Mitsubishi Montero (2002-2004). Manual — part 500
RADIO WITH TAPE PLAYER AND CD PLAYER
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CHASSIS ELECTRICAL
54A-171
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.
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.
RADIO WITH TAPE PLAYER AND CD PLAYER
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CHASSIS ELECTRICAL
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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.
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.
RADIO WITH TAPE PLAYER AND CD PLAYER
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CHASSIS ELECTRICAL
54A-173
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.
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.
RADIO WITH TAPE PLAYER AND CD PLAYER
TSB Revision
CHASSIS ELECTRICAL
54A-174
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.
INSPECTION PROCEDURE 16: Distortion on AM and/or FM.
.
DIAGNOSIS
STEP 1. Check the level of distortion.
Q: How much distortion is there?
Occasional distortion :
Go to Step 2.
Constant distortion :
Go to Step 3.
STEP 2. Check the location of the distortion.
Q: Is there distortion when the vehicle is near the
radio station?
YES :
The antenna is receiving too strong a signal.
NO :
Go to Step 3.
STEP 3. Check the wires at each speaker.
Q: Are the speaker wires contacting the paper
speaker cone?
YES :
Move the speaker wires away from the
paper speaker cone. The speaker should
now be free of distortion.
NO :
Go to Step 4.
STEP 4. Remove the speakers, and check the
paper cone for foreign material or damage.
Q: Is there foreign material or damage on the paper
cone of the speaker?
YES :
Repair or replace the speakers. The
speaker should now be free of distortion.
NO :
Go to Step 5.
STEP 5. Check for distortion with the speaker
installed.
Q: Does a distortion occur?
YES :
Install the speaker securely. The speaker
should now be free of distortion.
NO :
Repair or replace the radio and CD player.
The speaker should now be free of
distortion.
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