Mitsubishi Montero (2002-2004). Manual - part 498

RADIO WITH TAPE PLAYER AND CD PLAYER

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CHASSIS ELECTRICAL

54A-163

STEP 24. Check the wiring harness between tweeter (RH)
connector H-15 (terminals 1 and 2) and amplifier connector
G-19 (terminals 12 and 4).

NOTE: Also check intermediate connectors D-15 and D-124. If
intermediate connector D-15 or D-124 are damaged, repair or
replace the connector as described in GROUP 00E, Harness
Connector Inspection

P.00E-2

Q: Is the wiring harness between tweeter (RH) connector

H-15 (terminals 1 and 2) and amplifier connector G-19
(terminals 12 and 4) in good condition?
YES : Go to Step 25.
NO : Repair the wiring harness. The tweeter (RH) should

sound.

AC204179

CONNECTOR : G-19

HARNESS SIDE

3 2

1110

1312

1
9

1615

1817

AC204181

CONNECTOR : H-15

HARNESS SIDE

AC204171

CONNECTOR : D-15

20 21

17 18

25 26

14 15

AC204170

CONNECTOR : D-124

RADIO WITH TAPE PLAYER AND CD PLAYER

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CHASSIS ELECTRICAL

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STEP 25. Replace the radio and CD player.
Q: Do the speakers sound?

YES : There is no action to be taken.
NO : Repair or replace the amplifier. The tweeter (RH)

should sound.

STEP 26. Check the woofer.
(1) Remove the woofer. Refer to

P.54A-183

(2) Check that the woofer generates noise when a five-volt

voltage is applied on the woofer terminal.

Q: Is the woofer generating noise?

YES : Go to Step 27.
NO : Replace the woofer. The woofer should sound.

STEP 27. Check woofer connector G-01 and amplifier
connector G-19 for loose, corroded or damaged terminals,
or terminals pushed back in the connector.
Q: Are woofer connector G-01 and amplifier connector G-

19 in good condition?
YES : Go to Step 28.
NO : Repair or replace the damaged component(s). Refer

to GROUP 00E, Harness Connector Inspection

P.00E-2

. The woofer should sound.

ACX01868AB

AC204197

CONNECTORS : G-01, G-19

G-19

HARNESS SIDE

G-19

HARNESS SIDE

G-01(B)

3 2

1110

1312

1
9

1615

1817

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CHASSIS ELECTRICAL

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STEP 28. Check the wiring harness between woofer
connector G-01 (terminals 1 and 2) and amplifier connector
G-19 (terminals 8 and 18).
Q: Is the wiring harness between woofer connector G-01

(terminal 1 and 2) and amplifier connector G-19
(terminal 4 and 13) in good condition?
YES : Go to Step 29.
NO : Repair the wiring harness. The woofer should sound.

STEP 29. Replace the radio and CD player.
Q: Do the speakers sound?

YES : There is no action to be taken.
NO : Repair or replace the amplifier. The woofer should

sound.

INSPECTION PROCEDURE 5: 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.

AC204197

CONNECTORS : G-01, G-19

G-19

HARNESS SIDE

G-19

HARNESS SIDE

G-01(B)

3 2

1110

1312

1
9

1615

1817

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CHASSIS ELECTRICAL

54A-166

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 6: 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. Extend antenna completely.
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.

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

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