Mitsubishi Galant (2004+). Manual - part 1486

RADIO WITH CD PLAYER

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CHASSIS ELECTRICAL

54A-187

STEP 18. Check rear speaker (RH) connector D-09 and 
audio amplifier connector C-113 for loose, corroded or 
damaged terminals, or terminals pushed back in the 
connector.
Q: Are harness connectors D-09 and C-113 in good 

condition?
YES : Go to Step 19.
NO :  Repair or replace the component(s). Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

. The 

rear speaker (RH) should sound.

AC305233CC

CONNECTOR: C-113

HARNESS SIDE

AC305268

AS

CONNECTOR: D-09

HARNESS SIDE

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CHASSIS ELECTRICAL

54A-188

STEP 19. Check the wiring harness between rear speaker 
(RH) connector D-09 (terminals 1 and 2) and audio 
amplifier connector C-113 (terminals 9 and 1).

NOTE: Also check intermediate connector C-13 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the 
connector. If intermediate connector C-13 is damaged, repair or 
replace the connectors as described in GROUP 00E, Harness 
Connector Inspection 

P.00E-2

.

Q: Is the wiring harness between rear speaker (RH) 

connector D-09 (terminals 1 and 2) and audio amplifier 
connector C-113 (terminals 9 and 1) in good condition?
YES : Replace the audio amplifier. The rear speaker (RH) 

should sound.

NO :  Repair the wiring harness. The rear speaker (RH) 

should sound.

AC305234

CONNECTORS: C-13, C-113

C-13

HARNESS SIDE

C-113

C-113

C-13

BB

AC305268

AS

CONNECTOR: D-09

HARNESS SIDE

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CHASSIS ELECTRICAL

54A-189

INSPECTION PROCEDURE 8: Noise is Present while Moving (AM).

STEP 1. Ask the driver about the noise.
(1) Find out the following information from the owner.
(2) Place where the noise occurs.
(3) Locality conditions (valley, mountain, etc).
(4) Name and frequency of stations affected by 

noise.

Q: What type of noise is detected, vehicle noise or 

external noise?
Vehicle noise : 

It may not be possible to prevent 

noise if the signal is weak. Go to step 2.

External noise : 

In almost all cases, prevention on 

the receiver side is next to impossible when 
the signal is weak. Go to Step 4.

STEP 2. Ask the driver about the location where 
the noise occurs.

Q: Does the noise occur when entering or near a 

particular structure (building, tunnel, mountain, 
etc)?
YES : 

Go to Step 3.

NO : 

Go to Step 4.

STEP 3. Check if the noise can be eliminated by 
adjusting the radio.
(1) Adjust the radio as follows.
(2) Change to a different station with a stronger 

signal. This will boost the systems resistance to 
outside interference.

(3) Suppress high tones to reduce noise.

Q: Has the noise been eliminated?

YES : 

The noise has now been eliminated. Inform 

the customer that it is normal to hear noise 
while receiving a weak station.

NO : 

Go to Step 4.

STEP 4. Check for the noise.

Q: Does noise still exist? 

YES : 

If there is still more noise than on other 

similar radio’s find out the type of noise. Ask 
the owner for the name and frequency of the 
affected stations, and consult with the radio 
manufacturer service center.

NO : 

System is operating normally.

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INSPECTION PROCEDURE 9: Noise is Present while Moving (FM).

.

DIAGNOSIS
NOTE: FM waves have the same properties as light, 
and can be deflected and blocked. FM signal recep-
tion is severely degraded in the shadow of obstruc-
tions such as buildings or mountains. An FM receiver 
will then only receive a reflected signal.
1. The signal becomes weak as the distance from 

the station's transmission antenna increases. The 
signal strength received depends on the signal 
strength of the transmitting station and intervening 
obstructions such as buildings and hills. Generally 
speaking, the area of good reception is 
approximately 20 

− 25 km (12 − 16 miles) for 

stereo reception, and 30 

− 40 km (19 − 25 miles) 

for monaural reception.

2. The signal will becomes weak when an area of 

shadow from the transmitting antenna (places 
where there are obstructions such as mountains 
or buildings between the station transmitter and 
the vehicle), and noise will appear. <This is called 
first fading, and gives a steady buzzing noise.>

3. If a direct signal hits the antenna at the same time 

as a signal reflected by obstructions such as 
mountains or buildings, interference of the two 
signals will generate noise. When moving, noise 
will appear each time the vehicle's antenna 
passes through this kind of obstructed area. The 
strength and interval of the noise varies according 
to the signal strength and the conditions of 
deflection. <This is called multipath noise, and is a 
repetitive buzzing.>

4. Since FM stereo transmission and reception has a 

weaker field than monaural, it is often 
accompanied by a hissing noise.

After taking measures to prevent the noise, check 
that no noise occurs.
5. Change to a different station with a stronger wave 

to boost resistance to interference.

6. Suppress high tones to reduce noise.
7. Does vehicle have an antenna which extend? If 

not eliminate this step.

If there is noise, the following causes can be consid-
ered.
8. If due to vehicle noise: It may not be possible to 

prevent noise if the signal is weak.

9. If due to external noise: In almost all cases, 

prevention on the receiver side is not possible. 
Weak signals especially are susceptible to 
interference.

If there is more noise than on radios in other vehi-
cles, find out the noise condition and the name and 
frequency of the receiving stations from the owner, 
and consult with the radio manufacturer's service 
center.

ACX01869

10kW
OUTPUT FM
BROAD CAST

FOR STEREO:
20 - 25 km
(12 - 16 miles)

FOR  MONAURAL:
30 - 40 km (19 - 25 miles)

FOR  HOME STEREO:
80 - 90 km (50 - 56 miles)

MALTIPATH INTERFERENCE

FIRST FADING
INTERFERENCE

AC