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)

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TSB Revision

CHASSIS ELECTRICAL

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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)

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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

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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.