TOYOTA HIGHLANDER 2001 Service Repair Manual

Detection Item
Indicates the system or details of the
problem.Trouble Area
Indicates the suspect areas of
the problem.
Detection Item DTC No.
(See page)Trouble AreaSRS

Steering wheel pad (squib)

Spiral cable

Airbag sensor assembly

Wire harness
B0103/12
(05-132) B0102/11
(05-128)
DIAGNOSTIC TROUBLE CODE CHART
If a malfunction code is displayed during the DTC check, check the circuit for that code listed in the table
below (Proceed to the page given for that circuit).

Short in D squib circuit

Open in D squib circuit
B0101/14
(05-124)

Short in D squib circuit (to ground)

Short in D squib circuit (to B+)
Warning Light
ON
ON
ON
ON
Steering wheel pad (squib)

Spiral cable

Airbag sensor assembly

Wire harness

Steering wheel pad (squib)

Spiral cable

Airbag sensor assembly

Wire harness

Steering wheel pad (squib)

Spiral cable

Airbag sensor assembly

Wire harness
B0105/53
(05-136)ON

Airbag sensor assembly

Wire harness B0106/54
Open in P squib circuit

Airbag sensor assembly

Wire harness
Short in P squib circuit (to Ground)ON
ON B0100/13
(05-1 19)

Short in P squib circuit
Front passenger airbag assembly (squib)

Airbag sensor assembly

Wire harness

Front passenger airbag assembly (squib)

Front passenger airbag assembly (squib)
Page or Instructions
Indicates the page where the inspection proce-
dures for each circuit is to be found, or gives
instructions for checking and repairs.
DTC No.
Indicates the diagnostic trouble code.



- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS01-33
33 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DIAGNOSTIC TROUBLE CODE CHART
Use Diagnostic Trouble Codes (DTCs) (from the DTC checks) in the table below to determine the trouble
area and proper inspection procedure. The Supplemental Restraint System (SRS) diagnostic trouble code
chart is shown below as an example.

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

SFI
SFISFI
SFISFI
SFISFI
SFI
D25842

Circuit Description
The major role, operation of the circuit and its
component parts are explained.

Diagnostic Trouble Code No. and Detection Item

Indicates the diagnostic trouble codes, diagnostic
trouble code settings and suspect areas for a
problem.
Wiring Diagram
This shows a wiring diagram of the circuit.
Use this diagram together with ELECTRICAL
WIRING DIAGRAM to thoroughly understand the
circuit.
Wire colors are indicated by an alphabetical code.
B = Black, L = Blue, R = Red, BR = Brown,
LG = Light Green, V = Violet, G = Green,
O = Orange, W = White, GR = Gray, P = Pink,
Y = Yellow, SB = Sky Blue
The first letter indicates the basic wire color and
the second letter indicates the color of the stripe.
Inspection Procedures
Use the inspection procedures to determine
if the circuit is normal or abnormal. If it is ab-
normal, use it to determine whether the prob-
lem is located in the sensors, actuators, wire
harness or ECU.

Indicates the condition of the connector of the ECU
during the check.


Connections of tester are
indicated by (+), (-) after
terminals name.
Connector being checked
is connected.Connector being checked
is disconnected.
For inspection of connector
with body ground, there is
nothing about the body
ground written down.
- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS01-35
35 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
CIRCUIT INSPECTION
How to read and use each page is shown below.

ii
Important information about this manual
For safety reasons, this manual indicates
items requiring particular attention with the
following marks.
CAUTION
This is a warning against anything
which may cause injury to people if the
warning is ignored. You are informed
about what you must or must not do in
order to reduce the risk of injury to
yourself and others.
NOTICE
This is a warning against anything
which may cause damage to the ve-
hicle or its equipment if the warning is
ignored. You are informed about what
you must or must not do in order to
avoid or reduce the risk of damage to
your vehicle and its equipment.
INFORMATION
This provides additional information.
Initial screen
When you start the engine or turn the ignition
switch to the ACCº position, the initial
screen appears and the system begins
operating.
CAUTION
When the vehicle is stopped with the
engine running, always apply the park-
ing brake for safety.
After a few seconds, the CAUTIONº screen
appears.
Touch either Englishº or
Fran†aisº to select a language. Read
and follow the instructions.
When you touch the
I Agreeº switch
on the screen, the map screen appears.
You can access this screen when you push
the
INFOº button and touch the Lan-
guageº
switch. Then you can select a lan-
guage.

iii
Safety Instruction
To use your system in the safest possible
manner, follow all the safety tips shown be-
low.
This system is intended to assist you in
reaching your destination and, if used prop-
erly, can do so. You, as the driver, are solely
responsible for the safe operation of your ve-
hicle and the safety of your passengers.
Do not use any feature of this system to the
extent it distracts you from safe driving. Your
first priority while driving should always be
the safe operation of your vehicle. While you
are driving, be sure to observe all traffic regu-
lations.Prior to the actual use of this system, learn
how to use it and become thoroughly familiar
with it. Read the entire Navigation System
Owner's Manual to make sure you under-
stand the system. Do not allow others to use
this system until they have read and under-
stood the instructions in this manual.
For your safety, some functions may become
inoperable when you start driving. Unavail-
able switches are dimmed. You can input
your destination and select your route only
when the vehicle is not moving.
CAUTION

For safety, the driver should not
operate the navigation system while
he/she is driving. Inattention to the
road and traffic may cause an
accident.

