Page 1505 of 2572

I40135
B4
Front Seat Inner Belt Assy (Driver Side)
Connector Front View:
E58133
B4
Front Seat Inner Belt Assy (Driver Side)
Wire Harness View:
- DIAGNOSTICSCOMBINATION METER
05-1899
2089 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
2 READ VALUE OF HAND-HELD TESTER(DRIVER SEAT BELT)
(a) Operate the hand-held tester according to the steps on the display and select the ºDATA LISTº.
SRS AIRBAG:
ItemMeasurement Item/
Range (Display)Normal ConditionDiagnostic Note
D SEAT BUCKLDriver seat belt buckle switch is
ON / OFFON: Seat belt is fastened
OFF: Seat belt is unfastened-
NG Go to step 3
OK
REPLACE COMBINATION METER ASSY(SEE PAGE 71-18)
3 INSPECT FRONT SEAT INNER BELT ASSY (DRIVER SIDE)
(a) Disconnect the connector from the front seat inner belt
assy (Driver Side).
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Terminal NoConditionSpecified condition
B4-2 - B4-5Seat belt is fastenedApprox. 330 W
B4-2 - B4-5Seat belt is unfastenedApprox. 1,330 W
NG REPLACE FRONT SEAT INNER BELT ASSY
(DRIVER SIDE)
OK
4 CHECK HARNESS AND CONNECTOR(FRONT SEAT INNER BELT ASSY - BODY
GROUND)(SEE PAGE 01-26)
(a) Disconnect the connector from the front seat inner belt
assy (Driver Side).
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester ConnectionConditionSpecified Condition
B4-5 - Body groundAlwaysBelow 1 W
NG Go to step 5
OK
END
Page 1506 of 2572
I39225
Front Seat Inner Belt Assy (Driver Side)
Wire Harness View:
B4
Airbag Sensor Assy Center
Wire Harness View:
A23
05-1900
- DIAGNOSTICSCOMBINATION METER
2090 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
5 CHECK HARNESS AND CONNECTOR(FRONT SEAT INNER BELT ASSY - AIRBAG
SENSOR ASSY CENTER)(SEE PAGE 01-26)
(a) Disconnect the B4, A23 connectors.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester ConnectionConditionSpecified Condition
B4-2 - A23-10AlwaysBelow 1 W
A23-10 - Body groundAlways10 kW or higher
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
END
Page 1507 of 2572
E74083
I15
Ignition SWInstrument Panel J/B
Center J/BBody ECU
F7
FL Block
FL MAIN
Battery2
1C
7
1C
6
1C6
1J
10
1K
1
1A8
3A
10
3A6
3C
5
3B17
B9
5
B9ACC
IG ACC
IG1 AM1IG1
AM1 RAD No.2
L
G
43
2
W
W
B
2 1B
BR W
GR
ALT1 2 05-1594
- DIAGNOSTICSLIGHTING SYSTEM
1784 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
IGNITION SWITCH CIRCUIT
CIRCUIT DESCRIPTION
This circuit detects the state of the ignition switch and sends it to the multiplex network body ECU.
WIRING DIAGRAM
05IQE-01
Page 1508 of 2572
E74263
Multiplex Network Body ECU
Connector Front View:
B9
B9-5B9-17
- DIAGNOSTICSLIGHTING SYSTEM
05-1595
1785 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
HINT:
Inspect if another system (engine, wiper and so on) is normal before performing this procedure.
1 CHECK HARNESS AND CONNECTOR(IGNITION SWITCH CIRCUIT)
(a) Disconnect the B9 connector from multiplex network body ECU.
(b) Measure the voltage according to the value(s) in the table below.
Standard:
Tester connectionConditionSpecified condition
B9-5 - Body groundIgnition switch is ON
Ignition switch is OFF10 to 14 V
Below 1 V
B9-17 - Body groundIgnition switch is ACC
Ignition switch is OFF10 to 14 V
Below 1 V
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR (IGNITION SWITCH - MULTIPLEX
NETWORK BODY ECU)
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
(SEE PAGE 05-1538)
Page 1509 of 2572
B65516
1
T5
Security Indicator
Lamp Assy11
13
3F W-B
IB2B
3BTheft Warning ECU Assy
2
IND 3C25 8
T4 R 3F
W-BCenter J/B
B51710
1
2
05-2024
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
2214 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INDICATOR LIGHT CIRCUIT
CIRCUIT DESCRIPTION
While the theft deterrent system is preparing to be set, this circuit lights up the indicator lamp. When the sys-
tem is set, it continuously turns the indicator lamp on for 0.75 seconds and then turns it off for 1.25 seconds,
thus the indicator lamp blinks.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 CHECK SECURITY INDICATOR LAMP ASSY (OPERATION)
(a) Disconnect the T5 indicator lamp connector.
(b) Check if the security indicator lamp comes on when bat-
tery voltage is applied to each terminal of the connector.
Standard:
Measuring ConditionSpecified Operation
Battery positive (+) - Terminal 2
Battery negative (-) - Terminal 1Indicator lamp comes on.
NG REPLACE SECURITY INDICATOR LAMP ASSY
OK
05ITK-02
Page 1510 of 2572
B77249
Wire Harness Side
T5
Security Indicator
Lamp Assy
T4
Theft Warning ECU Assy
B78292
Wire Harness Side
T5
Theft Deterrent
Indicator Lamp Assy
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
05-2025
2215 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
2 CHECK WIRE HARNESS
(THEFT WARNING ECU ASSY - SECURITY INDICATOR LAMP ASSY)
(a) Disconnect the T5 indicator lamp and T4 ECU connectors
(b) Measure the resistance between the wire harness side
connecters.
Standard:
Tester ConnectionSpecified Condition
T4-25 (IND) - T5-2Below 1 W
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
3 CHECK WIRE HARNESS (SECURITY INDICATOR LAMP ASSY - BODY GROUND)
(a) Disconnect the T5 indicator lamp connector
(b) Measure the resistance between the wire harness side
connector and body ground.
Standard:
Tester ConnectionSpecified Condition
T5-1 - Body groundBelow 1 W
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
CHECK AND REPLACE THEFT WARNING ECU ASSY
Page 1511 of 2572

