Mitsubishi Montero Sport (2004+). Manual — part 558

RADIO AND TAPE PLAYER

TSB Revision

CHASSIS ELECTRICAL

54-219

STEP 49. Check the harness wires between amplifier
connector E-11 (terminal No.7 and 8) and rear door
speaker (RH) connector F-22 (terminal No.1 and 2).

NOTE: After inspecting intermediate connectors E-01, inspect
the wire. If intermediate connector E-01 is damaged, repair or
replace it. Refer to GROUP 00E, Harness Connector Inspec-
tion

P.00E-2

.

Q: Are the harness wires between amplifier connector

E-11 (terminal No.7 and 8) and rear door speaker (RH)
connector F-22 (terminal No.1 and 2) in good condition?
YES : Go to Step 50.
NO : Repair or replace them. Refer to GROUP 00E,

Harness Connector Inspection

P.00E-2

.

AC201711

3 2

1110

4

1312

1
9

5

6

1615

7

8

1817

14

4 5

3

1
2

CONNECTORS: E-01, E-11

E-11 COMPONENT SIDE

AB

E-01

E-11

E-01

AC201710

CONNECTOR: F-22

REAR
DOOR
(RH)

2

1

AB

COMPONENT
SIDE

F-22 (B)

RADIO AND TAPE PLAYER

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CHASSIS ELECTRICAL

54-220

STEP 50. Check amplifier connector E-11 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.

Q: Is the amplifier connector E-11 in good condition?

YES : Go to Step 51.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

.

STEP 51. Recheck for malfunction.
Q: Is a malfunction eliminated?

YES : This procedure is complete. (If no malfunctions are

found in all steps, an intermittent malfunction is
suspected. Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Point

− How to

Cope with Intermittent Malfunction

P.00-7

.)

NO : Go to Step 47.

INSPECTION PROCEDURE 4: Noise Appears at Certain Places when Traveling (AM).

.

DIAGNOSIS

STEP 1. Check that the noise occur when
entering or near a particular structure (building,
tunnel, mountain, etc.).

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 2.

STEP 2. After taking the following measures to
prevent the noise, check that no noise appears.
(1) Change to a different station with a stronger wave

to boost resistance to interference.

(2) Suppress high tones to reduce noise.
(3) Extend antenna completely.

Q: Do the following measures eliminate the noise?

YES :

The following causes can be considered.

NO :

Go to Step 4.

STEP 3. Ask the owner about the state of 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: Which is the noise, vehicle noise or external

noise?

Vehicle noise :

It may not be possible to prevent

noise if the signal is weak.

External noise :

In almost all cases, prevention on

the receiver side is impossible. Weak
signals especially are susceptible to
interference. Go to Step 4.

STEP 4. Check that there is no noise.

Q: Does noise still exist?

YES :

If there is more noise than on radios in other

vehicles, 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.

NO :

Normal.

AC200776

CONNECTOR: E-11

AC

COMPONENT SIDE

3 2

1110

4

1312

1
9

5

6

1615

7

8

1817

14

E-11(B)

RADIO AND TAPE PLAYER

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CHASSIS ELECTRICAL

54-221

INSPECTION PROCEDURE 5: Noise Appears at Certain Places when Traveling (FM).

.

DIAGNOSIS
NOTE: About FM waves: FM waves have the same
properties as light, and can be deflected and
blocked. Wave reception is not possible in the
shadow of obstructions such as buildings or moun-
tains.
1. The signal becomes weak as the distance from

the station's transmission antenna increases. This
may depend on the signal strength of the
transmitting station and intervening geographical
formation of buildings. 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 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. During traveling, 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.

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

prevention on the receiver side is impossible.
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)

MULTIPATH INTERFERENCE

FIRST FADING
INTERFERENCE

AC

RADIO AND TAPE PLAYER

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CHASSIS ELECTRICAL

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INSPECTION PROCEDURE 6: Mixed with Noise, Only at Night (AM).

The following factors can be considered as possible
causes of noise appearing at night.
1. Factors due to signal conditions: Due to the fact

that long-distance signals are more easily
received at night, even stations that are received
without problem during the day may experience
interference in a general worsening of reception
conditions. The weaker a station is the more
susceptible it is to interference, and a change to
different station or the appearance of a beating
sound* may occur.
NOTE: Beat sound*: Two signals close in fre-
quency interfere with each other, creating a repeti-
tious high-pitched sound. This sound is generated
not only by sound signals but electrical waves as
well.

2. Factors due to vehicles noise: Generator noise

may be a cause.

.

DIAGNOSIS

STEP 1. Check that the noise is still obvious even
when the lights are off.

Q: Is the noise still obvious even when the lights are

off?

YES :

Go to Step 2.

NO :

Go to Step 3.

STEP 2. Check that the following actions
disappear the noise.
(1) Tune to a station with a stronger wave.
(2) Tune to a station with a stronger wave without

completely extending the antenna (Mast
antenna).

Q: Is there more noise than on radio in other

vehicles?

YES :

Consult the radio manufacturer's service

center.

NO :

Check that there is no noise.

STEP 3. Check that the noise fades away when
the vehicle harness is moved away from the
radio (if the harness is not in the proper
position).

Q: Does the noise fade away when the vehicle

harness is moved any from the radio (If the
harness is not in the proper position)?

NO :

If there is more noise than other radios,
consult the radio manufacturer's service
center.

INSPECTION PROCEDURE 7: Broadcasts can be Heard but Both AM and FM Have a Lot of Noise.

DIAGNOSIS

STEP 1. Check that the noise occurs when the
engine is stopped or the engine is running.

Q: Does noise occur when the engine is stopped or

the engine is running?

When the engine is stopped :

Go to Step 2.

When the engine is running :

Check the vehicle's

noise suppressor. (Refer to Inspection
Procedure 9

P.54-225

.)

STEP 2. Check that the following actions
disappear the noise.
(1) Tune to a station with a stronger wave.
(2) Extend the antenna completely (Mast antenna).
(3) Adjust the sound quality to suppress high tones.

Q: Is the noise eliminated?

YES :

Consult the radio manufacturer's service

center.

NO :

Go to Step 3.

STEP 3. Check that the radio is correctly
grounded.

Q: Is the radio correctly grounded?

YES :

Go to Step 4.

NO :

Consult the radio manufacturer's service
center.