TOYOTA HIGHLANDER 2001 Service Repair Manual

I39189
Navigation ECU
Center J/B Instrument Panel J/B
Passenger Side J/B
Instrument Panel J/B I15
IGNITION SW
F7
FL Block
Engine Room J/B
Center J/BACC
+B
GND1
IB
Battery FL MAINALT
D.C.C
DOME ACC AM1AM1 RAD No.2
W-B W-BV
W WBW LV V LGW GR V
N317
3I2
3F132A3
2I1 2
1321C6
211A1IK312
4H6
4D 11
IL211 1C2
1K3
3F9 3A13
3I7 3I 10
N39 N3 18
3 05-1830
- DIAGNOSTICSNAVIGATION SYSTEM
2020 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
POWER SOURCE CIRCUIT (NAVIGATION ECU)
CIRCUIT DESCRIPTION
This circuit provides power to the navigation ECU.
WIRING DIAGRAM
05CEG-08

I40178
N3
+B
ACC
GND1
- DIAGNOSTICSNAVIGATION SYSTEM
05-1831
2021 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
1 INSPECT NAVIGATION ECU(+B, ACC, GND1)
(a) Disconnect the navigation ECU connector N3.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
GND1 - Body groundAlwaysBelow 1 W
(c) Measure the voltage according to the value(s) in the table
below.
Standard:
Tester connectionConditionSpecified condition
+B - GND1Always10 to 14 V
ACC - GND1Ignition SW ACC10 to 14 V
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE OR
DIAGNOSTIC TROUBLE CODE CHART (SEE PAGE 05-1778 OR 05-1791)

I39199
Multi-display Controller Sub-assy Radio Receiver Assy
TX1+
TX1- TX+
TX-
R2930 R2931
GRLG
IP1 19IP19
L Y
R2310 R239
(*1) (*1)
(*1) (*1)
*1: w/ Rear Seat Entertainment System 05-1688
- DIAGNOSTICSAUDIO SYSTEM
1878 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
AVC-LAN CIRCUIT (MULTI-DISPLA Y CONTROLLER SUB-ASSY -
RADIO RECEIVER ASSY
CIRCUIT DESCRIPTION
Each unit of the radio receiver system connected to AVC-LAN (communication bus) communicates by trans-
ferring the signals from each switch.
When +B short and GND short occur in this AVC-LAN, radio receiver system will not function normally as
communication is discontinued.
In AVC-LAN, radio receiver assy becomes the communication master, and the radio receiver assy has
enough resistance necessary for transmitting the communication.
WIRING DIAGRAM
05IRU-02

I40222
TX1+ TX1-
R23
I34639
Multi-display Controller Sub-assy:
R29
TX+TX-
I40203
Radio Receive Assy:
R23
TX1+
TX1-
- DIAGNOSTICSAUDIO SYSTEM
05-1689
1879 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
1 INSPECT RADIO RECEIVER ASSY
(a) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
TX1+ - TX1-Always60 to 80 W
NG REPLACE RADIO RECEIVER ASSY
(SEE PAGE 67-6)
OK
2 CHECK HARNESS AND CONNECTOR(MULTI-DISPLA Y CONTROLLER
SUB-ASSY - RADIO RECEIVER ASSY)
(a) Disconnect the connectors from the multi-display control-
ler sub-assy R29 and radio receiver assy R23.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
TX+ - TX1+AlwaysBelow 1 W
TX- - TX1-AlwaysBelow 1 W
TX+ - Body groundAlways10 kW or higher
TX- - Body groundAlways10 kW or higher
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
(SEE PAGE 05-1632)

05-1854
- DIAGNOSTICSNAVIGATION SYSTEM
2044 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DIMMER SIGNAL CIRCUIT
CIRCUIT DESCRIPTION
When the light control switch is in the TAIL or HEAD position, the TAILLIGHT relay activates and supplies
power to illuminate the multi-display panel.
05IT5-02

I40219
Multi-display Assy Center J/B C11
Combination Meter
Taillight System
F7
FL BlockILL-
ILL+ 3F5
3F9
3F13 3F3
3D3
3E 10
3A12
3I4
1 6
37
11
1222B
G
ORV
W
1A
1J 1K2A 2I4D 4HPassenger Side J/B
Engine Room J/B
Instrument Panel J/B
BB2
1 12
11
7
3
5
211LGM3
M3
IL2 IK3W-B
W-B
2
3 1
WALTDOME D.C.C
TAILLIGHT Relay PANEL
FL MAIN
Battery
IB V
4V
- DIAGNOSTICSNAVIGATION SYSTEM
05-1855
2045 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
WIRING DIAGRAM

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

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)

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

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