2001 TOYOTA SEQUOIA wiring diagram

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

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

I36938I28293
Stereo Component Amplifier Assy:
RR+
FL+RL+
WFL+
RR±FL±
RL± WFL± WFR±
WFR+
FR± FR+
S9
I28355
Rear Speaker Connector Front View:
R10
R9
I28757
Front Door Speaker Assy and Woofer
Connector Front View:
F14
F15
I28758
Tweeter Connector Front View:
T12
T13
± DIAGNOSTICSAUDIO SYSTEM
DI±2017
2211 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check harness and connector (Stereo component amplifier assy ± Speaker
assy).
PREPARATION:
Disconnect the connectors from the radio receiver assy and
speakers.
CHECK:
Measure the resistance between the speaker and the stereo
component amplifier to check for an open circuit in the wire har-
ness.
OK:
Below 1 W
CHECK:
Measure the resistance between each speaker and body
ground to check for a short circuit in wire harness.
OK:
10 kW or higher
HINT:
Refer to the wiring diagram for connection of each terminal.
NG Repair or replace harness or connector.
OK

I28754
Radio Receiver Assy
Wire Harness View:
FL±
FL+
FR+ RR±
RL±
RR+RL+
R2R3
FR±
I28355
Front Door Speaker Assy and Rear
Speaker Connector Front View:
F17
F16
R9
R10
I28758
Tweeter Assy Connector Front View:
T12
T13
DI±2020
± DIAGNOSTICSAUDIO SYSTEM
2214 Author: Date:
2005 SEQUOIA (RM1146U)
6 Check harness and connector (Radio receiver assy ± Speaker assy).
PREPARATION:
Disconnect the connectors from the radio receiver assy and
speakers.
CHECK:
Measure the resistance between the speaker and the radio re-
ceiver assy to check for an open circuit in the wire harness.
OK:
Below 1 W
CHECK:
Measure the resistance between each speaker and body
ground to check for a short circuit in wire harness.
OK:
10 kW or higher
HINT:
Refer to the wiring diagram for connection of each terminal.
NG Repair or replace harness or connector.
OK

I28506
Stereo Component
Amplifier Assy
Radio Receiver Assy
TX+
S10
R4 V
P
TX±
S10 R4TX+
TX± 20 5
19 15
± DIAGNOSTICSAUDIO SYSTEM
DI±2023
2217 Author: Date:
2005 SEQUOIA (RM1146U)
AVC±LAN circuit (Radio receiver assy ± stereo component ampli-
fier)
CIRCUIT DESCRIPTION
Each unit of the audio system connected to the AVC±LAN (communication bus) transfers the signal of each
switch by communication.
When a short to +B or short to ground occurs in this AVC± LAN, the audio system will not function normally
as communication is discontinued.
In this AVC±LAN, the radio receiver assy becomes the master of the communication, and the radio receiver
assy has resistance necessary for communication.
WIRING DIAGRAM
DIDA1±01

DIDAM±01
I28496
B±O
24R24
Rear Seat Audio
Controller Assy
ACC
+B
17
GND 1228 C
4 3A36
ACC Cut
Relay
B 12 1Sub J/B No.3
3A
ID2 W±R
J/C
L±Y1
2
IA1 26 L±R
L±R
2B3
2C8
2D Engine Room J/B
ECU±BShort Pin
1 Instrument Panel J/B
W±R
AM11
3 2RAD No.2
W 1
P6
ALT
1B
BatteryLG To ECM
GR
RSE
2 2
1Engine Room R/B No.2J37
ID221
IMLG 3A
LG
12
ID2 J38
L±R
2 12
W±LRAD No.1
W±R
W±L 1
2B
3
AM1B
ACC
I18
Ignition SW 1C
1C 1E1F
1J
1LGR
PW±R
GR
W±B 58
4F10
Fusible Link Block DI±2058
± DIAGNOSTICSREAR SEAT AUDIO SYSTEM
2252 Author: Date:
2005 SEQUOIA (RM1146U)
CIRCUIT INSPECTION
Power source circuit (Rear seat audio controller)
CIRCUIT DESCRIPTION
This circuit provides the power to the rear seat audio controller.
WIRING DIAGRAM

I28599I28773
w/o Navigation:
Radio Receiver Assy
Rear Seat Audio Controller
R19
Stereo Component Amplifier AssyTX± TX+
S10 ID2
LG
LG
V
P L 9
10
5
R41522
R24
23
TX1± TX1+
TX± TX+27 26
TX± TX+ 20
19 R19
R4LGID2 R24
S10
± DIAGNOSTICSREAR SEAT AUDIO SYSTEM
DI±2061
2255 Author: Date:
2005 SEQUOIA (RM1146U)
AVC±LAN circuit
CIRCUIT DESCRIPTION
Each unit of the rear seat audio system connected to the AVC±LAN (communication bus) transfers the signal
of each switch by communication.
When a short to +B or short to ground occurs in this AVC± LAN, the audio system will not function normally
as communication is discontinued.
WIRING DIAGRAM
DIDAN±01