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05-1228
DIAGNOSTICS - AUDIO SYSTEM 05BPW-02
SOUND QUALITY IS BAD IN ALL MODES (VOLUME IS TOO LOW)
WIRING DIAGRAM
10 Speaker:
Stereo Component Amplifier Assy Radio Receiver Assy
(Shielded) 10
R7 GND
3 9
G
L+ S11 R7 L+
2 19
R
L- S11 R7 L-
5 8
R+ W
S11 R7 R+
4 18
B
R- S11 R7 R-
1 7
MUTE S11 GR-B R7 MUTE
W3
w/ Box Speaker Assy No.2
8 17
R-L R-L
WF2+ S10 IE1 WF+
1
19 18
W-L W-L
WF2- S10 IE1 WF-
3
9 8
L-Y L-Y
WF1+ S10 IE1 WF+
2
20 9
L-W L-W
WF1- S10 IE1 WF-
4
3
L-B
CTR+ S10
3
C6
Stereo Component Speaker Assy
12
L-R
CTR- S10
4
I35601
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1411
05-1229
DIAGNOSTICS - AUDIO SYSTEM
T8
Front No.2 Speaker Assy LH
6 2 3
P P B P
FL+ S10 IF2 IA2
1 3
F17 1
Front No.1 Speaker
Assy LH 2
17 6 4
V V Y V
FL- S10 IF2 IA2
2 4
T9
Front No.2 Speaker Assy RH
7 1 17
LG LG W LG
FR+ S10 IF2 IM1
1 3
F18 1
Front No.1 Speaker
Assy RH 2
18 5 18
L L R L
FR- S10 IF2 IM1
2 4
T11
w/ Box
J22
Speaker
2 J/C 10
W W W Assy No.1
SUR+ S10 IE1
A A 1 LH
17
W W
IH1
A 1 T12
w/ Box
Speaker
Assy No.1
18 RH
L L
IH1
C 2
11 11
L L L 2
SUR- S10 IE1
C C
J/C
4 2 19 3
B B B
RL+ S10 IF1 J11 J12
1
R29
6 20 4 Rear Speaker Assy LH
13 2
Y Y Y
RL- S10 IF1 J11 J12
J/C
5 1 26 9
R R R
RR+ S10 IF1 J35 J36
1 R30
14 27 10 Rear Speaker Assy RH
3 2
W W W
RR- S10 IF1 J35 J36
I35602
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1412
05-1230
DIAGNOSTICS - AUDIO SYSTEM
6 Speaker: T8
Front No.2 Speaker Assy LH Radio Receiver Assy
3 2 2
P B P P
IA2 IF2 R5 FL+
3 1
1 F17
Front No.1 Speaker
Assy LH
2 6
4 6
V Y V V
IA2 IF2 R5 FL-
4 2
T9
Front No.2 Speaker Assy RH
17 1 1
LG W LG LG
IM1 IF2 R5 FR+
3 1
1 F18
Front No.1 Speaker
2 Assy RH
18 5 5
L R L L
IM1 IF2 R5 FR-
4 2
J/C
3 19 2 2
B B B
J12 J11 IF1 R6 RL+
R29 1
Rear Speaker Assy LH 4 20 6 6
2 Y Y Y
J12 J11 IF1 R6 RL-
9 J/C 26 1 1
R R R
J36 J35 IF1 R6 RR+
R30 1
Rear Speaker Assy RH
10 27 3 3
2 W W W
J36 J35 IF1 R6 RR-
I35603
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1413
05-1231
DIAGNOSTICS - AUDIO SYSTEM
6 Speaker, w/o RSA, RSE system: T8
Front No.2 Speaker Assy LH Radio Receiver Assy
3 2
P B P
IA2 R2 FL+
3 1
1 F17
Front No.1 Speaker
Assy LH
2
4 6
V Y V
IA2 R2 FL-
4 2
T9
Front No.2 Speaker Assy RH
17 1
LG W LG
IM1 R2 FR+
3 1
1 F18
Front No.1 Speaker
2 Assy RH
18 5
L R L
IM1 R2 FR-
4 2
J/C
3 19 2
B B
J12 J11 R3 RL+
R29 1
Rear Speaker Assy LH 4 20 6
2 Y Y
J12 J11 R3 RL-
9 J/C 26 1
R R
J36 J35 R3 RR+
R30 1
Rear Speaker Assy RH
10 27 3
2 W W
J36 J35 R3 RR-
I35603 I36613
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1414
05-1232
DIAGNOSTICS - AUDIO SYSTEM
INSPECTION PROCEDURE
1 ADJUST SOUND QUALITY
(a) Adjust the sound quality.
(1) Operate the radio receiver assy to adjust the sound quality.
Standard: malfunction disappears.
OK BAD SOUND QUALITY
NG
2 COMPARE IT WITH ANOTHER CAR OF SAME MODEL
(a) Compare it with another vehicle of the same models.
(1) Compare with the vehicle of the same type which does not have a trouble to see if there is any
difference in the condition of trouble occurrence.
Standard: No difference found.
NG Go to step 3 (6 SPEAKER)
NG Go to step 4 (10 SPEAKER)
OK
SETTING
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1415
05-1233
DIAGNOSTICS - AUDIO SYSTEM
3 CHECK HARNESS AND CONNECTOR(RADIO RECEIVER ASSY - SPEAKER
ASSY)
(a) Disconnect the connectors from the radio receiver assy
and speakers.
RL+ RR+ FL+ FR+
(1) Check continuity between terminals at each condi-
tion, as shown in the chart.
Specified
Tester connection
condition
FL+ - 1 (Front No.1 speaker assy LH) Continuity
FL- - 2 (Front No.1 speaker assy LH) Continuity
FR+ - 1 (Front No.1 speaker assy RH) Continuity
FR- - 2 (Front No.1 speaker assy RH) Continuity
FL+ - 1 (Front No.2 speaker assy LH) Continuity
FL- - 2 (Front No.2 speaker assy LH) Continuity
FR+ - 1 (Front No.2 speaker assy RH) Continuity
RL- RR- FL- FR-
FR- - 2 (Front No.2 speaker assy RH) Continuity
Front No.1 Speaker Assy RL+ - 1 (Rear speaker assy LH) Continuity
Rear Speaker Assy
RL- - 2 (Rear speaker assy LH) Continuity
RR+ - 1 (Rear speaker assy RH) Continuity
RR- - 2 (Rear speaker assy RH) Continuity
(2) Check for a short between terminals at each condi-
tion, as shown in the chart.
Specified
Tester connection
condition
FL+ - Body ground No Continuity
Front No.2 Speaker Assy FL- - Body ground No Continuity
FR+ - Body ground No Continuity
FR- - Body ground No Continuity
RL+ - Body ground No Continuity
RL- - Body ground No Continuity
RR+ - Body ground No Continuity
RR- - Body ground No Continuity
I35604
OK Go to step 6
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (See page 01-37 )
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1416
05-1234
DIAGNOSTICS - AUDIO SYSTEM
4 CHECK HARNESS AND CONNECTOR(STEREO COMPONENT AMPLIFIER ASSY -
SPEAKER ASSY)
(a) Disconnect the connectors from the stereo component
FR+ FL+ RR+ RL+ amplifier assy and speaker.
WF2+ CTR+ (1) Check continuity between terminals at each condi-
tion, as shown in the chart.
WF1+
Specified
Tester connection
condition
FL+ - 1 (Front No.1 speaker assy LH) Continuity
FL- - 2 (Front No.1 speaker assy LH) Continuity
FR+ - 1 (Front No.1 speaker assy RH) Continuity
FR- - 2 (Front No.1 speaker assy RH) Continuity
WF1-
RL- FL+ - 1 (Front No.2 speaker assy LH) Continuity
WF2- FR- FL- RR- FL- - 2 (Front No.2 speaker assy LH) Continuity
FR+ - 1 (Front No.2 speaker assy RH) Continuity
Front No.1 Speaker Assy
FR- - 2 (Front No.2 speaker assy RH) Continuity
Rear Speaker Assy
RL+ - 1 (Rear speaker assy LH) Continuity
RL- - 2 (Rear speaker assy LH) Continuity
RR+ - 1 (Rear speaker assy RH) Continuity
RR- - 2 (Rear speaker assy RH) Continuity
RL+ - 1 (Rear speaker assy No. 2 LH) Continuity
RL- - 2 (Rear speaker assy No. 2 LH) Continuity
RR+ - 1 (Rear speaker assy No. 2 RH) Continuity
RR- - 2 (Rear speaker assy No. 2 RH) Continuity
w/ Box Speaker Assy No.1
WF2+ - 1 (w/ box speaker assy LH) Continuity
WF2- - 3 (w/ box speaker assy LH) Continuity
WF1+ - 2 (w/ box speaker assy RH) Continuity
WF1- - 4 (w/ box speaker assy RH) Continuity
CTR+ - 3 (Stereo component speaker assy front) Continuity
CTR- - 4 (Stereo component speaker assy front) Continuity
w/ Box Speaker Assy No.2 (2) Check for a short between terminals at each condi-
tion, as shown in the chart.
