TOYOTA HIGHLANDER 2001 Service Repair Manual

I39169
C16
AU1
AU2
EAU
- DIAGNOSTICSAUDIO SYSTEM
05-1645
1835 Author
: Date
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
2 INSPECT STEERING PAD SWITCH LH(AU1,AU2,EAU)
(a) Disconnect the steering pad switch LH connector.
(b) Measure the resistance according to the values in the table below.
Standard:
Tester connectionConditionSpecified condition
AU1 - EAUDo not switch positionApprox. 100 kW
AU1 - EAUSEEK+ switch: pushApprox. 0 W
AU1 - EAUSEEK- switch: pushApprox. 0.3 kW
AU1 - EAUVOL+ switch: pushApprox. 1 kW
AU1 - EAUVOL- switch: pushApprox. 3.2 kW
AU2 - EAUDo not switch positionApprox. 100 kW
AU2 - EAUMODE switch: pushApprox. 0 W
NG REPLACE STEERING PAD SWITCH LH
(SEE PAGE 67-28)
OK

I40203
R23
SW1
SW2GMD
Radio Receiver Assy:
I36955I38235
Spiral Cable Side:
EAUAU2AU1
A
05-1646
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1836 Author
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3 CHECK HARNESS AND CONNECTOR(SPIRAL CABLE SUB-ASSY - RADIO
RECEIVER ASSY)
(a) Disconnect the connectors from the spiral cable sub-
assy and radio receiver assy R23.
(b) Measure the resistance according to the values in the
table below.
Standard:
Tester connectionSpecified condition
SW1 - AU1Below 1 W
SW2 - AU2Below 1 W
GMD - EAUBelow 1 W
SW1 - Body ground10 kW or higher
SW2 - Body ground10 kW or higher
GMD - Body ground10 kW or higher
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
REPLACE SPIRAL CABLE SUB-ASSY (SEE PAGE 60-26)

I36622
Stereo Component Amplifier AssyRadio Receiver Assy
MUTE12
BR5
IR2BR7
R4MUTE
S22
- DIAGNOSTICSAUDIO SYSTEM
05-1651
1841 Author
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
AMP MUTE SIGNAL CIRCUIT (FROM RADIO RECEIVER ASSY)
CIRCUIT DESCRIPTION
This circuit sends the signal to the stereo component amplifier to mute the noise. Because of that, the noise
produced by changing the sound source ceases.
In addition, this circuit is used to mute the sound when the navigation system performs voice guide.
If the vehicle is equipped with a navigation system, normal audio sound will cease, and only voice guidance
will be heard from the driver's side speaker when voice guides are given.
If there is an open in the circuit, noise can be heard from the speaker when changing the sound source.
If there is a short in the circuit, even though the stereo component amplifier assy is normal, no sound or only
extremely small sound can be produced.
WIRING DIAGRAM
05IRO-01

I39177MUTES22
I39175I39178I40341
Radio Receiver Assy:
Stereo Component Amplifier Assy:MUTER4
MUTE
S22
05-1652
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1842 Author
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
1 INSPECT STEREO COMPONENT AMPLIFIER ASSY
(a) Measure the voltage according to the value in the table
below.
Standard:
Tester connectionConditionSpecification
MUTE -Body ground
Turn ignition switch to
ACC, Audio system is
playing "Changing
Above 3.5 V " Below 1 V
NG Go to step 2
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
(SEE PAGE 05-1632)
2 CHECK HARNESS AND CONNECTOR(RADIO RECEIVER ASSY - STEREO
COMPONENT AMPLIFIER ASSY)
(a) Disconnect the connectors from the radio receiver assy
and stereo component amplifier 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

- DIAGNOSTICSAUDIO SYSTEM
05-1653
1843 Author
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3 REPLACE RADIO RECEIVER ASSY (SEE PAGE 67-6)
(a) Replace the radio receiver assy and check if it operates normally.
OK: The radio receiver assy operates normally
OK NORMAL OPERATION
NG
REPLACE STEREO COMPONENT AMPLIFIER ASSY (SEE PAGE 67-20)

- DIAGNOSTICSAUDIO SYSTEM
05-1657
1847 Author
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:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
SPEAKER CIRCUIT
CIRCUIT DESCRIPTION

When the vehicle has a built-in type amplifier, a sound signal is sent from the radio receiver assy to
the speakers via the ºstandard typeº circuit.

