Mitsubishi Montero (2004+). Manual — part 552

RADIO WITH TAPE PLAYER AND CD PLAYER

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CHASSIS ELECTRICAL

54A-177

INSPECTION PROCEDURE 11: Noise Appears During Vibration or Shocks.

DIAGNOSIS

STEP 1. Check radio and CD player connector D-06 and
amplifier connector G-19 <with amplifier> for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Are radio and CD player connector D-06 and amplifier

connector G-19 <with amplifier> in good condition?
YES : Go to Step 2.
NO : Repair or replace the damaged component(s). Refer

to GROUP 00E, Harness Connector Inspection

P.00E-2

. Check that there is no noise.

STEP 2. Check that noise appears when the radio switch is
turned on while the vehicle is stopped and the radio is
tapped while tuned away from a station.
NOTE: Body static electric from the shock absorber rubber
bushings used to prevent vibration, tires, etc. occurs because
of separation from the ground, causing a buzzing noise. Since
no measures can be taken to discharge the static electricity of
the vehicle body. Check that there is no noise.
Q: Does noise appear when the radio switch is turned on

while the vehicle is stopped and the radio is tapped
while tuned away from a station?
YES : Go to Step 3.
NO : It may be static electricity noise.

STEP 3. Verify that the radio is correctly grounded.

The radio is connected to the ground with an assembling
screw.
Q: Is the radio correctly grounded?

YES : Go to Step 4.
NO : Tighten the screw securely. Check that there is no

noise.

AC204170

CONNECTOR : D-06

CS

HARNESS SIDE

1
7

2
8

10

11

5

13

6

14

12

4

9

3

AC204179

CONNECTOR : G-19

AV

HARNESS SIDE

3 2

1110

4

1312

1
9

5

6

1615

7

8

1817

14

RADIO WITH TAPE PLAYER AND CD PLAYER

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CHASSIS ELECTRICAL

54A-178

STEP 4. Check by replacing radio and CD player.
Q: Do the other radio and CD player work normally?

YES : Either repair or replace the original radio and CD

player. Check that there is no noise.

NO : Either repair or replace the antenna assembly. Check

that there is no noise.

INSPECTION PROCEDURE 12: Noise is Present While Moving (FM).

DIAGNOSIS

STEP 1. Check the state of the antenna.

Q: Is the mast antenna assembled?

YES :

Go to Step 2.

NO :

Assemble the mast antenna. Check that
there is no noise.

STEP 2. Check the radio after adjusting it.

Q: Readjust the radio. Is the noise eliminated?

YES :

Check that there is no noise.

NO :

Go to Step 3.

STEP 3. Check with several broadcasting
stations.
NOTE: Multipath noise and fading noise: Because of
the frequency of FM waves in extremely high, it is
highly susceptible to effects from geological forma-
tions and buildings. These effects disrupt the broad-
cast signal and obstruct reception in several ways.

.

•

Multipath noise
This describes the echo that occurs when the
broadcast signal is reflected by a large obstruc-
tion and enters the receiver with a slight time
delay relative to the direct signal (repetitious
buzzing).

•

Fading noise
This is a buzzing noise that occurs when the
broadcast signal is disrupted by obstructing
objects and the signal strength fluctuates intri-
cately within a narrow range.

Q: Is the problem station or location specific?

YES :

The effect of an electrical field condition

(multipath noise, fading noise) could be the
cause. Check that there is not noise.

NO :

Go to Step 4.

STEP 4. Check that noise appears when the radio
switch is turned on while the vehicle is stopped.
NOTE: Body static electric from the shock absorber
rubber bushings used to prevent vibration, tires, etc.
occurs because of separation from the ground, caus-
ing a buzzing noise. There is no measures to dis-
charge the static electricity of the vehicle body.
Check that there is no noise.

Q: Does noise appear when the radio switch is turned

on while the vehicle is stopped and the radio is
tapped while tuned away from a station?

YES :

Go to Step 5.

NO :

It may be static electricity noise.

STEP 5. Verify that the radio is correctly
grounded.

The radio is connected to the ground with an assem-
bling screw.

Q: Is the radio correctly grounded?

YES :

Go to Step 6.

NO :

Tighten the screw securely. Check that
there is no noise.

STEP 6. Check by replacing radio and CD player.

Q: Do the other radio and CD player work normally?

YES :

Either repair or replace the original radio

and CD player. Check that there is no noise.

NO :

Either repair or replace the antenna
assembly. Check that there is no noise.

RADIO WITH TAPE PLAYER AND CD PLAYER

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CHASSIS ELECTRICAL

54A-179

INSPECTION PROCEDURE 13: Constant Noise.

DIAGNOSIS

Use the Symptom Chart to diagnose the possible
cause(s) of the noise. Noise is often created by the
following factors:

• Traveling conditions of the vehicle

• Terrain of area traveled through

• Surrounding buildings

• Signal conditions

• Time period

If there are still problems with noise, even after per-
forming inspection procedures 7 to 14, obtain infor-
mation on the factors listed above. Determine
whether the problem occurs on AM or FM, the station
names, frequencies, etc. and contact the radio man-
ufacturer's service center.

INSPECTION PROCEDURE 14: No reception (AM).

DIAGNOSIS

STEP 1. Check the state of the antenna.

Q: Is the mast antenna assembled?

YES :

Go to Step 2.

NO :

Assemble the mast antenna. The radio
should sound normally.

STEP 2. Check to see if inspections are taking
place is an area exposed to special electric
fields.

Q: Are inspections taking place under special electric

field conditions? (underground garage, inside a
building, etc.)?

YES :

Go to Step 3.

NO :

Go to Step 4.

STEP 3. Relocate and check the radio.

Automatically receive in a good reception area that is
not exposed to special electric fields.

Q: Is reception of the strongest radio frequency

possible within the area?

YES :

There is no action to be taken.

NO :

Go to Step 4.

STEP 4. Tune the radio, and then check it.

Q: Did the sensitivity improve after tuning?

YES :

There is no action to be taken.

NO :

Go to Step 5.

STEP 5. Check the connection of the antenna
plug and radio and CD player.

Q: Is the antenna plug thoroughly connected to the

radio and CD player?

YES :

Go to Step 6.

NO :

Thoroughly connect the antenna plug and
the radio and CD player. The radio should
sound normally.

STEP 6. Check by replacing radio and CD player.

Q: Do the other radio and CD player work normally?

YES :

Either repair or replace the original radio

and CD player. The radio should sound
normally.

NO :

Either repair or replace the antenna
assembly. The radio should sound normally.

RADIO WITH TAPE PLAYER AND CD PLAYER

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CHASSIS ELECTRICAL

54A-180

INSPECTION PROCEDURE 15: Poor Reception.

DIAGNOSIS

STEP 1. Check the state of the antenna.

Q: Is the mast antenna assembled?

YES :

Go to Step 2.

NO :

Assemble the mast antenna. Check that a
poor reception is resolved.

STEP 2. Check to see if inspections are taking
place is an area exposed to special electric
fields.

Q: Are inspections taking place under special electric

field conditions? (underground garage, inside a
building, etc.)?
YES :

Go to Step 3.

NO :

Go to Step 4.

STEP 3. Relocate and check.
Automatically receive in a good reception area that is
not exposed to special electric fields.

Q: Is reception of the strongest radio frequency

possible within the area?
YES :

Check that a poor reception is resolved.

NO :

Go to Step 4.

STEP 4. Tune the radio, and then check it.

Q: Did the sensitivity improve after tuning?

YES :

Check that a poor reception is resolved.

NO :

Go to Step 5.

STEP 5. Check with several broadcasting
stations.
NOTE: Two types of noise are addressed in this pro-
cedure, multipath and fading noise. The frequency of
FM waves is extremely high. This makes them sus-
ceptible to effects from geological formations and
buildings. These effects disrupt the broadcast signal
and obstruct reception in many ways.

.

•

Multipath noise is the echo that occurs when the
broadcast signal is reflected by a large obstruc-
tion and enters the receiver with a slight time
delay relative to the direct signal (repetitious
buzzing).

•

A fading or buzzing noise may occur when the
broadcast beam is disrupted by obstructing
objects and the signal strength fluctuates within a
narrow range.

Q: Is the abnormality in reception generated only

within a certain range?
YES :

Check that a poor reception is resolved.

NO :

Go to Step 6.

STEP 6. Check the connection of the antenna
plug and radio and CD player.

Q: Is the antenna plug thoroughly connected to the

radio and CD player?
YES :

Go to Step 7.

NO :

Thoroughly connect the antenna plug and
the radio and CD player. Check that a poor
reception is resolved.

STEP 7. Check by replacing radio and CD player.

Q: Do the other radio and CD player work normally?

YES :

Either repair or replace the original radio

and CD player. Check that a poor reception
is resolved.

NO :

Either repair or replace the antenna
assembly. Check that a poor reception is
resolved.