2001 TOYOTA SEQUOIA speaker

DID9K±01
I27726
Radio Receiver Assy
Rear Door Speaker Tweeter
Rear Door Speaker Front Door Speaker (*1)
Front Door Speaker and
Woofer (*2)Steering Pad
Switch
Instrument Panel J/B

RAD NO. 2 Fuse

ECU±B Fuse

AM1 FuseEngine Room J/B

RAD NO. 1 Fuse

RAD NO. 3 Fuse
Ignition Switch
Disc Player
Controller
(*3)
Stereo
Component
AmplifierMulti±display
Controller (*3)
VTR
Terminal
(*3)Headphone
Terminal
(*3, *4)
Television Display Assy (*3)
Rear Seat Audio
Controller Assy (*4)
Radio Sub
Antenna*1: Built±in Type Amplifier
*2: Separate Type Amplifier
*3: w/ RSE System
*4: w/ RSA System Radio Main Antenna
DI±1956
± DIAGNOSTICSAUDIO SYSTEM
2150 Author: Date:
2005 SEQUOIA (RM1146U)
LOCATION

DID9L±01
I28760
Built±in Type Amplifier:
Radio
Receiver
Assy
Steering Pad SwitchSpeakers Sound Signal Operation
Signal
Sound Signal
± DIAGNOSTICSAUDIO SYSTEM
DI±1957
2151 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DIAGRAM

I28735
Separate Type Amplifier:
Steering Pad Switch
AVC±LAN Speakers
Sound SignalOperation
Signal
Radio
Receiver
Assy Stereo
Component
Amplifier
Assy
Multi±display
Controller
Assy (*1)
Rear Seat Audio
Controller (*2)
*1: w/ Rear Seat Entertainment System
*2: w/Rear Seat Audio System
Display Signal DI±1958
± DIAGNOSTICSAUDIO SYSTEM
2152 Author: Date:
2005 SEQUOIA (RM1146U)

DID9Q±01
± DIAGNOSTICSAUDIO SYSTEM
DI±1967
2161 Author: Date:
2005 SEQUOIA (RM1146U)
PROBLEM SYMPTOMS TABLE
NOTICE:
For the troubleshooting procedures of the audio system with a navigation system, refer to the navi-
gation system (See page DI±2184).
RADIO RECEIVER ASSY
HINT:
Inspect the ºFuseº and ºRelayº before confirming the suspected area as shown in the charts below.
SymptomSuspected AreaSee page
Pressing power switch does not start system.3. Power source circuit (radio receiver assy)
4. Radio receiver assyDI±1990
±
A audio system cannot be operated.1. Steering pad switch circuit
2. Radio receiver assyDI±1995
±
No sound cannot be heard (Separate type amplifier).
1. Power source circuit (stereo component amplifier assy)
2. Sound signal circuit
3. Speaker circuit
4. AVC±LAN circuit (radio receiver assy ± stereo compo-
nent amplifier)
5. AVC±LAN circuit (radio receiver assy ± rear seat audio
controller) w/ RSA system
6. AVC±LAN circuit (radio receiver assy ± multi±display
controller) w/ RSE system
7. Mute signal circuit
8. Stereo component amplifier assy
9. Radio receiver assyDI±1993
DI±2011
DI±2013
DI±2023
DI±2061
DI±2139
DI±2008
±
±
No sound cannot heard (Built±in type amplifier).
1. Power source circuit (radio receiver assy)
2. Speaker circuit
3. Radio receiver assyDI±1990
DI±2013
±
Sound quality is bad in all modes (volume is too low).
(Separate type amplifier)
1. Power source circuit (radio receiver assy)
2. Power source circuit (stereo component amplifier assy)
3. Speaker circuit
4. Sound signal circuit
5. Sound quality is bad in all modes (volume is too low)
6. Stereo component amplifier assyDI±1990
DI±1993
DI±2013
DI±2011
DI±2026
±
Sound quality is bad in all modes (volume is too low).
(Built±in type amplifier)1. Power source circuit (radio receiver assy)
2. Speaker circuit
3. Sound quality is bad in all modes (volume is too low)DI±1990
DI±2013
DI±2026
Noise occurs.±DI±2027
Radio broadcast cannot be received (bad reception).±DI±2028
CD cannot be inserted or is ejected right after insertion.1. Power source circuit (radio receiver assy)
2. CD cannot be inserted or is ejected right after insertionDI±1990
DI±2030
CD cannot be ejected.1. Power source circuit (radio receiver assy)
2. CD cannot be ejectedDI±1990
DI±2032
Sound quality is bad only when playing CD (volume is too low).±DI±2033
CD sound skips.±DI±2034
Cassette tape cannot be inserted or played.1. Power source circuit (radio receiver assy)
2. Cassette tape cannot be inserted or playedDI±1990
DI±2036
Cassette tape cannot be ejected.1. Power source circuit (radio receiver assy)
2. Cassette tape cannot be ejectedDI±1990
DI±2038
Sound quality is bad only when playing tape.±DI±2040
Tape is tangled due to incorrect tape speed or auto±reverse mal-
function.±DI±2042

