Mitsubishi Lancer (4A9 engine). Manual — part 169

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-338

Inspection Procedure 6: The sound of audio adapter’s input are not played.

CAUTION

Before replacing the radio and CD layer, ensure that the power supply circuit, the earth circuit and the
communication circuit are normal.

COMMENTS ON TROUBLE SYMPTOM
If the audio adapter’s input sound is not output, the
radio and CD player, the audio communication lines
from the radio and CD player or audio adapter may
have a problem.
NOTE: If there is an error with the input from USB
adapter, troubleshoot the USB box or hands free-
ECU. (Refer to <Vehicles with USB box> or <Vehi-
cles with hands free-ECU>.)

PROBABLE CAUSES

• The audio adapter may be defective.

• The radio and CD player may be defective.

• Damaged harness wires and connectors

DIAGNOSIS

STEP 1. Check the radio and CD player
operation.
Check if the radio and CD player work normally and
the sound is output.

Q: Is the check result normal?

Audio Adapter Communication Circuit

AUDIO ADAPTER

RADIO AND CD PLAYER

Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple SI : Silver

AC701094

Connectors: C-105, C-120 <LHD>

BB

C-105

C-120

AC701122 BW

Connectors: C-105, C-120 <RHD>

C-105

C-120

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-339

YES :

Go to Step 2.

NO :

Troubleshoot the radio and CD player
(Refer to ).

Step 2. Check the external sounds input mode.
Check if the radio and CD player is switched to the
external sounds input mode.

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Switch to the external sounds input mode.

STEP 3. Check the audio adapter.
Check if the audio adapter works normally.(Refer to )

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Replace the Audio adapter.

STEP 4. Connector check: C-120 audio adapter
connector and C-105 radio and CD player
connector

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Repair the defective connector.

STEP 5. Check the wiring harness between C-120
audio adapter connector terminal No. 5, 4, 6 and
C-105 radio and CD player connector terminal
No. 14, 13, 4.

• Check the communication lines for open circuit or

short circuit.

Q: Is the check result normal?

YES :

Replace the audio adapter, then go to Step

6.

NO :

Repair the wiring harness.

STEP 6. Check of the troubles
Check that the external input is normal.

Q: Is the check result normal?

YES :

The trouble can be an intermittent

malfunction (Refer to GROUP 00

− How to

use Troubleshooting/inspection Service
Points

− How to Cope with Intermittent

Malfunction ).

NO :

Replace the radio and CD player.

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-340

Inspection Procedure 7: Troubleshooting for noise.

Inspection Procedure 8: The sound volume decreases temporarily. The sound disappears at auto
start by Auto Stop & Go (AS&G) System.<Vehicles with audio amplifier>

CAUTION

• Check that no noise of external origin is present. Because the signal reception becomes poor

indoors, check in the open air. If this check is neglected, the source of noise cannot be deter-
mined, resulting in a false recognition. Therefore, be sure to perform this check.

• When implementing the noise prevention, start the prevention from the object causing the strong-

est noise.

• Check the assembling condition and the connector connection of the radio and CD player.
• Check that the antenna and the radio and CD player are connected.
• Check the antenna and the antenna cable for damage.

Noise types
( ) indicates the
sound type.

Situation

Cause

Countermeasure

Ignition noise:
(Crack, tapping,
rattle, plash)

• When the engine speed

is increased, the
scratch noise becomes
faster and the sound
volume decreases.

• When the ignition

switch is turned to
ACC, the noise
disappears.

• Radiation noise caused

mainly by the spark plug

• Noise wraparound

Check the earth cable, and
replace if necessary.

Wiper motor noise:

(hum, distorted
hum)

Synchronised with the
wiper movement, and also
becomes faster when
wiper movement is sped
up. When the wiper is
stopped, the noise also
stops.

Noise generated by the
wiper motor operation

Check the wiper motor
(Refer to GROUP 51

−

Windshield Wiper,
Inspection .), and replace if
necessary.

Electric mirror
noise:
(hum, distorted
hum)

The noise is generated
when the electric mirror is
operated.

Noise generated by the
electric mirror motor
operation

Check the electric mirror
motor (Refer to GROUP 51
− Door Mirror, Inspection .),
and replace if necessary.

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-341

ON-VEHICLE SERVICE

ADJUSTMENT OF VOLUME AND SOUND
QUALITY AUTOMATIC CORRECTION
FUNCTION

M1544014200248

Static electricity
(cracking, popping)

• No noise is generated

when the vehicle
comes to a complete
stop.

• Louder noise is

generated when the
clutch is disengaged.

The parts or wiring move for
some reason, and cause the
noise by contacting against
the body metal parts.

Return the parts and wiring
to the normal positions.

Various types of noise are
generated in various parts
of the body.

Caused by the looseness
between the body and the
hood, trunk lid, bumper,
exhaust pipe and muffler,
suspension, or others.

Securely tighten the
mounting bolts of each part.

Noise from other
electrical
equipment

−

The noise may be generated
when the electrical
equipment become old.

Repair or replace the
electrical equipment.

No noise is
generated, but the
sound volume
decreases
temporarily at auto
start by Auto Stop &
Go (AS&G)
System. The sound
disappears.<Vehicl
es with audio
amplifier>

• The sound volume

decreases at auto start.
The sound disappears.

• There is no abnormality

at other than the auto
start.

NOTE: If the radio and CD
player is not reset at the
auto start, the radio and
CD player and the audio
amplifier are not defective.

The battery voltage is low.

Diagnose the battery of the
AS&G system, and replace
the battery if necessary.
(Refer to GROUP 17

− Auto

Stop & Go (AS&G) System

−

Troubleshooting <Petrol> or
<Diesel>.)

Noise types
( ) indicates the
sound type.

Situation

Cause

Countermeasure

AC711790

AB

Sound adjustment switch