Mitsubishi L200. Manual - part 729

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-283

AC504001

AB

Earth cable

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-284

Inspection Procedure 9: Some noise appears when there is vibration or shocks during travelling.

DIAGNOSIS PROCEDURE

STEP 1. Connector check: Radio and CD player 
connector C-125, C-126 and audio amplifier 
connector D-30, D-31 <vehicle with audio 
amplifier>.

Q: Is radio and CD player connector C-125 and audio 

amplifier connector D-30, D-31 <vehicle with audio 

amplifier> in good condition?
YES : 

Go to Step 2.

NO : 

Repair or replace the connector. Check that 
there is no noise.

STEP 2. Check that noise appear when the radio 
switch is turned on while the vehicle is stopped 
and the radio is tapped while tuned away from a 
station.
NOTE: Static electricity noise: Body static electric 
from the shock absorber rubber bushings used to 
prevent vibration, tires, etc. occurs because of sepa-
ration from the earth, causing a buzzing noise. Since 
no measures can be taken to discharge the static 
electricity of the vehicle body. Check that there is no 
noise.

Q: Does noise appear when the radio switch is turned 

on while the vehicle is stopped and the radio is 
tapped while tuned away from a station?
YES : 

Go to Step 3.

NO : 

It may be static electricity noise.

STEP 3. Check that the radio correctly earthed. 
The radio is connected to the earth with an assem-
bling screw.

Q: Is the radio correctly earthed?

YES : 

Go to Step 4.

NO : 

Tighten the screw securely. Check that 
there is no noise.

STEP 4. Check by replacing the radio and CD 
player.

Q:  Are operations normal when using another radio 

and CD player?
YES : 

Either repair or replace the radio and CD 

player. Check that there is no noise.

NO : 

Either repair or replace the antenna 
assembly. Check that there is no noise.

AC903856BU

Harness side

Connectors: C-125, C-126 <LHD>

C-125

C-126

C-125

Harness side

C-126

AC903868

CR

Harness side

Connectors: C-125, C-126 <RHD>

C-125

C-126

C-125

Harness side

C-126

AC903885AB

Connectors: D-30, D-31 <LHD>

D-30

Harness side

D-31

Harness side

D-30

D-31

AC903886 AB

Connectors: D-30, D-31 <RHD>

D-30

Harness side

D-31

Harness side

D-30

D-31

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-285

Inspection Procedure 10: Ever-present noise.

DIAGNOSIS PROCEDURE

Noise is often created by the following factors, and 
often the radio is OK when it is checked individually.

• Travelling conditions of the vehicle

• Terrain of area travelled through

• Surrounding buildings

• Signal conditions

• Time period

For this reason, if there are still problems with noise 
even after the measures described in inspection pro-
cedure 5 to 9 have been taken, get information on 
the factors listed above as well as determining 
whether the problem occurs with AM/FM/WM/LW, 
the station names, frequencies, etc. and contact the 
radio manufacturer's service centre.

Inspection Procedure 11: There is noise but no reception for both AM and FM or no sound from AM, 
or no sound from FM.

DIAGNOSIS PROCEDURE

STEP 1. Check the state of the antenna.

Q: Is the antenna assembled?

YES : 

Go to Step 2.

NO : 

Assemble the antenna.

STEP 2. Check to see if inspections are taking 
place is an area exposed to special electric 
fields.

Q:  Are inspections taking place under special electric 

field conditions (underground garage, inside a 
building, etc).?
YES : 

Go to Step 3.

NO : 

Go to Step 4.

STEP 3. Relocate and check.
Automatically receive in a good reception area that is 
not exposed to special electric fields.

Q:  Is reception of the strongest radio frequency 

possible within the area?
YES : 

There is no action to be taken.

NO : 

Go to Step 4.

STEP 4. Tune then check.

Q:  Did the sensitivity improve after tuning?

YES : 

There is no action to be taken.

NO : 

Go to Step 5.

