Toyota PT546-00140 User manual

14Scion Display Audio
PT546-00140
TROUBLESHOOTING GUIDE Rev A：5/17/2013

AUDIO MAINUNIT TROUBLESHOOTING
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
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.

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?
6-A
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

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?
9-A.
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

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