Mitsubishi Galant 9G. Manual — part 1577

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CHASSIS ELECTRICAL

54A-180

STEP 16. Check the wiring harness between rear speaker
(LH) connector D-12 (terminals 1 and 2) and audio
amplifier connector C-113 (terminals 2 and 10).

NOTE: Also check intermediate connector C-28 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the
connector. If intermediate connector C-28 is damaged, repair or
replace the connectors as described in GROUP 00E, Harness
Connector Inspection

P.00E-2

.

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

connector D-12 (terminals 1 and 2) and audio amplifier
connector C-113 (terminals 2 and 10) in good condition?
YES : Replace the audio amplifier. The rear speaker (LH)

should sound.

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

should sound.

STEP 17. Check the rear speaker (RH).
(1) Remove the rear speaker (RH). Refer to

P.54A-209

.

(2) Check that the rear speaker (RH) generates noise when a

five-volt voltage is applied on the rear speaker (RH)
terminal.

Q: Is the rear speaker (RH) generating noise?

YES : Go to Step 18.
NO : Replace the rear speaker (RH). The rear speaker

(RH) should sound.

AC305233CC

CONNECTOR: C-113

HARNESS SIDE

AC305268

AU

CONNECTOR: D-12

HARNESS SIDE

AC305231AE

CONNECTOR:C-28

ACX01868AB

5V

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CHASSIS ELECTRICAL

54A-181

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-182

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-183

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.

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.

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