2001 TOYOTA HIGHLANDER relay

- INTRODUCTIONTERMS
01-47
47 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U) HO2S
Heated Oxygen SensorHeated Oxygen Sensor (HO2S)
IACIdle Air ControlIdle Speed Control (ISC)
IATIntake Air TemperatureIntake or Inlet Air Temperature
ICMIgnition Control Module-
IFIIndirect Fuel InjectionIndirect Injection (IDL)
IFSInertia Fuel-Shutoff-
ISCIdle Speed Control-
KSKnock SensorKnock Sensor
MAFMass AirflowAir Flow Meter
MAPManifold Absolute PressureManifold Pressure Intake Vacuum
MCMixture Control
Electric Bleed Air Control Valve (EBCV)
Mixture Control Valve (MCV)
Electric Air Control Valve (EACV)
MDPManifold Differential Pressure-
MFIMultiport Fuel InjectionElectronic Fuel Injection (EFI)
MILMalfunction Indicator LampCheck Engine Lamp
MSTManifold Surface Temperature-
MVZManifold Vacuum Zone-
NVRAMNon-V olatile Random Access Memory-
O2SOxygen SensorOxygen Sensor, O2 Sensor (O2S)
OBDOn-Board DiagnosticOn-Board Diagnostic System (OBD)
OCOxidation Catalytic ConverterOxidation Catalyst Convert (OC), CCo
OLOpen LoopOpen Loop
PAIRPulsed Secondary Air InjectionAir Suction (AS)
PCMPowertrain Control Module-
PNPPark/Neutral Position-
PROMProgrammable Read Only Memory-
PSPPower Steering Pressure-
PTOXPeriodic Trap OxidizerDiesel Particulate Filter (DPF)
Diesel Particulate Trap (DPT)
RAMRandom Access MemoryRandom Access Memory (RAM)
RMRelay Module-
ROMRead Only MemoryRead Only Memory (ROM)
RPMEngine SpeedEngine Speed
SCSuperchargerSupercharger
SCBSupercharger BypassE-ABV
SFISequential Multiport Fuel InjectionElectronic Fuel Injection (EFI), Sequential Injection
SPLSmoke Puff Limiter-
SRIService Reminder Indicator-
SRTSystem Readiness Test-
STScan Tool-
TBThrottle BodyThrottle Body
TBIThrottle Body Fuel InjectionSingle Point Injection
Central Fuel Injection (Ci)
TCTurbochargerTurbocharger
TCCTorque Converter ClutchTorque Converter

B71602
Vibrate Slightly
Shake Slightly
Vibrate
Slightly
D25084
Malfunction
- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS01-31
31 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
SYMPTOM SIMULATION
HINT:
The most difficult case in troubleshooting is when no problem symptoms occur. In such cases, a thorough
customer problem analysis must be carried out. A simulation of the same or similar conditions and environ-
ment in which the problem occurred in the customer's vehicle should be carried out. No matter how much
skill or experience a technician has, troubleshooting without confirming the problem symptoms will lead to
important repairs being overlooked and mistakes or delays.
For example:
With a problem that only occurs when the engine is cold or occurs as a result of vibration caused by the road
during driving, the problem can never be determined if the symptoms are being checked on a stationary ve-
hicle or a vehicle with a warmed-up engine.
Vibration, heat or water penetration (moisture) is difficult to reproduce. The symptom simulation tests below
are effective substitutes for the conditions and can be applied on a stationary vehicle.
Important points in the symptom simulation test:
In the symptom simulation test, the problem symptoms as well as the problem area or parts must be con-
firmed. First, narrow down the possible problem circuits according to the symptoms. Then, connect the tester
and carry out the symptom simulation test, judging whether the circuit being tested is defective or normal.
Also, confirm the problem symptoms at the same time. Refer to the problem symptoms table for each system
to narrow down the possible causes.
1. VIBRATION METHOD: When vibration seems to be
the major cause.
(a) PART AND SENSOR
(1) Apply slight vibration with a finger to the part of the
sensor considered to be the cause of the problem
and check whether or not the malfunction occurs.
HINT:
Applying strong vibration to relays may open relays.
(b) CONNECTORS
(1) Slightly shake the connector vertically and horizon-
tally.
(c) WIRE HARNESS
(1) Slightly shake the wire harness vertically and hori-
zontally.
The connector joint and fulcrum of the vibration are
the major areas that should be checked thoroughly.
2. HEAT METHOD: If the problem seems to occur when
the area in question is heated.
(a) Heat the component that is the possible cause of the mal-
function with a hair dryer or similar device. Check if the
malfunction occurs.
NOTICE:
Do not heat to more than 60C (140F). Exceeding this
temperature may damage components.
Do not apply heat directly to the parts in the ECU.

