Toyota Sequoia (2005). Manual — part 621
I28759
F14
Connector Front View:
–
DIAGNOSTICS
NAVIGATION SYSTEM
DI–2279
2473
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 connection
Specified condition
1 – 2
Approx. 3.15
Ω
3 – 4
Approx. 2.78
Ω
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
I36938
I28293
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
–
DIAGNOSTICS
NAVIGATION SYSTEM
2474
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)
Condition
Specified condition
F14–1 – T12–3
Always
Below 1
Ω
F14–2 – T12–4
Always
Below 1
Ω
T12–2 – S9–2 (FL+)
Always
Below 1
Ω
T12–1 – S9–11 (FL–)
Always
Below 1
Ω
F14–1 – Body ground
Always
10 k
Ω
or higher
F14–2 – Body ground
Always
10 k
Ω
or higher
T12–1 – Body ground
Always
10 k
Ω
or higher
T12–2 – Body ground
Always
10 k
Ω
or higher
NG
Repair or replace harness or connector.
OK
I28299
Radio and Navigation Assy
Wire Harness View:
IVO–
IVO+
R27
I28752
INT +
INT –
Stereo Component Amplifier Assy
Wire Harness View:
S10
–
DIAGNOSTICS
NAVIGATION SYSTEM
DI–2281
2475
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)
Condition
Specified condition
IVO+ (R27–11) –
INT+ (S10–23)
Always
Below 1
Ω
IVO– (R27–12) –
INT– (S10–22)
Always
Below 1
Ω
IVO+ (R27–11) –
Body ground
Always
10 k
Ω
or higher
IVO– (R27–12) –
Body ground
Always
10 k
Ω
or higher
NG
Repair or replace harness or connector.
OK
Proceed to next circuit inspection shown in problem symptoms table (See page
DI–2282
–
DIAGNOSTICS
NAVIGATION SYSTEM
2476
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
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