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

 

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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

 

 

 

 

 

 

 

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