01-34- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
34 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
PROBLEM SYMPTOMS TABLE
The suspected circuits or parts for each problem symptom are shown in the table below. Use this table to
troubleshoot when, during a DTC check, a ºNormalº code is displayed but the problem is still occurring. Num-
bers in the table show the inspection order in which the circuits or parts should be checked.
HINT:
In some cases, the problem is not detected by the diagnostic system even though a problem symptom is
present. It is possible that the problem is occurring outside the detection range of the diagnostic system, or
that the problem is occurring in a completely different system.
Symptom
Suspected AreaSee Page
PROBLEM SYMPTOMS TABLE
05-1277
Problem SymptomPage
Indicates the page where the flow chart for each circuit
is located.
Circuit Inspection, Inspection Order
Indicates the circuit which needs to be checked for each problem
symptom. Check in the order indicated by the numbers.
Circuit or Part Name
Indicates the circuit or part which needs to be checked.
Inspect the ºFuseº and ºRelayº before confirming the suspected area in the charts below (See page 68-1).
1. SRS warning light circuit (multi-display assy)
1. Steering pad switch circuit
05-1267







HINT:
1. Power source circuit (multi-display assy)
Black screen
2. Multi-display 67-7
Screen cannot be dimmer in night time
2. Multi-display assy 67-7
A navigation system cannot be operated2. AVC-LAN circuit (radio receiver assy-multi-
display assy)
3. Radio receiver assy
4. Multi-display assy05-1 183
05-1303
67-5
67-7

2005 HIGHLANDER (EWD592U)
M OVERALL ELECTRICAL WIRING DIAGRAM
34
2 1
1 HIGHLANDER
2ACC
IG1
IG2
ST2 AM1 4
Engine Cont rol Module
<2- 8><3- 6><3- 7> 6
8 7AM2
W- R(
*1)
B
W1C 6
1A 1
10
Engine Cont rol
Module< 2- 7> < 3- 6>
140A ALT2
W- R W- R 2 1
3 5
22
1A
B1N P
41F 6
W- R 1C 4
EFLeft Side of
Cy linder Block 1IC3 1
W- R STARTER
Relay
42 42 42 42 42 42 13 13 13 13 13 13
BB
GR
B- WW L- Y
W- B W- B W- B W- B RRRRR(
*1)
WYORR R- L(
*1) R P R Y- BR L- Y R(
*1) G- Y(
*1) R(
*1) L- R(
*1)
W- B W- R W- B W- R W- B W- R W- B W- R W- B(
*1) W- G(
*1) W- B(
*1) W- R(
*1)
W- B
BRW- R W- R
Starting and Ignition Power Source
15A IG2
40A AM1
12
1
EC Left Side of
the Cylinder Head 2 2 2IC1 1IC1
30A AM2
2 2
7. 5 A ST ARTER
3W
4 EB13 EB2
L
Engine Contr ol
Module< 2- 6> < 3- 8>
FL MAIN
3. 0W W- RB- R
B- W
1
1C1
1G GR
* 1 : 3MZ- FE
* 2 : 2AZ- FE
W- B
(
*1) (
*2)
1
2
(
*1)
(
*1) G
Under the
Left HeadlightEH A ST1
3IC1 B 1BB-Y
P 1
5 4 EB2
B- R
L- W
B
Engine Control
Module<2- 6><3- 8>B- R
BB
B- WW- B
2EB1
BRW- R
R- W(
*2)
4A
4BA
B
C
(
Cont. next page)
W
W
G
I15
J 2 F 7
S 1(
A)
, S 2(
B)
S28(
A)
, S29(
B)
I 2 I 3 I 4 I 5 I 6 I 7
N 1
Fusible Link Block
Ignition Coil and
Igniter No. 1 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. 6
Ignition SW
Junc tion
Connec tor
Noise Filt er
(
Ignition System)
Park/Neutral
Position SW
Starter
Short Connector GND IGF GND IGF I GFGND GND IGF IGFGN D GN D I GF +B IGT +B IGT I GT+B +B I GT I GT+B +B I GT

