Page 1577 of 2572
I38678
M3
ILL+
05-1856
- DIAGNOSTICSNAVIGATION SYSTEM
2046 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
1 CHECK SYSTEM
(a) Turn the light control switch to the TAIL or HEAD position.
Check if the illumination of the switches such as on the radio receiver assy comes on.
OK: Illumination of the switches comes on.
NG GO TO COMBINATION METER SYSTEM
(SEE PAGE 05-1868)
OK
2 INSPECT MULTI-DISPLA Y(ILL+)
(a) Disconnect the connector from the multi-display.
(b) Measure the voltage according to the values in the table
below.
Standard:
Tester connectionConditionSpecified condition
ILL+ - Body groundLight control switch
TAIL or HEAD10 to 14 V
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
Page 1578 of 2572
I40182
C11
ILL
Combination Meter Assy:
I38678
M3
ILL-
Multi-Display:
- DIAGNOSTICSNAVIGATION SYSTEM
05-1857
2047 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3 CHECK HARNESS AND CONNECTOR(COMBINATION METER ASSY -
MULTI-DISPLA Y)
(a) Disconnect the connectors from the combination meter
assy and Multi-display.
(b) Measure the resistance according to the values in the
table below.
Standard:
Tester connectionConditionSpecified condition
ILL - ILL-AlwaysBelow 1 W
ILL - Body groundAlways10 kW or higher
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE
(SEE PAGE 05-1778)
Page 1579 of 2572
I39193
Navigation ECU T11
Front No.2 Speaker Assy LH
AUO+
AUO- F10
Front No.1
Speaker
Assy LH
N311 N32
G
IF310
P
IB17
P
1 3 R
1
2
W
42V
IB16
G
IF320
B
- DIAGNOSTICSNAVIGATION SYSTEM
05-1849
2039 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
SPEAKER CIRCUIT (NAVIGATION VOICE)
CIRCUIT DESCRIPTION
This circuit is used when the voice guidance in the navigation system is on.
WIRING DIAGRAM
05IT3-02
Page 1580 of 2572

I40178I38999I40553
Navigation ECU:
Wire Harness Side:
Front No.2 Speaker AssyN3
AUO+
AUO-
T11
05-1850
- DIAGNOSTICSNAVIGATION SYSTEM
2040 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
1 CHECK HARNESS AND CONNECTOR(FRONT NO. 2 SPEAKER ASSY -
NAVIGATION ECU)
(a) Disconnect the connectors from the navigation ECU and
speaker.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
AUO+ - T11-1AlwaysBelow 1 W
AUO- - T11-2AlwaysBelow 1 W
AUO+ - Body groundAlways10 kW or higher
AUO- - Body groundAlways10 kW or higher
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
2 INSPECT FRONT NO. 2 SPEAKER ASSY
(a) Check that malfunction disappears when another speaker in a good condition is installed.
OK: Malfunction disappears
HINT:
Connect all the connectors to the speakers.
When there is a possibility that either right or left front speaker is defective, inspect by interchanging
the right one and the left one.
OK REPLACE FRONT NO. 2 SPEAKER ASSY
(SEE PAGE 67-1 1)
NG
Page 1581 of 2572

I38999I38233I40554
Wire Harness Side:
Front No.2 Speaker Assy
Wier Harness Side:
Front No.1 Speaker AssyT11
F10
- DIAGNOSTICSNAVIGATION SYSTEM
05-1851
2041 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3 CHECK HARNESS AND CONNECTOR(FRONT NO. 2 SPEAKER ASSY - FRONT
NO. 1 SPEAKER ASSY)
(a) Disconnect the connectors from the front No.2 speaker
assy and front No.1 speaker assy.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
3 (No.2 speaker) -
1 (No.1 speaker)AlwaysBelow 1 W
4 (No.2 speaker) -
2 (No.1 speaker)AlwaysBelow 1 W
3 (No.2 speaker) -
Body groundAlways10 kW or higher
4 (No.2 speaker) -
Body groundAlways10 kW or higher
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
4 INSPECT FRONT NO. 1 SPEAKER ASSY
(a) Resistance check.
(1) Measure the resistance between the terminals of the speaker.
NOTICE:
The speaker should not be removed for checking.
Standard: Approximately 4 W
NG REPLACE FRONT NO. 1 SPEAKER ASSY
(SEE PAGE 67-10)
OK
REPLACE NAVIGATION ECU (SEE PAGE 67-9)
Page 1582 of 2572
I39191
Combination Meter Assy
Center J/BNavigation ECU
SPD
C1213
W
3J9
3K 12
O
N35 05-1838
- DIAGNOSTICSNAVIGATION SYSTEM
2028 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
SPEED SIGNAL CIRCUIT (NAVIGATION ECU - COMBINATION
METER ASSY)
CIRCUIT DESCRIPTION
The navigation ECU receives the vehicle speed signal and information about the GPS antenna, and then
adjusts the vehicle position.
WIRING DIAGRAM
05IT0-02
Page 1583 of 2572
I40178
Navigation ECU:
SPD
N3
I4018113
Combination Meter Assy:
C12
- DIAGNOSTICSNAVIGATION SYSTEM
05-1839
2029 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
1 CHECK HARNESS AND CONNECTOR(COMBINATION METER ASSY -
NAVIGATION ECU)
(a) Disconnect the connector from the navigation ECU N3
and combination meter assy C12.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
SPD - C12-13AlwaysBelow 1 W
SPD - Body groundAlways10 kW or higher
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
Page 1584 of 2572
I40187
C12
13
IG Voltage
(9 to 14 V)
0
Turn the wheel Below 2 V
05-1840
- DIAGNOSTICSNAVIGATION SYSTEM
2030 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
2 INSPECT COMBINATION METER ASSY
(a) Connect the combination meter assy connector C12.
(b) Measure voltage.
(1) Adjust the shift lever to the neutral position.
(2) Jack up either one of the front wheels.
(3) Turn ignition switch to the ON position.
(4) Measure the voltage between terminal C12-13 and
body ground of combination meter assy when the
front wheels are turned slowly.
OK: Voltage is pulsed as shown below.
NG GO TO COMBINATION METER SYSTEM
(SEE PAGE 05-1868)
OK
REPLACE NAVIGATION ECU (SEE PAGE 67-9)