TOYOTA HIGHLANDER 2001 Service Repair Manual

I40178I39179I40555
Navigation ECU:
Stereo Component Amplifier Assy:N3
AUI+
AUI-
S23
FL+
FL-
I40178
N3
AUI+
AUI-AUO+
AUO-
05-1668
- DIAGNOSTICSAUDIO SYSTEM
1858 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
8 CHECK HARNESS AND CONNECTOR(NAVIGATION ECU - STEREO COMPONENT
AMPLIFIER ASSY)
(a) Disconnect the connectors from the navigation ECU and
stereo component amplifier assy.
(b) Measure the resistance according to the values in the
table below.
Standard:
Tester connectionConditionSpecified condition
AUI+ - FL+AlwaysBelow 1 W
AUI- - FL-AlwaysBelow 1 W
AUI+ - Body groundAlways10 kW or higher
AUI- - Body groundAlways10 kW or higher
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
9 INSPECT NAVIGATION ECU
(a) Disconnect the connector from the navigation ECU.
(b) Measure the resistance according to the values in the
table below.
Standard:
Tester connectionConditionSpecified condition
AUI+ - AUO+AlwaysBelow 1 W
AUI- - AUO-AlwaysBelow 1 W
NG REPLACE NAVIGATION ECU
(SEE PAGE 67-9)
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
(SEE PAGE 05-1632)

I39188
Multi-Display
Center J/B Instrument Panel J/B
Engine Room R/B
Instrument Panel J/B I15
IGNITION SW
F7
FL Block
Center J/BIG
ACC
+B1
GND1
Battery FL MAINALTRAD No.2ECU-IG
W-B W-B
IB W
WB IG1 AM1 ACC
WAM1 CRT
VVJ17
J/C
VVBRO
V R
M3 10
M311
M3 12 3E3 3G7
3A 13 3A1
1K3 1K9
1C2 1C7
L G
IK2 16
A
AIL16
2
1 2 2
42 3
1C6
211A1
1
3 2
3F13
3I6
M33 05-1828
- DIAGNOSTICSNAVIGATION SYSTEM
2018 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
POWER SOURCE CIRCUIT (MULTI-DISPLA Y)
CIRCUIT DESCRIPTION
This circuit provides power to the multi-display.
WIRING DIAGRAM
05CEF-10

I38678
M3
GND1 IG
ACC
+B1
- DIAGNOSTICSNAVIGATION SYSTEM
05-1829
2019 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
1 INSPECT MULTI-DISPLA Y(+B1, ACC, IG, GND1)
(a) Disconnect the multi-display connector M3.
(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
+B1 - GND1Always10 to 14 V
ACC - GND1Ignition SW ACC10 to 14 V
IG - GND1Ignition SW ON10 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)

I39195
Combination Meter Assy
Center J/BMulti-Display
SPD M325
W
3F6
3J9
W
C1213
- DIAGNOSTICSNAVIGATION SYSTEM
05-1841
2031 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
SPEED SIGNAL CIRCUIT (MULTI-DISPLA Y - COMBINATION
METER ASSY
CIRCUIT DESCRIPTION
The multi-display performs the switch operation control during running by receiving the vehicle speed signal
from the combination meter assy.
WIRING DIAGRAM
05CEI-08

I38678
M3
Multi-Display:
SPD
I40181
Combination Meter Assy:
C12
13
05-1842
- DIAGNOSTICSNAVIGATION SYSTEM
2032 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
1 CHECK HARNESS AND CONNECTOR(COMBINATION METER ASSY -
MULTI-DISPLA Y)
(a) Disconnect the connector from the multi-display M3 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

I40187
C12
13
IG Voltage
9 to 14 V
0
Turn the wheel Below 2 V
- DIAGNOSTICSNAVIGATION SYSTEM
05-1843
2033 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 MULTI-DISPLA Y(SEE PAGE 67-8)

I39192
Multi-display AssyNavigation ECU
R N4 W2
M424
R
7
3
1
8
6
2827 23 26 25
M4
M4
M4
M4
M4N4
N4
N4
N4
N4G
B
VR
SYNC
VG R
G
B
Y
Shielded G
B
VR
SYNC
VG 05-1852
- DIAGNOSTICSNAVIGATION SYSTEM
2042 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DISPLAY SIGNAL CIRCUIT (NAVIGATION ECU - MULTI-DISPLA Y)
CIRCUIT DESCRIPTION
This is the display signal circuit from the navigation ECU to the multi-display.
WIRING DIAGRAM
05IT4-02

I40183
Navigation ECU:
N4
BR
VR
VG
G SYNC
I38998R
M4 Multi-Display:
SYNC
G BVR VG
- DIAGNOSTICSNAVIGATION SYSTEM
05-1853
2043 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
1 CHECK HARNESS AND CONNECTOR(NAVIGATION ECU - MULTI-DISPLA Y)
(a) Disconnect the connector from the navigation ECU N4
and multi-display M4.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
R (N4) - R (M4)AlwaysBelow 1 W
G (N4) - G (M4)AlwaysBelow 1 W
B (N4) - B (M4)AlwaysBelow 1 W
SYNC (N4) - SYNC (M4)AlwaysBelow 1 W
VR (N4) - VR (M4)AlwaysBelow 1 W
VG (N4) - VG (M4)AlwaysBelow 1 W
R (N4 or M4) -
Body groundAlways10 kW or higher
G (N4 or M4) -
Body groundAlways10 kW or higher
B (N4 or M4) -
Body groundAlways10 kW or higher
SYNC (N4 or M4) -
Body groundAlways10 kW or higher
VR (N4 or M4) -
Body groundAlways10 kW or higher
VG (N4 or M4) -
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)

I39190
Multi-displayNavigation ECU
TX+
TX- BR SB
TX1+
TX1-
M35 M34
N45
N410 05-1860
- DIAGNOSTICSNAVIGATION SYSTEM
2050 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
AVC-LAN CIRCUIT (NAVIGATION ECU - MULTI-DISPLA Y)
CIRCUIT DESCRIPTION
Each unit of the navigation system connected to AVC-LAN (communication bus) communicates by transfer-
ring the signals from each switch.
When +B short and GND short occur in this AVC-LAN, navigation system will not function normally as com-
munication is discontinued.
In AVC-LAN, multi-display becomes the communication master, and the radio receiver assy has enough
resistance necessary for transmitting the communication.
WIRING DIAGRAM
05IT7-02

I40183
Navigation ECU:
TX+
TX-N4
I38678
Multi-Display:
TX1- TX1+M3
- DIAGNOSTICSNAVIGATION SYSTEM
05-1861
2051 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
1 CHECK HARNESS AND CONNECTOR(NAVIGATION ECU - MULTI-DISPLA Y)
(a) Disconnect the connector from the navigation ECU N4
and multi-display M3.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
TX1+ - TX+AlwaysBelow 1 W
TX1- - TX-AlwaysBelow 1 W
TX1+ -
Body groundAlways10 kW or higher
TX1- -
Body groundAlways10 kW or higher
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN DIAGNOSTIC TROUBLE CODE CHART
(SEE PAGE 05-1791)