2005 HIGHLANDER (EWD592U)
M OVERALL ELECTRICAL WIRING DIAGRAM
1
234
2 HIGHLANDER(
Cont. next page)
Engine Control (
3M Z- FE)
Power Source
YB- WW
EFI
RelayD
W IC1 4
RW
G
LGIC3 6
R
W
WW
1
2
2 2
B- W
R
R
R R
A
B
6 7
L Y B W
CIRCUIT OPENING
Relay
R- W
B- WGY B
W- B
P- L
W- B L
W
BR
Y
W
K
P- L
G
R- WB- W
W
B
Y
LR R R R R 1
2
Y
G
W
W
WL- Y
QP ON MLJ C
IK3 13
A
Under the Left
HeadlightEH 52B 52G
32D 82B 42F5
3 1
2
Lef t Side of
Rear Cross MemberBCM 4
51 11 1
5 1
23 4E 1
61G
A/ F Rel ay2 2 2
2 1
3 5
R R R
5EB1
2
1 2
1 2
1 2
1 2
1 2
1 91G 41C 11G 11C
12I
20A
EFI NO. 1
2 GR
2
IC1 1
3
1
30A AM2
140A ALT
2W
10
Bat tery FL MAIN
3. 0W4M 4
7. 5A OBD
1E 10
1A 1BW
22B 72
2 1 2F B- W
B- W
G
2IC2
B
2A 7
W- BW- BP- L
14FB P
P
2B 4E W 2ACC
IG1
ST1
IG2
ST2 AM1 4
AM2
10A ETCS25A A/ F 15A IG2 10A IGN 10A EFI NO. 2
W40A AM1
1C 6
G10A HEATER1C 7
1K 13 G
73C
43A
BH P
Cruise Malfunction
Indicator Lamp11 A 4 B1A 13A
10 IL2 3B 12
3K 2I SB 9IL1
IB Right Instrument
Panel Brace
BR SB
PRL
P W
P
1 2
8IA2
W
B B B- W B- W
W
I15
F 7
I 8 I 9
I10
I11
I12
I13 C1 1(
A)
, C12(
B)
J 2
F12 Combination Meter
Fusible Link Block
Fuel Pump
Injector No. 1 Injector No. 2
Injector No. 3
Injector No. 4 Injector No. 5 Injector No. 6
Ignition SW
Junction
Connector

