Page 2217 of 4323
I28504
FL±
FR+
RR+ RL+ FL+
FR±
RR± RL± IB1
54
VP
V P
IB1R2
R3R2
R3
R3
R3 R2
R22
6
L LG
L LG
5
2 6 T12
Tweeter LH
312 4
1
3
1 9 10
II2
II2 V PL R
312 4T13
Tweeter RH 1
2
1
2
B Y
R WB Y
R WB Y
R W 1 2
1 2BA1
BC1BA1
BC1Junction
Connector
Junction
Connector J34 J33
J49 J48 11
12
11
12J34 J33
J49J48B L
KF
E
H
IC F16
Front Door
Speaker LH
F17
Front Door
Speaker RH
R9
Rear Door
Speaker LH
R10
Rear Door
Speaker RHRadio Receiver Assy Built±in Type Amplifier:
± DIAGNOSTICSAUDIO SYSTEM
DI±2015
2209 Author: Date:
2005 SEQUOIA (RM1146U)
Page 2218 of 4323
DI±2016
± DIAGNOSTICSAUDIO SYSTEM
2210 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check apparatus.
CHECK:
Choose the apparatus to be inspected.
ApparatusGo to step
Separate type amplifierA
Built±in type amplifierB
B Go to step 6.
A
Page 2219 of 4323
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
Page 2220 of 4323
I28759
Front Door Speaker Assy and Woofer
Connector Front View:
F14
F15
DI±2018
± DIAGNOSTICSAUDIO SYSTEM
2212 Author: Date:
2005 SEQUOIA (RM1146U)
3 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
4 Inspect tweeter.
CHECK:
Check that 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 and the left one.
OK Replace tweeter.
NG
Page 2221 of 4323
± DIAGNOSTICSAUDIO SYSTEM
DI±2019
2213 Author: Date:
2005 SEQUOIA (RM1146U)
5 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±1967).
Page 2222 of 4323
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
Page 2223 of 4323
± DIAGNOSTICSAUDIO SYSTEM
DI±2021
2215 Author: Date:
2005 SEQUOIA (RM1146U)
7 Inspect front door speaker assy.
CHECK:
Measure the resistance between the terminals of the speaker.
NOTICE:
The speaker should not be removed for checking.
OK:
Approximately 4 W
NG Replace front door speaker assy.
OK
8 Inspect tweeter assy.
CHECK:
Check that 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 and the left one.
OK Replace tweeter.
NG
Page 2224 of 4323
DI±2022
± DIAGNOSTICSAUDIO SYSTEM
2216 Author: Date:
2005 SEQUOIA (RM1146U)
9 Inspect rear speaker assy.
CHECK:
Measure the resistance between the terminals of the speaker.
NOTICE:
The speaker should not be removed for checking.
OK:
Approximately 4 W
NG Replace rear speaker assy.
OK
Proceed to next circuit inspection shown in problem symptoms table (See page DI±1967).