While you are driving, be sure to
obey the traffic regulations and
maintain awareness of the road
conditions. If a traffic sign on the
road has been changed, route
guidance may provide wrong
information such as the direction of
a one way street.

iv While you are driving, listen to the voice in-
structions as much as possible and glance at
the screen briefly and only when it is safe.
However, do not totally rely on voice gui-
dance. Use it just for your information. If the
system cannot determine your current posi-
tion correctly, there is a possibility of incor-
rect, late or non-voice guidance.
The data in the system may occasionally be
incomplete. Road conditions, including driv-
ing restrictions (no left turns, street closures,
etc.) frequently change. Therefore, before
you follow any instruction from the system,
look to see whether you can comply with the
instruction safely and legally.
This system cannot warn you about such
things as the safety of an area, condition of
streets, and availability of emergency servi-
ces. If you are unsure about the safety of an
area, do not drive into it. Under no circum-
stances is this system a substitute for the
driver's personal judgement.
Use this system only in locations where it is
legal to do so. Some states/provinces may
have laws prohibiting video screens within
sight of the driver.

v

I40143
ECMCombination Meter Assy
TACH E55
BPassenger Side J/B
4F5
4L11
GR
IL221
O
C121
- DIAGNOSTICSCOMBINATION METER
05-1889
2079 Author
: Date
:
MALFUNCTION IN TACHOMETER
WIRING DIAGRAM
INSPECTION PROCEDURE
1 PERFORM ACTIVE TEST BY HAND-HELD TESTER
(a) Operate the hand-held tester according to the steps on the display and select the ºACTIVE TESTº.
METER:
ItemTest DetailsDiagnostic Note
TACHOMETER0rpm / 1000rpm / 2000rpm / 3000rpm / 4000rpm /
5000rpm / 6000rpm / 7000rpm-
OK:
Needle indication is normal.
NG REPLACE COMBINATION METER ASSY
(SEE PAGE 71-18)
OK
05IPZ-02

05-1890
- DIAGNOSTICSCOMBINATION METER
2080 Author
: Date
:
2 READ VALUE OF HAND-HELD TESTER(ENGINE SPEED SIGNAL)
(a) Operate the hand-held tester according to the steps on the display and select the ºDATA LISTº.
METER:
ItemMeasurement Item/
Range (Display)Normal ConditionDiagnostic Note
TACHO METEREngine speed / Min.: 50 rpm, Max.:
12,750 rpmAlmost same as actual engine
speed (When engine is running)-
OK:
Engine speed displayed on the tester is almost the same as the actual engine speed.
NG Go to step 3
OK
REPLACE COMBINATION METER ASSY(SEE PAGE 71-18)
3 READ VALUE OF HAND-HELD TESTER(ENGINE SPEED SIGNAL)
(a) Operate the hand-held tester according to the steps on the display and select the ºDATA LISTº.
ALL (ECM):
ItemMeasurement Item/
Range (Display)Normal ConditionDiagnostic Note
ENGINE SPDEngine speed / Min.: 50 rpm, Max.:
12,750 rpmAlmost same as actual engine
speed (When engine is running)-
OK:
Engine speed displayed on the tester is almost the same as the actual engine speed.
NG GO TO ENGINE CONTROL SYSTEM
(SEE PAGE 05-5, 05-362)
OK

I30440
Wire Harness View:
C12-1
A05138
- DIAGNOSTICSCOMBINATION METER
05-1891
2081 Author
: Date
:
4 INSPECT COMBINATION METER ASSY
INSPECTION USING OSCILLOSCOPE
(a) Check the input signal waveform.
(1) Remove the combination meter assy.
(2) Connect the oscilloscope to the terminals C12-1
and body ground.
(3) Start the engine.
(4) Check the signal waveform according to the condi-
tion (s) in the table below.
ItemCondition
Tool setting5 V/DIV, 10 ms/DIV
Vehicle conditionEngine idle speed
OK:
As shown in the illustration
NG Go to step 5
OK
REPLACE COMBINATION METER ASSY(SEE PAGE 71-18)