Page 1969 of 2572
E50367
05-1676
- DIAGNOSTICSAUDIO SYSTEM
1866 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3 INSPECT RADIO RECEIVER ASSY(ANTENNA)
(a) Preparation for Check
(1) Remove the antenna plug of the radio receiver as-
sembly.
(b) Noise Check
(1) With the radio receiver assy connector connected,
turn the ignition switch to the ACC position.
(2) Turn on the radio and choose the AM mode.
(3) Place a flat-head screwdriver or a piece of metal
such as thin wire on an antenna jack of the radio re-
ceiver assy and check that the noise is heard from
the speaker.
OK: Noise occurs.
NG REPLACE RADIO RECEIVER ASSY
(SEE PAGE 67-6)
OK
4 CHECK ANTENNA TYPE
(a) Choose type to be inspected.
TypeGo to step
Glass printed type antennaA
Fender type antennaB
B Go to step 7
A
Page 1970 of 2572

BE4029
Tester Probe
Antenna WireTin Foil
E32576
- DIAGNOSTICSAUDIO SYSTEM
05-1677
1867 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
5 CHECK ANTENNA ASSY
(a) Check for continuity of the antenna.
HINT:
Inspect the continuity, at the center of each antenna wire, as
shown in the illustration.
NOTICE:
When cleaning the glass, use a soft dry cloth, and wipe the
glass in the direction of the wire. Take care not to damage
the wires. Do not use detergents or glass cleaners with
abrasive ingredients. When measuring voltage, wind a
piece of tin foil around the top of the negative probe and
press the foil against the wire with your finger, as shown in
the illustration.
OK: There is continuity in the antenna.
NG REPAIR ANTENNA ASSY (SEE PAGE 67-33)
OK
6 REPLACE AMPLIFIER ANTENNA ASSY (SEE PAGE 67-15 OR 67-16)
(a) Replace the amplifier antenna assy and check if it operates normally.
OK: The amplifier antenna assy operates normally.
OK NORMAL OPERATION
NG
REPLACE RADIO RECEIVER ASSY (SEE PAGE 67-6)
7 CHECK ANTENNA ASSY
(a) Check that the antenna is securely installed.
OK: The antenna is installed properly.
OK Go to step 6
NG
INSTALL THE ANTENNA ASSY PROPERLY
Page 1971 of 2572
I34951
R28
Television Display AssyMulti-display Controller
Sub-assy
R311
BK115
15VL
MUTEMUTE 05-1722
- DIAGNOSTICSREAR SEAT ENTERTAINMENT SYSTEM
1912 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
MUTE SIGNAL CIRCUIT (FROM TELEVISION DISPLAY ASSY)
CIRCUIT DESCRIPTION
The multi-display controller sub-assy controls the volume according to the MUTE signal from the television
display assy.
The MUTE signal is sent to reduce noise and a popping sound when modes, etc. are switched.
WIRING DIAGRAM
05CF3-02
Page 1972 of 2572

I37212
R28
Television Display Assy:
MUTE
I35962I34943
R31
MUTE
Multi-display Controller Sub-assy:
I37213
MUTER28
Television Display Assy:
- DIAGNOSTICSREAR SEAT ENTERTAINMENT SYSTEM
05-1723
1913 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
1 CHECK HARNESS AND CONNECTOR(TELEVISION DISPLAY ASSY -
MULTI-DISPLA Y CONTROLLER SUB-ASSY)
(a) Disconnect the connector from the television display assy
and multi-display controller sub-assy.
(b) Measure the resistance according to the values in the
table below.
Standard:
Tester connectionConditionSpecified condition
MUTE - MUTEAlwaysBelow 1 W
MUTE - Body groundAlways10 kW or higher
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
2 INSPECT TELEVISION DISPLAY ASSY
(a) Connect the television display assy connector.
(b) Measure the voltage according to the values in the table
below.