2005 HIGHLANDER (EWD592U)
M
3
IK2 10
L- B
GRL- W
B- R
2
30 W
E
R
V
B- RD
5
IM1 5
R
1
BJ1 18B
5IO1
W- B
78
6 5
(
Cont. next page)
2 HIGHLANDER (
Cont' d)
E ngine C ontrol (
3MZ- FE)
29
STARTER Fuse
<1- 2>
Park/Neutral Posit ion SW
<1- 2>NS W STA
B B- R RSB
W- B
EB1
CCV
LE 27 1
2 B- W
B
Y
G
B- WP
R- W
W
B
Y
L A
B
D
G
VG
J
K E
L
M
N
O
P
QD 35E4EE32E1E 8A 10A20
THA 2A 1A
B- W
3AE E 16 E 17
W
Y
E2 G
G B- WWB YL2 1
2 1
2 1
6CE 15 34 E EB2 7B- W B- R B- R
BR- YG
33 D
W
A
B
C 21 6B
W+BM
W
RRL +B 2 +B B AT T
Air Conditioning Sys tem
<34- 8><35- 8>B 2
B- R
B- R
W- L2B- R
E R- W
GR
Y- GBR
8C
L- W
8E
R- L
9E
P10 E
Y- B11 E
L- Y12 E
G- Y13 E
L- R
I gnit ion Coil and I gniter s
<1- 3><1- 4> E
FAN NO. 2 Relay
<32- 3>
MREL FC #60 #50 #40 #30 #20 #10ACMG CF IGT1 IGT2 IGT3 IGT4 IGT5 IGT6 ACMACI S PRG HT2 B
Charging Sy stem
<1- 5>
11 IK21
29 D
BOX 2B3(
Shielded)
4 B- W CW W
C
IO1 16 F
BJ1 14
GR
1
B- W
STP
19 B
Electronically Controlled Transmission
and A/T I ndic ator Sys tem
<13- 2>
27 D 35 D 26 D 34 D
Elec tr onic ally
Controlled
Transmission and
A/T Indicator System
<13- 5>
NT- NT+ NC+ NC-
IGF1
Ignition Coil and Igniters
<1- 3> W- RE 24 GR
W
B- R B- R B- RGR
B- R B- W
9A
IGSW 12 B
ST 1-E E
HEE
P
2
1
Stop Light
System< 9- 1>SB
I11 AW4F BR
BR
P
PVP
4 3
14 IM1
W
V 5
S15 V1 4
J 3
H 6
V 4
V 2
M 1FAN NO. 1 Relay
<32- 3>
E 5(
A)
, E 6(
B)
, E 7(
E)
, E 8(
D)
, E 9(
C)
Engine Cont rol Module
Heated Ox ygen Sensor
(
Bank 2 Sensor 2)
Junction
Connector
Mass Air Flow Meter
Stop Light SW VSV (
ACIS No. 2) VSV (
EVAP)
VSV (
ACM) VSV
(
Canis ter Closed Valve)
E2 +B +B E1
VG E2G THA
HT OX

2005 HIGHLANDER (EWD592U)
M OVERALL ELECTRICAL WIRING DIAGRAM
1
234
3 HIGHLANDER(
Cont. next page)
FL MAIN
3. 0W
Bat tery10W2
140A ALT30A AM2
13
Engine Control (
2AZ- FE)
1IC110A
ET CS 2
22I 1
1C 1
1G 1
1C 4
15A
IG2
1G 910A
IGN
2 1
2 1
2 1
2 1 5 EB1
RRR
1G 63 2 151
11 4F 1
5 4
M
BC Left Side of
Rear Cross Member12 1
3 5
2F 42B82D3 2B 5
EH A 13 IK3A
B
C
K
L
M
N
O
L- Y
B W W
Y
1 2GR
RRR
L Y B
J W
Y BR L W- B W- B
EFI
Relay
P- L W- BWY
B
Y W
W
B- R
CIRCUIT OPENING
Relay
W
B
Y
L 76
B
8IA2
B
Power Source
R R W
R W
6IC3
LG
2B 7B- W
2IC2
B
42B
10A
EFI NO. 2
2
2 1 2E B- W
W
F
B- R
G
4M 4 14E
P
WP
D
EB11
B- W
7. 5A OBD
1E 10
1A 1W
EB13
B- W
2ACC
IG1
ST1
IG2
ST2 AM1 4
AM2
1C 7
10A HEATER
1K 13G
73C
3A 4 G
B 61C
40A AM1
W
W
H P
CRUI SE Malf unction
Indicator Lamp11 A 4 B1A 13A
10 IL2 3B 12
3K 2I SB 9IL1
IB Ri g ht I ns t r u me nt
Pa ne l Bra ce
BR SB
PRL
Under the Left
He ad li g ht
P
W 1 2
4IC1
20A
EFI NO. 1 W
F 7I15
I11
I10
I 9
I 8 C1 1(
A)
, C12(
B)
F12
J 2
Combinat ion Meter
Fusible Link Block
Fuel Pump
Inj ector No. 1 Inj ector No. 2 Inj ector No. 3 Inj ector No. 4
Ignition SW
J unc tion
Connec tor