Specified
Tester connection
condition
FL+ - Body ground No Continuity
FL- - Body ground No Continuity
FR+ - Body ground No Continuity
Front No.2 Speaker Assy
FR- - Body ground No Continuity
Stereo Component Speaker Assy RL+ - Body ground No Continuity
RL- - Body ground No Continuity
RR+ - Body ground No Continuity
RR- - Body ground No Continuity
I35605 WF2+ - Body ground No Continuity
WF2- - Body ground No Continuity
WF1+ - Body ground No Continuity
WF1- - Body ground No Continuity
CTR+ - Body ground No Continuity
CTR- - Body ground No Continuity
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1417
05-1235
DIAGNOSTICS - AUDIO SYSTEM
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR (See page 01-37 )
OK
5 CHECK HARNESS AND CONNECTOR(RADIO RECEIVER ASSY - STEREO
COMPONENT AMPLIFIER ASSY)
Radio Receiver Assy:
(a) Disconnect the connectors from the radio receiver assy
L+ R+ MUTE TX+
and stereo component amplifier assy.
(1) Check continuity between terminals at each condi-
tion, as shown in the chart.
Standard:
Tester connection Specified condition
L+ - L+ Continuity
L- - L- Continuity
R+ - R+ Continuity
TX-
L- R- - R- Continuity
R- TX+ - TX+ Continuity
Stereo Component Amplifier Assy: TX- - TX- Continuity
TX+ R+ L+ MUTE MUTE - MUTE Continuity
(2) Check for a short between terminals at each condi-
tion, as shown in the chart.
Standard:
Tester connection Specified condition
L+ - Body ground No Continuity
TX- R- L- L- - Body ground No Continuity
I33897
R+ - Body ground No Continuity
R- - Body ground No Continuity
TX+ - Body ground No Continuity
TX- - Body ground No Continuity
MUTE - Body ground No Continuity
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR (See page 01-37 )
OK
6 INSPECT FRONT NO.1 SPEAKER ASSY
(a) Resistance check.
(1) Check the resistance between the terminals of the speaker.
NOTICE:
The speaker should not be removed for checking.
Standard: 4
NG REPLACE FRONT NO.1 SPEAKER ASSY
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1418
05-1236
DIAGNOSTICS - AUDIO SYSTEM
7 INSPECT FRONT NO.2 SPEAKER ASSY
(a) Check that malfunction disappear when a known good speaker is installed.
Standard: Malfunction disappear
HINT:
Connect the all connectors speakers.
NG REPLACE FRONT NO.2 SPEAKER ASSY
OK
8 INSPECT REAR SPEAKER ASSY
(a) Resistance check.
(1) Check the resistance between the terminals of the speaker.
NOTICE:
The speaker should not be removed for checking.
Standard:
6 speaker models: 6.0
10 speaker models: 2.4
NG REPLACE REAR SPEAKER ASSY
OK
9 INSPECT W/BOX SPEAKER ASSY NO.1(W/ 10 SPEAKER MODELS)
(a) Check that malfunction disappear when a known good speaker is installed.
Standard: Malfunction disappear
HINT:
Connect the all connectors speakers.
NG REPLACE W/BOX SPEAKER ASSY NO.1
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1419
05-1237
DIAGNOSTICS - AUDIO SYSTEM
10 INSPECT STEREO COMPONENT SPEAKER ASSY(W/ 10 SPEAKER MODELS)
(a) Check that malfunction disappear when a known good speaker is installed.
Standard: Malfunction disappear
HINT:
Connect the all connectors speakers.
NG REPLACE STEREO COMPONENT SPEAKER
ASSY
OK
11 INSPECT W/BOX SPEAKER ASSY NO.2(W/ 10 SPEAKER MODELS)
(a) Resistance check.
(1) Check the resistance between the terminals of the speaker.
NOTICE:
The speaker should not be removed for checking.
Standard: 1.7
NG REPLACE W/BOX SPEAKER ASSY NO.2
OK
12 REPLACE STEREO COMPONENT AMPLIFIER ASSY
OK SYSTEM OK
NG
REPLACE RADIO RECEIVER ASSY
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1420
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