Mitsubishi Outlander XL. Manual — part 1093

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)?

YES:

Consult the radio manufacturer's service

center.

NO:

If there is more noise than other radios,

consult the radio manufacturer's service
center.

Inspection Procedure 7: Noise is overpowering both AM and FM.

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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 to see

that the noise is gone.

STEP 2. Verify that the noise occur when the
engine is stopped or the engine is running.

Q:Does noise occur when the engine is stopped ?

YES(When the engine is stopped):

Go to Step 3.

NO(When the engine is running):

Check the

vehicle's noise suppressor. (Refer to
Inspection Procedure 9 P.54B-54.)

STEP 3. Verify 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 4.

STEP 4. 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 5.

NO:

Consult the radio manufacturer's service

center.

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

Q:Is the antenna plug thoroughly connected to the

radio and CD player?

YES:

Go to Step 7.

NO:

Go to Step 6.

STEP 6. Verify that the noise is eliminated when
the antenna plug is properly attached.

Q:Is the noise eliminated?

YES:

Consult the radio manufacturer's service

center.

NO:

Go to Step 7.

STEP 7. Verify that the antenna is in good
condition and is it properly mounted.

Q:Is the antenna in good condition and is it

properly mounted?

YES:

Consult the radio manufacturer's service

center.

NO:

Either repair or replace the antenna

assembly. Check to see that the noise is gone.

Inspection Procedure 8: Excessive noise on AM and FM.

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DIAGNOSIS
Radio reception can be affected by Radio Frequency
(RF) emissions from a variety of sources. The

AUDIO AND NAVIGATION SYSTEM

54B-53

DIAGNOSIS

disturbance is even greater if the station is weak or
poorly tuned. FM reception is not as sensitive to
disturbances as AM. AM reception is sensitive to
electrical disturbances such as power lines, lightening
and other types of similar electrical phenomena.

STEP 1. Check if the customer heard the noise
under any of the following conditions.

｠

A motorcycle was passing.

｠

Lighting was flashing.

｠

Passed beneath a power line.

｠

Passed beneath a telephone line.

｠

Passed by a signal generator.

｠

Passed by any other sources of electrical noise.

｠

Passed under a bridge or through a tunnel.

Q:Did the noise occur during any of the

circumstances listed above?

YES:

The observed noise is normal.

NO:

Go to Step 2.

STEP 2. Compare the customer's radio to another
identical model.
Operate the radio in a vehicle with a known good
audio system of the same type as the customer's.

Q:Is there more noise on the customer's radio?

YES:

Check all power and ground connections. If

all connections are in good condition, consult
the radio manufacturers service center.

NO:

The observed noise is normal.

Inspection Procedure 9: Noise is detected with engine running.

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DIAGNOSIS

Never connect a noise filter to the high tension
cable (spark plug wire). Spark plug wires
incorporate resistors which have the effect of
suppressing noise. If a spark plug wire is found to
be causing noise, it must be replaced.

Confirm that the noise is not from an external
source.

Noise prevention should be performed by
suppressing strong sources of noise first.

NOTE:

Voltage surges can be induced in the

electrical system by the collapse of a field (i.e.

When power is removed from the coil in an A/C
compressor clutch). This induced voltage surge
will radiate a Radio Frequency (RF) signal that is
picked up by the audio unit. In the case of the
compressor clutch a "pop" will be heard through
the speakers. The capacitor, installed on this
vehicle, will store the excess voltage and prevent
the production of RF noise. This is because the
capacitor will charge and discharge as the voltage
fluctuates. This has the effect of "attracting"
noise and bleeding it to ground without
interfering with the normal flow of current
through the system.

Description of noise

Condition

Cause

Solution

AM, FM: ignition noise
(popping,

snapping,

cracking, buzzing)

｠

Increasing the engine
speed

causes

the

generator whine to
speed up and the
volume to decrease.

｠

Disappears when the
ignition switch turned to
"ACC", and engine is
off.

｠

Electrical interference
from the spark plugs.

｠

Engine noise.

｠

Check or replace the
ground cable.

｠

Check or replace spark
plug wires.

｠

Check or replace the
noise capacitor.

54B-54

AUDIO AND NAVIGATION SYSTEM

DIAGNOSIS

Description of noise

Condition

Cause

Solution

Other

electrical

components

-

Noise may intensify due
to

aging

electrical

components.

Repair or replace the
electrical components.

Static electricity (cracking,
crinkling)

Noise disappears when
the vehicle is completely
stopped.

Noise occurs when parts
or wiring move and
contact vehicle body.

Return parts or wiring to
their proper position.

Static electricity (cracking,
crinkling)

Various

noises

are

produced depending on
the body part of the
vehicle.

This may be due to the
recent removal of the
front hood, bumpers,
exhaust pipe and muffler,
suspension, etc.

｠

Properly ground parts.

｠

Properly ground all
body parts.

ZC6023140000

Ground cable

Engine mount

ZC6023150000

Noise capacitor

ZC602316

Noise capacitor

0000

INSPECTION PROCEDURE 10: Noise appears during vibration or shocks.

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STEP 1. Check the fit of the mast antenna.

Q:Is the mast antenna base fitted securely?

YES:

Go to Step 2.

NO:

Install the mast antenna, and tighten the mounting

nut (Refer to P.54B-173). Check that there is no noise.

AUDIO AND NAVIGATION SYSTEM

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DIAGNOSIS

STEP 2. Check the fit of antenna feeder cable.

Q:Is the antenna feeder cable fitted securely?

YES:

Go to Step 3.

NO:

Ensure that the antenna base and the radio and CD

player or CD changer are fitted securely. Check that there
is no noise.

STEP 3. 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 electricity 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 4.

NO:

It may be static electricity noise.

STEP 4. 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 5.

NO:

Tighten the screw securely. Check that there is no

noise.

STEP 5. Check by replacing radio and CD player or CD
changer.

Q:Do the other radio and CD player or CD changer work

normally?

YES:

Either repair or replace the original radio and CD

player or CD changer. Check that there is no noise.

NO:

Either repair or replace the antenna assembly. Check

that there is no noise.

Inspection Procedure 11: Noise is present while moving (FM).

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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 broad casting.

NOTE:

Multipath noise and fading noise: Because

of the frequency of FM waves in extremely high, it

54B-56

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