2005 HIGHLANDER (EWD592U)
M
2
B- R
W WW
FW
1
78
6 5
(
Cont. next page)
3 HIGHLANDER (
Cont' d)
A
B
Y W
W
B- R
W
B
Y
L
E ngine C ontrol (
2AZ- FE)
A
B
C
J
K
L
M
N
O4E E32E1E 8A 10A10 IK2
1A 6BIK2 B- W
E
B- WBATT DP
W
ABR
3
Y
B WB YL
2 1
34 E 11B- R G
A
B
C
C 21RL +B +B2 +BM
Air Conditioning Sys tem
<34- 8><35- 8>B 2E 19W
B- R
B- R
W
24 E
W- R
8E
R- W
9E
P10 E
Y- B11 E
L- Y
Ignition Coil and Igniters
<1- 3><1- 4>
Ignition Coil and Igniters
<1- 3>
MREL FC #4 #3 #2 #1 ACMG IGF1 IGT1 IGT2 IGT3 IGT4PRG
Charging Sy stem
<1- 5>
B- R
B- R
G
R- LPSW
C 10
1
G
30 E
VG29 E
EVG20 E
THA 3 1
2
R
4 5L- WL- B
2 1
E 5
18 E 6 4
21 E 31 C 3 C 22
17 C 3E2 M- M+ VTA2 VAT1 VC
(
Shielded)
GE01
BR BR G- B
VC
WB B- R
VTA1B- WYY
VTA2 M+ M- THWBR G
E02 E0 1 MOPS
W- BElec tr onic ally Controlled
Trans mis sion and A/T
Indicator System< 14- 2>
W- B
Y- BE 6 E 7
Left Side of
Cylinder BlockEF C 22
1C
FAN NO. 3 Relay
<33- 2> R- WCF
19 8STP
B
L- WE 14FAN NO. 2 Relay
<33- 3>FAN
2 1 OC 1+
C 16 15 COC 1 -
G- R G- W
B- R B- R
27 E 4 A 21 A3IO1 4IO112 BJ1 13 BJ1 BJ1
5IO118 14 BJ1
IO1 16
13 I M17IO1BJ1 164
12 IM1 15 IO1BJ1 1728139
PPMP MPMP VPMP Y
L BRB
L BRR WY RV
Y
WL
LG
Y- G SB
BR
P
BR
Elec tronic ally Cont rolled
Transmis sion and A/T
Indicator System< 14- 4>D 10 B 17 B
Y
Combination Meter
< 31- 4>SPD 9IL2Y
14 I M1
SB
I11 A
SBW5A
5B
E 28
BRE2
ST ARTER F us e
<1- 2>NSWB- RE 16
Park/Neutral Position SW
<1- 2>STABE 17 BR P
H
9A
IGSW 12 B
ST1-E
E EE
2
1
Stop Light
System< 9- 1> PP VPP
3
4D
E W- B
GR
GR6
ME01
W- BC 4
W- B
O 1
P 2
C 2
C17 T1 3
E 2
E 5(
A)
, E 6(
B)
, E 7(
E)
, E 8(
D)
, E 9(
C)
S2 8(
A)
, S29(
B)
M 1
V 4
S1 5
J 6
FAN NO. 1 Relay
<33- 3>
C a ms h a f t T i mi n g
Control Valve
Charcoal Canister Assembly
Engine Coolant
Temp. Sens or
Engine Cont rol Module
Mass Air Flow MeterOil Pressure SW
Power St eer ing Oil
Pressure SW
St op Light SWShort Connect or
Throttle Control Motor
VSV (
EVAP)
Junct ion
Connect or
VG E2G THAEKR EKN EKL EKQ EKS EKP
+B E2EKM Throttle Pos ition Sens or