Toyota Sequoia (2005). Manual - part 558

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DIAGNOSTICS

AUDIO SYSTEM

DI–2027

2221

Noise occurs

INSPECTION PROCEDURE

1

Check of speaker installation.

CHECK:
Check if each speaker is securely installed.
OK:

Each speaker is securely installed.

HINT:
The radio is equipped with a noise prevention system that blocks excessively loud noise. If such noise oc-
curs, check the all wiring is proper and that the antenna installation part ground and noise–prevention equip-
ment are installed.

Condition in which noise occurs

Noise type

Noise increases when the accelerator pedal is depressed, but stops when

the engine is stopped.

Generator noise

Noise occurs during A/C or the heater operation.

Blower motor noise

Noise occurs when the vehicle accelerates rapidly on an unpaved road or

after the ignition switch is turned on.

Fuel pump noise

Noise occurs when the horn switch is pressed and released or when pressed

and held.

Horn noise

Quiet noise occurs while the engine is running, but stops when the engine is

stopped.

Ignition noise

Noise occurs synchronously with the blink of the turn signal.

Flasher noise

Noise occurs during window washer operation.

Washer noise

Noise occurs while the engine is running, and it continues even after the en-

gine is stopped.

Water temperature sensor noise

Noise occurs during wiper operation.

Wiper noise

Noise occurs when the brake pedal is depressed.

Stop light switch noise

Others.

Static electricity stored on the vehicle

HINT:

Identify the condition under which the noise occurs, and check the noise filter on the related part.

First ensure that the noise is not coming from the outside. Failure to do so makes noise source detec-
tion difficult and may lead to a misdiagnosis.

Noise should be removed in descending order of loudness.

NG

Install it properly.

OK

Identification of noise source (See page 

DI–1964

).

DIDA3–01

DI–2028

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DIAGNOSTICS

AUDIO SYSTEM

2222

Radio broadcast cannot be received (Bad reception)

INSPECTION PROCEDURE

1

Check if radio auto–search functions properly.

CHECK:
Check if the radio auto–search functions properly.

Perform the auto–search of the radio and check that it functions normally.

OK:

The radio auto–search functions properly.

OK

Replace radio receiver assy.

NG

2

Check optional component.

CHECK:
Check for any optional component (sun shade film, telephone antenna etc.).

Check whether or not any optional component such as a sun shade film and telephone antenna is
installed.

OK:

Optional component is not installed.

NG

Effect from optional component.

OK

DIDA4–01

I28352

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DIAGNOSTICS

AUDIO SYSTEM

DI–2029

2223

3

Check antenna for noise production.

CHECK:
Noise Check with Antenna

(1)

With the ignition switch in the ACC position, turn on the radio and choose the AM mode.

(2)

Place the tip of a screwdriver on the antenna of the rear glass antenna, and check that noise is
heard from the speakers.

OK:

Noise occurs.

OK

Replace radio receiver assy.

NG

4

Inspect radio receiver assy (Antenna).

CHECK:
(a)

Preparation for Check
(1)

Remove the antenna plug of the radio receiver as-
sembly.

(b)

Noise Check
(1)

With the radio receiver assy connector connected,
turn the ignition switch to the ACC position.

(2)

Turn on the radio and choose the AM mode.

(3)

Place a screwdriver or a piece of metal such as thin
wire on an antenna jack of the radio receiver assy
and check that noise is heard from the speaker.

OK:

Noise occurs.

NG

Replace radio receiver assy.

OK

Replace antenna cord sub–assy.

DI–2030

–

DIAGNOSTICS

AUDIO SYSTEM

2224

CD cannot be inserted or is ejected right after insertion

INSPECTION PROCEDURE

1

Check if a normal CD is inserted.

CHECK:
Check if a normal CD is inserted.

Make sure that the CD is a normal audio CD, and that there is no deformation, flaw, stain, burr or other
defects on the CD.

OK:

Normal audio CD is inserted.

HINT:

Translucent or oddly–shaped CDs cannot be played.

Computer CD–ROMs (even those with music) and CD–R discs cannot be played.

Playing an 8–cm (3.2 in.) CD does not require an adapter.

NG

End.

OK

2

Check if a CD is inserted properly.

CHECK:
Check if a CD is inserted properly.

Check whether or not the CD is inserted upside down.

OK:

Not upside down.

NG

Set disc correctly.

OK

DIDA5–01