I28378
Radio Receiver Assy
R±W 17
R4
MUTE S10
Stereo Component Amplifier
MUTE DI±2008
± DIAGNOSTICSAUDIO SYSTEM
2202 Author: Date:
2005 SEQUOIA (RM1146U)
Mute signal circuit
CIRCUIT DESCRIPTION
This circuit sends a signal to the stereo component amplifier to mute noise. Because of that, the noise pro-
duced by changing the sound source ceases.
If there is an open in the circuit, noise can be heard from the speakers 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
an extremely small sound can be produced.
WIRING DIAGRAM
DID9Y±01

I28505
WRadio Receiver Assy
G 429
8
R B
R4L+
L± Stereo Component
Amplifier Assy
R+
R±
GND 19
18
10 3
S10
5
Shielded L+
L± R+
R±S10
S10
S10
S106R4
R4
R4
R4 SGND
± DIAGNOSTICSAUDIO SYSTEM
DI±2011
2205 Author: Date:
2005 SEQUOIA (RM1146U)
Sound signal circuit
CIRCUIT DESCRIPTION
The radio receiver assy sends a sound signal to the stereo component amplifier assy through this circuit.
The sound signal that has been sent is amplified by the stereo component amplifier assy, and then sent to
the speakers.
If there is an open or short in the circuit, sound cannot be heard from the speakers even if there is no malfunc-
tion in the stereo component amplifier assy or the speakers.
WIRING DIAGRAM
DID9Z±01

± DIAGNOSTICSAUDIO SYSTEM
DI±2013
2207 Author: Date:
2005 SEQUOIA (RM1146U)
Speaker circuit
CIRCUIT DESCRIPTION
The sound signal that has been amplified by the stereo component amplifier is sent to the speakers from
the stereo component amplifier through this circuit.
If there is a short in this circuit, the stereo component amplifier assy (built±in amp) detects it and stops output
to the speakers.
Thus sound cannot be heard from the speakers even if there is no malfunction in the stereo component am-
plifier assy (built±in amp) or the speakers.
DIDA0±01

I28503
Stereo Component
Amplifier Assy
IB1 S9 T12
Tweeter RH
F14 Front Door Speaker
and Woofer LH
F15 Front Door Speaker
and Woofer LH
T13
Tweeter RHII2
J/C
BC1
BA1 R10
Rear Door
Speaker RH
R9
Rear Door
Speaker LHJ/C BC1
BA1II2
II2
II2
J49 J48
J49 J48
J34 J33
J34 J33IB1
IB1
IB1S9
S9
S9
S9
S9
S9
S9
S9
S9
S9
S9FL±
WFL+
WFR±
FR+
RR+
RL+ FL+
WFL±
WFR+
FR±
RR±
RL± 11
2
6
17
18
7
3
5 12
14
4
13 2
3 4
1 31
2 4
23
4 1
2
3 4
15
4
6
7
2
1
10
9
11 12
11 12 2 1
2 1I
C
HB
KE
LF V
P
G
L±W LRV
P
G L±W
R Y
L LGR Y
L LG V
P
R
WR
WR
W
Y B
Y B
Y B Separate Type Amplifier: DI±2014
± DIAGNOSTICSAUDIO SYSTEM
2208 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM