2001 TOYOTA SEQUOIA speaker

I28484
WRadio and
Navigation Assy
G 429
8
R BR30L+
L± Stereo Component
Amplifier Assy
R+
R±
SLD 19
18
10 3
S10
5
(Shielded) L+
L± R+
R±S10
S10
S10
S106
SGNDR30
R30
R30
R30 DI±2274
± DIAGNOSTICSNAVIGATION SYSTEM
2468 Author: Date:
2005 SEQUOIA (RM1146U)
Amplifier 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
DIDDJ±01

I28478
Stereo Component
Amplifier Assy
IB1 S9
T12
Tweeter LH F14
Front Door Speaker
and Woofer LH
IB1 IB1
IB1
S9S9
S9 WFL+
FL± WFL±
FL+
112 6 1712
2
3 4 23
41
5 4 67
1R G
L±W
L
VP L±W S1023
22
S10 INT+
INT±
G
VP11
13 R27 W
B
(Shielded)Radio and Navigation Assy
IVO+
IVO±
SLD1 R27
R27 DI±2276
± DIAGNOSTICSNAVIGATION SYSTEM
2470 Author: Date:
2005 SEQUOIA (RM1146U)
Speaker circuit (Navigation voice)
CIRCUIT DESCRIPTION
This circuit is used when the voice guidance in the radio and navigation assy is on.
Voice guidance of the navigation system is heard from the front door speaker LH via the tweeter LH.
WIRING DIAGRAM
DIDDL±01

I28759
Connector Front View:
F14
± DIAGNOSTICSNAVIGATION SYSTEM
DI±2277
2471 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Inspect apparatus.
CHECK:
Choose the apparatus to be inspected.
RESULT:
ApparatusGo to step
Front door speaker LHA
Front door speaker LH and tweeter LHB
B Go to step 5.
A
2 Inspect front door speaker assy.
PREPARATION:
Disconnect the speaker connector.
CHECK:
Measure the resistance between the terminals of the speaker.
NOTICE:
The speaker should not be removed for checking.
OK:
Tester connectionSpecified condition
1 ± 2Approx. 3.15 W
3 ± 4Approx. 2.78 W
NG Replace front door speaker.
OK

I28757
F14 Front Door Speaker
Connector Front View:
I28758
T12 Tweeter Connector front View:
DI±2278
± DIAGNOSTICSNAVIGATION SYSTEM
2472 Author: Date:
2005 SEQUOIA (RM1146U)
3 Inspect tweeter.
CHECK:
Check that the malfunction disappears when another tweeter in 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 with the left one.
OK Replace tweeter.
NG
4 Check harness and connector (Front door speaker ± tweeter).
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester connectionConditionSpecified condition
F14±1 ± T12±3AlwaysBelow 1 W
F14±2 ± T12±4AlwaysBelow 1 W
F14±1 ± Body groundAlways10 kW or higher
F14±2 ± Body groundAlways10 kW or higher
NG Repair or replace harness or connector.
NG
Proceed to next circuit inspection shown on problem symptoms table (See page DI±2184).

I28759
F14
Connector Front View:
± DIAGNOSTICSNAVIGATION SYSTEM
DI±2279
2473 Author: Date:
2005 SEQUOIA (RM1146U)
5 Inspect front door speaker assy.
PREPARATION:
Disconnect the speaker connector.
CHECK:
Measure the resistance between the terminals of the speaker.
NOTICE:
The speaker should not be removed for checking.
OK:
Tester connectionSpecified condition
1 ± 2Approx. 3.15 W
3 ± 4Approx. 2.78 W
NG Replace front door speaker.
OK
6 Inspect tweeter.
CHECK:
Check that the malfunction disappears when another tweeter in 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 with the left one.
OK Replace tweeter.
NG

I36938I28293
Stereo Component Amplifier Assy
Wire Harness View:
FL±FL+ S9
I28757
Front door Speaker Assy
Connector Front View:
F14
I28758
T12
Tweeter Connector Front View:
DI±2280
± DIAGNOSTICSNAVIGATION SYSTEM
2474 Author: Date:
2005 SEQUOIA (RM1146U)
7 Check harness and connector (Front door speaker assy ± tweeter, stereo compo-
nent amplifier assy)
PREPARATION:
Disconnect the stereo component amplifier assy connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester connection
(Symbol)ConditionSpecified condition
F14±1 ± T12±3AlwaysBelow 1 W
F14±2 ± T12±4AlwaysBelow 1 W
T12±2 ± S9±2 (FL+)AlwaysBelow 1 W
T12±1 ± S9±11 (FL±)AlwaysBelow 1 W
F14±1 ± Body groundAlways10 kW or higher
F14±2 ± Body groundAlways10 kW or higher
T12±1 ± Body groundAlways10 kW or higher
T12±2 ± Body groundAlways10 kW or higher
NG Repair or replace harness or connector.
OK

DI±2282
± DIAGNOSTICSNAVIGATION SYSTEM
2476 Author: Date:
2005 SEQUOIA (RM1146U)
Speaker circuit
CIRCUIT DESCRIPTION
A sound signal amplified by the amplifier located in the radio and navigation assy is sent to each speaker
through this circuit.
If there is a short in this circuit, the stereo component amplifier assy detects it and stops output to the speak-
ers.
Thus sound can not be heard from the speakers even if there is no malfunction in the stereo component
amplifier or the speakers.
DIDDM±01

I28477
Stereo Component
Amplifier Assy
IB1 S9 T12
Tweeter LH
F14 Front Door Speaker
and Woofer LH
F15 Front Door Speaker
and Woofer RH
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 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
J34 J33
± DIAGNOSTICSNAVIGATION SYSTEM
DI±2283
2477 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM