2001 TOYOTA HIGHLANDER warning light

Inspector 's
Name:
Customer 's Name
Date Vehicle
Brought InProduction DateVIN
Licence No.
Odometer Reading/ /
/ /
Date Problem First Occurred
Frequency Problem Occurs/ /
ContinuousIntermittent ( times a day)
TRAC does not operate. (Wheels spin when starting rapidly.)
DisplaysDoes not Display
DTC Check1st Time
2nd TimeNormal System Code
Trouble Code (Code )
Normal System CodeTrouble Code (Code )
Symptomskm
miles
Light Abnormal TRAC OFF Indicator
Light Abnormal SLIP Indicator
Remains ONDoes not Come On
Check Item
NormalTrouble Code (Code )
NormalTrouble Code (Code )
ABS Warning Light
Malfunction
Indicator Light TRAC & VSC Check Sheet
Remains ONDoes not Come On
VSC does not operate. (Wheels sideslip at the time of sharp turning.)
VSC Warning
Indicator Abnormal
Skid Control
Buzzer AbnormalDoes not SoundSounds
VSC/TRC OFF SW
SYSTEMFreeze Frame Data
SHIFT POSITION
YAW RATON
OFF
VSC/TRAC
P, NR
D
deg/s
VFAIL
23
4L
MAS CYL PRESS
THROTTLE
MAS PRESS GRADE
G (RIGHT&LEFT)
G (BACK&FORTH)
STEERING ANG
deg
deg
MPa/s
G
G 05-764
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
954 Author
: Date
:

05-780
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
970 Author
: Date
:
C1236/36
(05-788)Foreign matter is attached on the tip of the left front sensor

Right front and left front speed sensor

Each speed sensor

Sensor installation
C1238/38
(05-795)Foreign matter is attached on the tip of the right rear sensor

Right rear and left rear speed sensor

Each speed sensor

Sensor installation
C1239/39
(05-795)Foreign matter is attached on the tip of the left rear sensor

Right rear and left rear speed sensor

Each speed sensor

Sensor installation
C1241/41
(05-827)Low battery positive voltage

Battery

Charging system

Power source circuit
C1243/43*1
(05-824)Malfunction in deceleration sensor (constant output)
Yaw rate sensor (Deceleration sensor)

Yaw rate sensor circuit (Deceleration sensor circuit)
C1244/44
(05-824)Malfunction in deceleration sensor
Yaw rate sensor (Deceleration sensor)

Yaw rate sensor circuit (Deceleration sensor circuit)
C1245/45*1
(05-824)Malfunction in deceleration sensor
Yaw rate sensor (Deceleration sensor)

Yaw rate sensor circuit (Deceleration sensor circuit)
C1246/46*2
(05-830)Malfunction in master cylinder pressure sensor
Master cylinder pressure sensor

Master cylinder pressure sensor circuit
C1249/49
(05-832)Open circuit in stop light switch circuit

Stop lamp bulb

Stop lamp switch

Stop lamp switch circuit
C1251/51*1
(05-835)
ABS pump motor is locked
Open circuit in pump motor circuit
ABS & TRAC actuator

ABS & TRAC actuator circuit
C1267/67
(05-837)Open or short circuit of brake pedal load sensing switch circuit
Brake pedal load sensing switch

Brake pedal load sensing switch circuit
C1361/91
(05-804)Short circuit in ABS motor fail safe relay circuit

ABS No.2 fuse

ABS MTR relay

ABS MTR relay circuit

J/B No.2
C1381/97
(05-824)Malfunction in power supply voltage yaw/deceleration sensor
Yaw rate sensor

Yaw rate sensor power source circuit
U0121/94
(05-2090)Malfunction in CAN communication
Wire harness

Skid control ECU
U0124/95
(05-2090)Malfunction in CAN communication with deceleration sensor
Wire harness

Yaw rate sensor (Deceleration sensor)
*1, *2:
Even after the trouble areas are repaired, the ABS warning light will not go off unless the following operations
are performed.

*1:
(1) Drive the vehicle at 12 mph (20 km/h) for 30 seconds or more and check that the ABS warning
light goes off.
(2) Clear the DTC (see page 05-765).

*2:
(1) Keep the vehicle in a stationary condition for 5 seconds or more and depress the brake pedal
lightly 2 or 3 times.
(2) Drive the vehicle at a vehicle speed of 31 mph (50 km/h). Then depress the brake pedal strongly
for about 3 seconds.
(3) Repeat the above operation 3 times or more and check that the ABS warning light goes off.
(4) Clear the DTC (see page 05-765).

- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
05-781
971 Author
: Date
:
HINT:

In some cases, the hand-held tester cannot be used when ABS warning light remains on.
DTC chart of VSC:
DTC No.
(See Page)Detection ItemTrouble Area
C1201/51
(05-812)Malfunction in ECMEngine control system
C1203/53
(05-813)Malfunction in ECM communication circuit

TRC+ or TRC- circuit

ENG+ or ENG- circuit

ECM
C1210/36
(05-815)Zero point calibration of yaw rate sensor undone
Yaw rate sensor (Deceleration sensor)

Zero point calibration undone
C1223/43
(05-817)Malfunction in ABS control systemABS control system
C1224/44
(05-818)Open or short circuit in NEO signal circuit

NEO circuit

ECM

Skid control ECU
C1231/31
(05-821)Malfunction in steering angle sensor

Steering angle sensor

Steering angle sensor circuit

+B circuit

Can communication system
C1232/32
(05-824)Malfunction in deceleration sensor
Yaw rate / deceleration

Yaw rate / deceleration sensor circuit
C1234/34
(05-824)Malfunction in yaw rate sensor
Yaw rate / deceleration

Yaw rate / deceleration sensor circuit
C1336/39
(05-815)Zero point calibration of deceleration sensor undone
Yaw rate sensor (Deceleration sensor)

Zero point calibration not done
U0123/62
(05-2090)Malfunction in CAN communication with yaw rate sensor
Wire harness

Yaw rate sensor (Deceleration sensor)
U0126/63
(05-2090)Malfunction in CAN communication with angle position sensor
Wire harness

Steering angle sensor
HINT:
In some cases, the hand-held tester cannot be used when the VSC warning light remains on.
DTC of sensor check function:
Code No.DiagnosisTrouble Area
C1271/71Low output voltage of right front speed sensor

Right front speed sensor

Sensor installation

Sensor rotor
C1272/72Low output voltage of left front speed sensor

Left front speed sensor

Sensor installation

Sensor rotor
C1273/73Low output voltage of right rear speed sensor

Right rear speed sensor

Sensor installation

Sensor rotor
C1274/74Low output voltage of left rear speed sensor

Left rear speed sensor

Sensor installation

Sensor rotor
C1275/75Abnormal change in output voltage of right front speed sen-
sorRight front sensor rotor
C1276/76Abnormal change in output voltage of left front speed sen-
sorLeft front speed sensor rotor
C1277/77Abnormal change in output voltage of right rear speed sen-
sorRight rear sensor rotor
C1278/78Abnormal change in output voltage of left rear speed sensorLeft rear speed sensor rotor

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

[N]
[O]
[P]
[Q]
[R]
[S]
[T]
[U]
2005 HIGHLANDER (EWD592U)
6
B HOW TO USE THIS MANUAL
Current is applied at all times through the STOP fuse to TERMINAL 2 of the stop light SW.
When the ignition SW is turned on, current flows from the GAUGE fuse to TERMINAL 8 of the light failure sensor, and also flows
through the rear lights warning light to TERMINAL 4 of the light failure sensor.
Stop Light Disconnection Warning
When the ignition SW is turned on and the brake pedal is pressed (Stop light SW on), if the stop light circuit is open, the current
flowing from TERMINAL 7 of the light failure sensor to TERMINALS 1, 2 changes, so the light failure sensor detects the
disconnection and the warning circuit of the light failure sensor is activated.
As a result, the current flows from TERMINAL 4 of the light failure sensor to TERMINAL 11 to GROUND and turns the rear lights
warning light on. By pressing the brake pedal, the current flowing to TERMINAL 8 of the light failure sensor keeps the warning
circuit on and holds the warning light on until the ignition SW is turned off.
S6 Stop Light SW
2-1 : Closed with the brake pedal depressed
L4 Light Failure Sensor
1, 2, 7-Ground : Approx. 12 volts with the stop light SW on
4, 8-Ground : Approx. 12 volts with the ignition SW at ON position
11-Ground : Always continuity
: Parts Location
CodeSee PageCodeSee PageCodeSee Page
C734L436R737
H1736R637S635
: Relay Blocks
CodeSee PageRelay Blocks (Relay Block Location)
118R/B No.1 (Instrument Panel Brace LH)
: Junction Block and Wire Harness Connector
CodeSee PageJunction Block and Wire Harness (Connector Location)
IB20Instrument Panel Wire and Instrument Panel J/B (Lower Finish Panel)
3C22Instrument Panel Wire and J/B No.3 (Instrument Panel Brace LH)
: Connector Joining Wire Harness and Wire Harness
CodeSee PageJoining Wire Harness and Wire Harness (Connector Location)
IE142Floor Wire and Instrument Panel Wire (Left Kick Panel)
BV150Luggage Room Wire and Floor Wire (Luggage Room Left)
: Ground Points
CodeSee PageGround Points Location
BL50Under the Left Center Pillar
BO50Back Panel Center
: Splice Points
CodeSee PageWire Harness with Splice PointsCodeSee PageWire Harness with Splice Points
I544Cowl WireB1850Luggage Room Wire
System Outline
Service Hints

2005 HIGHLANDER (EWD592U)
8
B HOW TO USE THIS MANUAL
The ground points circuit diagram shows the connections from all major parts to the respective ground points. When
troubleshooting a faulty ground point, checking the system circuits which use a common ground may help you identify
the problem ground quickly. The relationship between ground points (
EA, IB and IC shown below) can also be
checked this way.
5
5
5
5
4
44
4
4 BA15IB18EA2
ID115
IC33 IA12 E 3
W-BW-B W-B W-B W-B
W-B
W-B
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
W-B W-B W-B
W-B
BR
W-B
BR BRW-BW-B W-B
W-B
W-B
W-B
W-B W-B W-B
W-B
W-B W-B
W-B
W-B
BR W-B
BR BR
BR W-B (4A-GZE)
W-B W-BI 2
I 2
B 5 I 5 I 5 I 5
B 5
B 5
B 5
I 5
I 5
I 3 I 3 E 3
E 3
E 3
E 2
E 4
E 5
E 4
E 5
E 6 E 4 E 4
B 4
EA I 4
B 4
B 4
I 4 I 8
IB IC 443E5
3E6 3G13 3F3 3D1 3B7W-B
W-B
W-B W-B W-B
W-B
W-B
W-B
W-B
W-B
W-B
W-B
W-B
W-B W-BI 6
I 6
I 2 3C7
10A A A A
A
A
Junction
Connector J 1
W-B
W-B
W-B W-B
BR W-B W-B
W-B
W-B W-B
W-B
I GROUND POINT
FAN MAIN Relay
FAN MAIN Relay
A/C Relay No.2
A/C Relay No.3
Radiator Fan Motor
Headlight Cleaner Relay
Headlight LH
Headlight RH
Front Fog Light LH
Brake Fluid Level SW Front Fog Light RH Front Turn Signal Light RH
Front Clearance Light RH
Front Turn Signal Light LH
Front Clearance Light LH
Door Lock Control SW
Door Courtesy SW RH
Door Lock Motor RH
Door Lock Control Relay
Blower Resistor
Idle-Up SW
A/C Amplifier
Radio and Player
HEATER Relay
Auto Antenna MotorA/C Control Assembly
Blower Motor
Blower SW
Parking Brake SW
Combination Meter
Combination SW
Cruise Control ECU
Remote Control Mirror SW
Turn Signal Flasher
Defogger SW
Unlock Warning SW
Power Window Master SW
Power Window Control
Relay
Door Courtesy SW LH
Door Lock Control SW
Door Lock Motor LH
Fuel Control SW
Woofer Speaker Amplifier
Combination Meter
Combination Meter
Fuel Sender Cigarette Lighter
O/D Main SW
Clock
Combination SW
*The system shown here is an EXAMPLE ONLY. It is different to the actual circuit shown in the SYSTEM CIRCUITS SECTION.