05EYX-02
F46772
Tire Pressure
Warning Reset Switch
Tire Pressure
Warning Lamp
Lamp Output Pattern:
Receipt of the Initialization Signal
Keep pressing
the switch for 3 sec.
1 Sec.
Failure of Initialization
0.25 Sec.
0.25 Sec. ON
OFF ON
OFF
1 Sec. 3 Sec. 05-736
- DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
926 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INITIALIZATION
NOTICE:
This system requires initializing after changing tires or wheels, or after rotating the tires.
Be sure to adjust the tire air pressure to the specified value before initialization.
1. INITIALIZING THE TIRE PRESSURE WARNING SYS-
TEM
(a) Check and adjust the tire pressure to the specified value.
Specified Value
Front210 kpa (2.1 kgf/cm2, 30 psi)
Rear210 kpa (2.1 kgf/cm2, 30 psi)
(b) With the vehicle stopped, turn the ignition switch to the
ON position.
(c) Press and hold the tire pressure warning reset switch until
the tire pressure warning lamp blinks 3 times at 1 second
intervals.
HINT:
If the tire pressure warning lamp does not blink, perform the ini-
tialization again. (with the ignition switch off, perform the proce-
dure above starting at step 1-(b).)
(d) Drive the vehicle at 19 mph (30 km/h) or more, to com-
plete the initialization of the skid control ECU. (It takes
more than one hour.)
HINT:
If the tire pressure warning lamp blinks at 0.25 second intervals
while the vehicle is being driven, the initialization may have
failed. If so, perform the initialization again. (Turn the ignition
switch off and retry from step 1-(a).)
(e) After initialization is completed, the skid control ECU mon-
itors the tire pressure by using the wheel speed sensors.
(f) To verify the system has been initialized check the length
of time the tire pressure warning lamp is on after turning
the ignition switch to the ON position.
Not initialized: 4 sec.
Initialized: 3 sec.
Page 1512 of 2572

05BYH-15
F45104
F45105
Bypass Wire
F45106
05-2090
- DIAGNOSTICSCAN COMMUNICATION SYSTEM
2280 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
CAN COMMUNICATION SYSTEM
PRECAUTION
1. HANDLING PRECAUTIONS ON STEERING SYSTEM
(a) Care must be taken when replacing parts. Incorrect replacement could affect the performance of the
steering system and result in a driving hazard.
2. HANDLING PRECAUTIONS ON SRS AIRBAG SYSTEM
(a) The HIGHLANDER is equipped with a SRS (Supplemental Restraint System), such as the driver air-
bag and front passenger airbag. Failure to carry out service operation in the correct sequence could
cause the SRS to unexpectedly deploy during servicing, possibly leading to a serious accident. Before
servicing (including removal or installation of parts, inspection or replacement), be sure to read the pre-
cautionary notice for the Supplemental Restraint System (see page 60-1).
3. WIRE HARNESS REPAIR
(a) After repairing the wire bus line with solder, wrap the re-
paired part with vinyl tape.
NOTICE:
The CANL bus line and CANH bus line must be
installed together all the time.
When installing, make sure to twist them.
The difference in length of the CANL bus line and
CANH bus line should be within 100 mm (3.937 in.).
Untwisted parts around the connectors should be
within 80 mm (3.150 in.).
(b) Do not perform bypass wiring between the connectors.
NOTICE:
If you perform bypass wiring, the characteristic of the
twisted wire harness will be lost.
4. CONNECTOR HANDLING
(a) When inserting tester probes into a connector, insert them
from the back of the connector.