Toyota PT546-00140 Troubleshooting Manual

14Scion Display Audio

PT546-00140

TROUBLESHOOTING GUIDE Rev A：5/17/2013

AUDIO MAINUNIT TROUBLESHOOTING

No.

PROBLEM

1

GENERAL

No power coming in.

2 One or more speakers do not work.

3 Sound quality poor.

4

RADIO

Power coming in, but radio not operating.

5 Either AM or FM does not work.

5 Reception poor (volume faint).

5 Few preset tuning bands.

6 Sound quality poor.

7 Cannot set station select button.

7 Preset memories disappear.

8 Analog reception can receive but, HD radio can not receive.

9 HD reception is poor and sound is mute frequently.

10

CD PLAYER

CD cannot be inserted.

11 Power coming in, but CD player not operating.

12 Sound jumps.

13 Sound quality poor (Volume faint).

14 CD will not eject.

15

NOISE

Noise produced by vibration or shock while driving.

16 Noise produced when engine starts.

17 Noise heard occasionally.

18

AUX

Cannot select AUX mode.

19 Sound quality poor (Volume faint).

20

ASL

ASL ineffective (sound level will not increase).

21

USB

Sound quality poor.

22 USB device connected, but cannot select USB mode.

23

iPod/USB

Head unit can play USB devices, but not iPod.

24

iPod

Head unit can operate iPod, but not charge it.

25

Bluetooth

Bluetooth setup menu is not displayed.

26

MAP Screen

MAP Screen is not displayed.

APPLY TO: PT546-00140

HINT:
This inspection procedure is a simple troubleshooting that should be carried out on the
vehicle during system operation and was prepared on the assumption of system component
troubles (except for the wires and connectors, etc.).
Always inspect the trouble taking the following into consideration.
*Open or short circuit of the wire harness
*Connector or terminal connection fault

1

GENERAL

No power coming in.

Check if the fuse is OK.

Is ACC applied to head unit?

Is +B applied to head unit?

Check if GND (wire harness side) to

head unit is OK?

Head unit faulty.

Replace fuse.

ACC wire harness faulty.

+B wire harness faulty.

GND faulty.

Yes

No

No

Yes

No

No

Yes

Yes

2

GENERAL

One or more speakers do not work.

Is there continuity in the speaker wire

harness?

Temporarily install another speaker.

Is the function OK?

Head unit faulty.

Speaker wire harness faulty.

Speaker faulty.

Yes

No

No

Yes

No

Yes

Check volume control.

Check fade, balance settings.

Check for proper connection to head unit.

Head unit faulty.

Yes

No

No

Yes

Yes

No

Head unit faulty.

Please connect proper to head unit.

Do non-functioning speakers produce hiss?

Head unit faulty.

3

GENERAL

Sound quality poor.

Head unit faulty.

Yes

Yes

Are all the connectors for speakers connected?

Speaker wire harness is faulty.

Check fade, balance settings.

No

Please set up a fade and balance

settings correctly.

Yes

Check treble, bass settings.

No

Please set up a treble and bass
settings correctly.

Dose the setting of the vehicle type match?

Please set up a vehicle type
correctly.

No

Yes

Check input the device.

Check for bad speakers.
No

No

No

Input device is faulty.

Yes

4

RADIO

Power coming in, but radio not operating.

Is CD player operating normally?

Is there continuity in speaker wire harness?

Temporarily install another speaker.

Is the function OK?

Head unit faulty.

5

RADIO

Either AM or FM does not work, reception poor (volume faint),

few preset tuning bands.

Problem with radio wave signals or location?

Are both AM and FM defective?

Head unit faulty.

Speaker wire harness faulty.

Speaker faulty.

Poor signals, poor location.

Head unit faulty.

Go to No.2

Yes

Yes

No

No

No

Yes

Yes

No

No

Yes

Check antenna installation to vehicle.

Check antenna connection to head-unit.

Yes

Yes

No

Please install a antenna

to vehicle.

Please connect a antenna
to head-unit.

No

6

RADIO

Sound quality poor.

Is sound quality always bad?

Is CD player operating normally?