2005 HIGHLANDER (EWD592U)
9
B
The ºCurrent Flow Chartº section, describes which parts each power source (fuses, fusible links, and circuit breakers)
transmits current to. In the Power Source circuit diagram, the conditions when battery power is supplied to each system
are explained. Since all System Circuit diagrams start from the power source, the power source system must be fully
understood.
ACC
S 26
652
22
Battery30A AM2
StarterShort Pin
100A ALT Fusible Link Block
60A ABS10A ECU-B
7.5A DOME
15A EFI
10A HAZARD
20A RADIO NO.1
10A HORN
20A
10AFusePage
214
230
11 2
122 194
187
180
166
210 ABS
Cigarette Lighter
Combination Meter
Key Reminder and Seat Belt Warning
Light Auto Turn Off
Theft Deterrent and Door Lock ControlABS and Traction Control
Cruise Control
Electronically Controlled Transmission
Multiplex Communication System STOPSystem
DOMEHeadlight
Interior Light
3 EA2 1 EA1E 6
E 7
E 7
2
2
2
2 2
2 2
2 INJECTION Relay
STARTER Relay B
B
B B-O
1
1 2
23
4
3
4W-B W-B
B-W
B-W E 7
E 7B
BW1.25B FL MAIN
50A MAIN
7.5A AM2
15A HAZ-RADIO 2
22
2
2W
WEB1
EB17
6
W-RI 2 I 2 I 2
WW
W W W
1 1
1 140A DOOR LOCK CB
7.5A DOME 1W-L
R 1
1
2
431
1 1
1
111 G
G
W-R 15A TAIL
20A DEFOG
B-Y 84
32Ignition SW I 8
B-Y
11P-L Battery
15A RAD CIG2
TAIL
Relay
Power Source J POWER SOURCE (Current Flow Chart)
Engine Room R/B (See Page 20)
2
W W
B B B B B
W-R
WW W
G-WAM2
AM1 IG2
IG1W
W
The chart below shows the route by which current flows from the battery to each electrical source
(Fusible Link, Circuit Breaker, Fuse, etc.) and other parts.
*The system shown here is an EXAMPLE ONLY. It is different to the actual circuit shown in the SYSTEM CIRCUITS SECTION.

010QL-02
- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS01-25
25 Author
: Date
:
HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS
GENERAL INFORMATION
A large number of ECU controlled systems are used in the HIGHLANDER. In general, ECU controlled sys-
tems are considered to be very intricate, requiring a high level of technical knowledge to troubleshoot. How-
ever, most problem checking procedures only involve inspecting the ECU controlled system's circuits one
by one. An adequate understanding of the system and a basic knowledge of electricity is enough to perform
effective troubleshooting, accurate diagnoses and necessary repairs. Detailed information and trouble-
shooting procedures on major ECU controlled systems in this vehicle are outlined below:
SystemSee Page
1. SFI System (2AZ-FE)05-1
2. SFI System (3MZ-FE)05-362
3. Tire Pressure Warning System05-729
4. ABS with EBD & BA & TRAC & VSC System05-761
5. Electronic Controlled Automatic Transaxle [ECT] (U241E/U140F)05-876
6. Electronic Controlled Automatic Transaxle [ECT] (U151E/U151F)05-986
7. Air Conditioning System05-1 114
8. Supplement Restraint System05-1 194
9. Lighting System05-1526
10. Audio System05-161 1
11. Rear Seat Entertaiment System05-1690
12. Navigation System05-1749
13. Combination Meter05-1868
14. Power Window Control System05-1901
15. Power Door Lock Control System05-1934
16. Wireless Door Lock Control System05-1960
17. Sliding Roof System05-1974
18. Engine Immobiliser System05-1985
19. Theft Deterrent System05-2012
20. Multiplex Communication System05-2040
21. CAN Communication System05-2090
22. Cruise Control System05-2136
FOR USING OBD II SCAN TOOL OR HAND-HELD TESTER

Before using the scan tool or tester, the scan tool's instruction book or tester's operator manual should
be read thoroughly.

If the scan tool or tester cannot communicate with the ECU controlled systems when you have con-
nected the cable of the tester to the DLC3 with the ignition switch and tester turned ON, there is a prob-
lem on the vehicle side or tester side.
(1) If communication is normal when the tester is connected to another vehicle, inspect the diagnosis
data link line (Bus
line) or ECU power circuit of the vehicle.
(2) If communication is still impossible when the tester is connected to another vehicle, the problem
is probably in the tester itself. So perform the Self Test procedures outlined in the Tester Opera-
tor 's Manual.