Page 2481 of 4323
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
Page 2482 of 4323
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
Page 2483 of 4323
I28299
Radio and Navigation Assy
Wire Harness View:
IVO±IVO+
R27
I28752
INT +INT ±
Stereo Component Amplifier Assy
Wire Harness View:
S10
± DIAGNOSTICSNAVIGATION SYSTEM
DI±2281
2475 Author: Date:
2005 SEQUOIA (RM1146U)
8 Check harness and connector (Radio and navigation assy ± stereo component
amplifier assy)
PREPARATION:
Disconnect the radio and navigation assy and stereo compo-
nent amplifier assy connectors.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Symbol
(Tester connection)ConditionSpecified condition
IVO+ (R27±11) ±
INT+ (S10±23)AlwaysBelow 1 W
IVO± (R27±12) ±
INT± (S10±22)AlwaysBelow 1 W
IVO+ (R27±11) ±
Body groundAlways10 kW or higher
IVO± (R27±12) ±
Body groundAlways10 kW or higher
NG Repair or replace harness or connector.
OK
Proceed to next circuit inspection shown in problem symptoms table (See page DI±2184).
Page 2484 of 4323
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
Page 2485 of 4323
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
Page 2486 of 4323
I36938I28293
Stereo Component Amplifier Assy
Wire Harness View:
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
DI±2284
± DIAGNOSTICSNAVIGATION SYSTEM
2478 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check harness and connector (Stereo component amplifier assy ± speaker
assy).
PREPARATION:
Disconnect the connectors from the stereo component amplifi-
er 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 the speaker and body ground
to check for a short circuit in wire harness.
OK:
10 kW or higher
NG Repair or replace harness or connector.
OK
Page 2487 of 4323
I28759
Connector Front View:
F14
F15
± DIAGNOSTICSNAVIGATION SYSTEM
DI±2285
2479 Author: Date:
2005 SEQUOIA (RM1146U)
2 Inspect front door speaker and woofer.
CHECK:
Measure the resistance according to the value(s) in the table
below.
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 and woofer.
OK
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
Page 2488 of 4323
DI±2286
± DIAGNOSTICSNAVIGATION SYSTEM
2480 Author: Date:
2005 SEQUOIA (RM1146U)
4 Inspect rear speaker assy.
CHECK:
Measure the resistance between the terminals of the speaker.
NOTICE:
The speaker should not be removed for checking.
OK:
2.6 ± 0.2 W
NG Replace rear speaker assy.
OK
Proceed to next circuit inspection shown in problem symptoms table (See page DI±2184).