Standard:
Tester connectionConditionSpecified condition
MUTE - Body groundDVD system soundingApprox. 3.5 V
MUTE - Body groundDVD system changingBelow 1.0 V
NG REPLACE TELEVISION DISPLAY ASSY
(SEE PAGE 67-26)
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
(SEE PAGE 05-1704)
Page 1973 of 2572
I34952
R23R29 IP1
BR
SB
LG
PBW R G (Shielded) (Shielded)18
17
16
15
1427
23
24
25
26 15 16 17 1814
SLD1
RSL-
RSL+
RSR-
RSR+SG2
R-L-
R-L+
R-R-
R-R+ Radio Receiver AssyMulti-display Controller
Sub-assy
R23
R23
R23
R23R29
R29
R29
R29 IP1
IP1
IP1
IP1 05-1724
- DIAGNOSTICSREAR SEAT ENTERTAINMENT SYSTEM
1914 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
SOUND SIGNAL CIRCUIT (FROM RADIO RECEIVER ASSY)
CIRCUIT DESCRIPTION
This is the sound signal circuit from the radio receiver assy to the multi-display controller sub-assy.
WIRING DIAGRAM
05CF4-03
Page 1974 of 2572
I40203
Radio Receiver Assy:
R23
RSL-
RSL+
RSR-RSR+
SLD1
I34639
Multi-display Controller Sub-assy:
R29
R-L-
R-L+
R-R-
R-R+ SG2
- DIAGNOSTICSREAR SEAT ENTERTAINMENT SYSTEM
05-1725
1915 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
1 CHECK HARNESS AND CONNECTOR(RADIO RECEIVER ASSY - MULTI-DISPLA Y
CONTROLLER SUB-ASSY)
(a) Disconnect the connector from the radio receiver assy
and multi-display controller sub-assy.
(b) Measure the resistance according to the values in the
table below.
Standard:
Tester connectionConditionSpecified condition
SLD1 - SG2AlwaysBelow 1 W
RSL- - R-L-AlwaysBelow 1 W
RSL+ - R-L+AlwaysBelow 1 W
RSR- - R-R-AlwaysBelow 1 W
RSR+ - R-R+AlwaysBelow 1 W
RSL- - Body groundAlways10 kW or higher
RSL+ - Body groundAlways10 kW or higher
RSR- - Body groundAlways10 kW or higher
RSR+ - Body groundAlways10 kW or higher
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
Page 1975 of 2572
I40577
RSL-
RSL+RSR-RSR+
R23Radio Receiver Assy:
05-1726
- DIAGNOSTICSREAR SEAT ENTERTAINMENT SYSTEM
1916 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
2 INSPECT RADIO RECEIVER ASSY
(a) Connect the connector.
(b) Using an oscilloscope, check the signal waveform be-
tween the terminals according to the conditions, as
shown in the chart.
Standard:
Tester connectionConditionSpecified condition
RSL- - Body groundWhile voice sound is being producedA waveform synchronized with sound is output
RSL+ - Body groundWhile voice sound is being producedA waveform synchronized with sound is output
RSR- - Body groundWhile voice sound is being producedA waveform synchronized with sound is output
RSR+ - Body groundWhile voice sound is being producedA waveform synchronized with sound is output
NG REPLACE RADIO RECEIVER ASSY
(SEE PAGE 67-6)
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
(See page 05-1704)
Page 1976 of 2572
I34948
V13
Video (Video Adapter) Terminal
(Shielded)Multi-display Controller
Sub-assy
10
R30 SGND
AUXR
AUXL11 12
Y
BR
AUXL AUXR SG7
3
1
2R30
R30
- DIAGNOSTICSREAR SEAT ENTERTAINMENT SYSTEM
05-1727
1917 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
SOUND SIGNAL CIRCUIT (FROM VIDEO (VIDEO ADAPTER)
TERMINAL)
CIRCUIT DESCRIPTION
This is the sound signal circuit from the video (video adapter) terminal to the multi-display controller sub-
assy.
WIRING DIAGRAM
05CF5-02