When the vehicle has a separate type amplifier, a sound signal from the radio receiver assy is amplified
by the stereo component amplifier and then transmitted to the speaker via the ºJBL typeº.
If there is a short in this circuit, the stereo component amplifier assy detects it and stops output to the speaker.
Thus sound can not be heard from the speaker even if there is no malfunction in the stereo component ampli-
fier assy or speaker.
JBL Type:
When a short in the speaker circuit is detected, all sound output is stopped.
05IRQ-01

I30205
Standard type:
Radio Receiver Assy
F10
Front No.1
Speaker Assy LH
F11
Front No.1
Speaker Assy RH
R9
Rear Speaker
Assy LH
R10
Rear Speaker
Assy RHFL+
FL-
FR+
FR-
RL+
RL-
RR+
RR- R3
R3
R2 R2 R2 R2 R3 R32
10
IF3 7
IB1
6
1 6 2 5 1 20
IF3
IL1
IL1
IR1
IR1
IR1
IR1 BH1 BH1IN1 IN1IB1
BB1
BC1
BC1 BB1 1
1
1
1 2
2
2
21
12
2
3 3
3 4
46
6
1011
10
10
20
1
11 7
10
105 5 T11
Front No.2 Speaker Assy LH
T12
Front No.2 Speaker Assy RHP P
P R
V G
V W
LG
Y LG Y
B
LR
L
WR
Y L
R-YY
YB
WR
L LG
W R 05-1658
- DIAGNOSTICSAUDIO SYSTEM
1848 Author
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:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
WIRING DIAGRAM

I39172
Stereo Component
Amplifier Assy JBL type:
T11 Front No.2 Speaker Assy LH
F10
Front No.1
Speaker Assy LH
T12 Front No.2 Speaker Assy RH
R4
Radio Receiver Assy
*1: w/o Navigation System F11
Front No.1
Speaker Assy RH
R9
Rear Speaker
Assy LH
R10
Rear Speaker
Assy RHFL+
FL-
FR+
FR-
RL+
RL-
RR+
RR-
F. L
F. R
R.L
R.R
MUTE2
9
1
12 14136 5 103 114 8 10
111 20
105 101 101 20 10
1056 76 7
5 12134 3
16 1 1
1
1
1
1 2
2
2 2 22
9
8
19
18
7
10(Shielded) (Shielded)
FL+
FR+
RL+
RR+
MUTE
SLDS23
S23
S22 S23 S23 S23 S23 S23 S23
S22 S22
S22 S22 IR2
IR2 IR2 IR2 IR2 IR2BC1 BC1 BH1 BH1IL1 IL1 IF3 IF3
IR1
BB1BB1IN1 IN1 IB1 IB1
IR1 IR1 IR1 R
W
B YPPGY
V
LG
L
R
W
R
WGR YLGL
GR RB
L YGLG GBR-Y (*1)
(*1)
BRGB
W
R
BRGB
W
R 3
3
44
- DIAGNOSTICSAUDIO SYSTEM
05-1659
1849 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)

I40177
Radio Receiver Assy:
R3
RL+
RR+ R2
RR-
RL-
FR- FR+
FL+
FL-
I38233
Wire Harness Side:
(Front No.1 Speaker Assy)
(Rear Speaker Assy)
F10
F11
R9
R10
I38999
Wire Harness Side:
(Front No.2 Speaker Assy)
T11
T12
05-1660
- DIAGNOSTICSAUDIO SYSTEM
1850 Author
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
1 CHECK TYPE
HINT:
If the radio receiver assy is JBL type, ºJBLº is indicated on its surface.
(a) Choose type to be inspected.
TypeGo to step
Standard typeA
JBL typeB
B Go to step 6
A
2 CHECK HARNESS AND CONNECTOR(RADIO RECEIVER ASSY - SPEAKER
ASSY)
(a) Disconnect the connectors from the radio receiver assy
and speakers.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionSpecified condition
FL+ - 1 (Front No.1 speaker assy LH)Below 1 W
FL- - 2 (Front No.1 speaker assy LH)Below 1 W
FR+ - 1 (Front No.1 speaker assy RH)Below 1 W
FR- - 2 (Front No.1 speaker assy RH)Below 1 W
FL+ - 1 (Front No.2 speaker assy LH)Below 1 W
FL- - 2 (Front No.2 speaker assy LH)Below 1 W
FR+ - 1 (Front No.2 speaker assy RH)Below 1 W
FR- - 2 (Front No.2 speaker assy RH)Below 1 W
RL+ - 1 (Rear speaker assy LH)Below 1 W
RL- - 2 (Rear speaker assy LH)Below 1 W
RR+ - 1 (Rear speaker assy RH)Below 1 W
RR- - 2 (Rear speaker assy RH)Below 1 W
FL+ - Body ground10 kW or higher
FL- - Body ground10 kW or higher
FR+ - Body ground10 kW or higher
FR- - Body ground10 kW or higher
RL+ - Body ground10 kW or higher
RL- - Body ground10 kW or higher
RR+ - Body ground10 kW or higher
RR- - Body ground10 kW or higher
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK

- DIAGNOSTICSAUDIO SYSTEM
05-1661
1851 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3 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: 4 W
NG REPLACE FRONT NO. 1 SPEAKER ASSY (SEE
PAGE 67-10)
OK
4 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
5 INSPECT REAR 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: 8 W
NG REPLACE REAR SPEAKER ASSY
(SEE PAGE 67-12)
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
(SEE PAGE 05-1632)