STEP 5. Check the connection of the antenna 
plug and the radio and CD player.

Q:  Is the antenna plug thoroughly connected to the 

radio and CD player?
YES : 

Go to Step 6.

NO : 

Thoroughly connect the antenna plug and 
the radio and CD player.

STEP 6. Check by replacing the radio and CD 
player.

Q:  Are operations normal when using another radio 

and tape player or CD player?
YES : 

Either repair or replace the radio and CD 

player.

NO : 

Either repair or replace the antenna 
assembly.

Inspection Procedure 11: There is noise but no reception for LW/MW/FM or no sound from LW/MW/
FM.

DIAGNOSIS PROCEDURE

STEP 1. Check the state of the antenna.

Q: Is the antenna assembled?

YES : 

Go to Step 2.

NO : 

Assemble the antenna. 

STEP 2. Check to see if inspections are taking 
place is an area exposed to special electric 
fields.

Q:  Are inspections taking place under special electric 

field conditions (underground garage, inside a 
building, etc).?

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-286

YES : 

Go to Step 3.

NO : 

Go to Step 4.

STEP 3. Relocate and check.
Automatically receive in a good reception area that is 
not exposed to special electric fields.

Q: Is reception of the strongest radio frequency 

possible within the area?
YES : 

There is no action to be taken.

NO : 

Go to Step 4.

STEP 4. Tune then check.

Q:  Did the sensitivity improve after tuning?

YES : 

There is no action to be taken.

NO : 

Go to Step 5.

STEP 5. Check the connection of the antenna 
plug and the radio and CD player.

Q: Is the antenna plug thoroughly connected to the 

radio and CD player?
YES : 

Go to Step 6.

NO : 

Thoroughly connect the antenna plug and 
the radio and CD player.

STEP 6. Check by replacing the radio and CD 
player.

Q:  Are operations normal when using another radio 

and CD player?
YES : 

Either repair or replace the radio and CD 

player.

NO : 

Either repair or replace the antenna 
assembly.

Inspection Procedure 12: Poor reception.

DIAGNOSIS PROCEDURE

STEP 1. Check the state of the antenna.

Q: Is the antenna assembled?

YES : 

Go to Step 2.

NO : 

Assemble the antenna. Check that a poor 
reception is resolved.

STEP 2. Check to see if inspections are taking 
place is an area exposed to special electric 
fields.

Q:  Are inspections taking place under special electric 

field conditions (underneath garage, inside a 
building, etc).?
YES : 

Go to Step 3.

NO : 

Go to Step 4.

STEP 3. Relocate and check.
Automatically receive in a good reception area that is 
not exposed to special electric fields.

Q:  Is reception of the strongest radio frequency 

possible within the area?
YES : 

Move the vehicle to check the trouble 

symptom.

NO : 

Go to Step 4.

STEP 4. Tune then check.

Q:  Did the sensitivity improve after tuning?

YES : 

This diagnosis is complete.

NO : 

Go to Step 5.

STEP 5. Check with several broadcasting 
stations.
NOTE: Multipath noise and fading noise: Because 
the frequency of FM waves is extremely high, it is 
highly susceptible to effects from geological forma-
tions and buildings. These effects disrupt the broad-
cast signal and obstruct reception in several ways. 

.

Multipath noise

•

This describes the echo that occurs when the 
broadcast signal is reflected by a large obstruc-
tion and enters the receiver with a slight time 
delay relative to the direct signal (repetitious 
buzzing).

.

Fading noise

•

This is a buzzing noise that occurs when the 
broadcast beam is disrupted by obstructing 
objects and the signal strength fluctuates intri-
cately within a narrow range.

Q: Is the abnormality in reception generated only 

within a certain range?
YES : 

Check that a poor reception is resolved.

NO : 

Go to Step 6.

STEP 6. Check the connection of the antenna 
plug and the radio and CD player.

Q: Is the antenna plug thoroughly connected to the 

radio and CD player?