG152Instrument Panel Wire and Cowl Wire (Upper Portion of Right Instrument Panel Brace)
IH154Cowl Wire and A/C Sub No.2 Wire (Upper Portion of Right Instrument Panel Brace)
II154Instrument Panel Wire and A/C Sub No.1 Wire (Upper Portion of Right Instrument Panel Brace)
IK354Engine Room Main Wire and Cowl Wire (Right Cowl Side Panel)
IL154Instrument Panel Wire and Cowl Wire (Upper Side of Passenger Side J/B)
IM154Engine Wire and Cowl Wire (Right Kick Panel)
IN154Front Door RH Wire and Cowl Wire (Right Kick Panel)
IR254Instrument Panel Wire and Floor Wire (Under the Shift Lever)
BB156Rear Door No.1 LH Wire and Floor No.2 Wire (Left Center Pillar)
BC156Rear Door No.1 RH Wire and Floor Wire (Right Center Pillar)
BG156Back Door No.1 Wire and Floor No.2 Wire (Rear Left of the Roof)
BH156Floor No.2 Wire and Floor Wire (Near the Rear Side Marker Light RH)
BJ156Floor Wire and Floor No.4 Wire (Right Side of Rear Floor Crossmember)
BL158Floor Wire and Front Seat RH Wire (Under the Front Passenger's Seat)BM158Floor Wire and Front Seat RH Wire (Under the Front Passenger's Seat)
: GROUND POINTS
CodeSee PageGround Points Location
EA48 (3MZ-FE)EA50 (2AZ-FE)Right Front Fender Apron
EB48 (3MZ-FE)Right Front Fender Apron
EB50 (2AZ-FE)
EC48 (3MZ-FE)Left Side of Cylinder Head
ED48 (3MZ-FE)Rear Side of Cylinder Head
EE50 (2AZ-FE)Intake Side of Cylinder Block
EF50 (2AZ-FE)Left Side of Cylinder Block
EG48 (3MZ-FE)EG50 (2AZ-FE)Under the Left Headlight
EH48 (3MZ-FE)Under the Left Headlight
EH50 (2AZ-FE)
IA52Left Cowl Side Panel
IB52Right Instrument Panel Brace
IC52Right Cowl Side Panel
BA56Left Center Pillar
BB56Right Center Pillar
BC56Left Side of Rear Cross Member
BE56Left Side of Back Door
BF56Near the Rear Side Marker Light RH
: SPLICE POINTS
CodeSee PageWire Harness with Splice PointsCodeSee PageWire Harness with Splice Points
E648 (3MZ-FE)Engine WireI654Engine Wire
E950 (2AZ-FE)Engine WireB156Roof Wire
E1148 (3MZ-FE)B256Front Door LH WireE1150 (2AZ-FE)Engine Room Main WireB456Front Door RH Wire
E1248 (3MZ-FE)Engine Room Main WireB956Floor No.2 WireE1250 (2AZ-FE)

INTRODUCTIONIN-15
HANDLING PRECAUTIONS ON RELATED COMPONENTS
1. BRAKE SYSTEM
The brake system is one of the most important safety components. Always follow the directions and
notes given in brake (32) section of the repair manual for the relevant model when handling brake system
parts.
NOTICE: When repairing the brake master cylinder or TRAC system, bleed the air out of the TRAC sys-
tem.
2. DRIVE TRAIN AND CHASSIS
The drive train and chassis are components that can have great effects on the running performance and
vibration resistance of the vehicle. After installing components in the sections listed in the table below,
perform alignments to ensure correct mounting angles and dimensions. Particularly accurate repair of
the body must also be done to ensure correct alignment.
HINT: Correct procedures and special tools are required for alignment. Always follow the directions giv-
en in the repair manual for the relevant model during alignment and section DI of this section.
Component to be alignedSection of repair manual
for relevant model
Front WheelsFront Suspension (26) section
Rear WheelsRear Suspension (27) section
Propeller ShaftPropeller Shaft (30) section
3. COMPONENTS ADJACENT TO THE BODY PANELS
Various types of component parts are mounted directly on or adjacently to the body panels. Strictly ob-
serve the following precautions to prevent damaging these components and the body panels during han-
dling.

Before repairing the body panels, remove their components or apply protective covers over the com-
ponents.

Before prying components off using a screwdriver or a scraper, etc., attach protective tape to the tool
tip or blade to prevent damaging the components and the body paint.

Before removing components from the outer surface of the body, attach protective tape to the body to
ensure no damage to painted areas.
HINT: Apply touch-up paint to any damaged paint surfaces.

Before drilling or cutting sections, make sure that there are no wires, etc. on the reverse side.
4. ECU (ELECTRONIC CONTROL UNIT)
Many ECUs are mounted in this vehicle.
Take the following precautions during body repair to prevent damage to the ECUs.

Before starting electric welding operations, disconnect the negative (-) terminal cable from the bat-
tery.
When the negative (-) terminal cable is disconnected from the battery, memory of the clock and audio
systems will be cancelled. So before starting work, make a record of the contents memorized by each
memory system. Then when work is finished, reset the clock and audio systems as before.
When the vehicle has tilt and telescopic steering, power seat and outside rear view mirror, which are
all equipped with memory function, it is not possible to make a record of the memory contents.
So when the operation is finished, it will be necessary to explain this fact to the customer, and request
the customer to adjust the features and reset the memory.

Do not expose the ECUs to ambient temperatures above 80C (176F).
NOTICE: If it is possible the ambient temperature may reach 80C (176F) or more, remove the ECUs
from the vehicle before starting work.

Be careful not to drop the ECUs and not to apply physical shocks to them.

2005 HIGHLANDER (EWD592U)
3
HOW TO USE THIS MANUAL B
This manual provides information on the electrical circuits installed on vehicles by
dividing them into a circuit for each system.
The actual wiring of each system circuit is shown from the point where the power
source is received from the battery as far as each ground point. (All circuit
diagrams are shown with the switches in the OFF position.)
When troubleshooting any problem, first understand the operation of the circuit
where the problem was detected (see System Circuit section), the power source
supplying power to that circuit (see Power Source section), and the ground points
(see Ground Point section). See the System Outline to understand the circuit
operation.
When the circuit operation is understood, begin troubleshooting of the problem
circuit to isolate the cause. Use Relay Location and Electrical Wiring Routing
sections to find each part, junction block and wiring harness connectors, wiring
harness and wiring harness connectors, splice points, and ground points of each
system circuit. Internal wiring for each junction block is also provided for better
understanding of connection within a junction block.
Wiring related to each system is indicated in each system circuit by arrows
(from__, to__). When overall connections are required, see the Overall Electrical
Wiring Diagram at the end of this manual.