Is the antenna properly installed?

Temporarily install another antenna.

Is the sound quality OK?

Is the sound quality certain?

Is the sound quality with other modes good?

Head unit faulty.

Go to step 6-A

Go to No.4

Install properly

Antenna faulty.

Head unit faulty.

Poor signals, poor location.

No

Yes

Yes

Yes

No

Yes

No

Yes

No

No

6-A

7

RADIO

Cannot set station select button, Preset memories disappear.
Can CD be inserted in CD player?

Check radio fuse is OK?

Are ACC and +B applied to head unit ?

8

RADIO

Analog reception can receive but, HD radio can not receive.
Is radio setting of HD active?

Problem with radio wave signals or location?

Is analog reception good?

Head unit faulty.

Replace fuse.

ACC and +B wire harness

faulty.

Check if GND (wire harness side) to head unit is

OK?

GND faulty.

Head unit faulty.

Set HD ON at audio

settings.

Poor signals, poor location.

Head unit faulty.

Go to No.6

Yes

No

No

No

Yes

Yes

No

Yes

Yes

No

Yes

No

No

Yes

Check if the station can broadcast HD.

Yes

The receiving station
which can broadcast HD.

No

9

RADIO

HD reception is poor and sound is mute frequently.
Problem with radio wave signals or location?

Is there continuity in antenna wire harness?

Is there analog reception is good?

Is there continuity in speaker wire harness?

Temporarily install another speaker.

Is the function OK?

Head unit faulty.

Poor signals, poor location.

Antenna wire harness

faulty.

Head unit faulty.

Go to No.6

Speaker wire harness faulty.

Speaker faulty.

Yes

No

No

Yes

Yes

No

Yes

No

No

Yes

9-A.

10

CD PLAYER

CD cannot be inserted.

Is CD already inserted?

Is +B applied to head unit ?

Is ACC applied to head unit ?

Check if GND (wire harness side) to head unit is

OK?

Head unit faulty.
Eject CD.

+B wire harness faulty.

ACC wire harness faulty.

GND wire harness faulty

Yes

No

Yes

Yes

Yes

No

No

No

11

CD PLAYER

Power coming in, but CD player not operating.

Is CD inserted correct side up?

Is the function OK if inserted different CD?

Is radio operating normally?

Is temperature inside interior panel hot?

Head unit faulty.

Insert CD the correct side up.

CD faulty.

Go to step 9-A

Protective circuit in operation.

It is necessary for the internal

temperature of the head unit until

to fall.

No

Yes

No

Yes

No

No

Yes

Yes

Is the correct CD type/shape inserted?

Insert the correct CD type/shape.

Yes

No

13

CD PLAYER

Sound quality poor (Volume faint).

12

CD PLAYER

Sound jumps.

Yes

Yes

No

No

Does sound jump only during strong vibration?

Jumping caused by vibration.

Functions OK if different CD inserted.

Head unit faulty.

Yes

Yes

No

No

Yes

Yes

No

No

Functions OK if another Disc inserted?

Check another modes: AM, FM, etc.

Is radio operating normally?
Disc faulty.

Is speaker properly installed?

Temporarily install another speaker.

Is the function OK?

Speaker faulty.

Install properly

Head unit faulty.

CD faulty.

14

CD PLAYER

CD will not eject.

15

NOISE

Noise produced by vibration or shock while driving.

Are connectors properly plugged into head unit?
No

No

No

Yes

No

Yes

Yes

Yes

Is +B applied to radio receiver assembly?

Check if radio fuse is OK?

Is ACC applied to radio receiver assembly?

Replace fuse.

+B wire harness faulty.

Check if GND (wire harness side) to radio

receiver assembly is OK?

GND wire harness faulty.

ACC wire harness faulty.

Head unit faulty.

Yes

No

Yes

Is speaker properly installed?

With vehicle stopped, lightly tap headunit.

Is noise produced?

No

Install properly.

Noise produced by static electricity accumulating

in the vehicle body.

No

Plug properly.

Yes

Head unit faulty.

Is antenna cable properly plugged into

head unit?

Yes

No

Plug properly.