Mitsubishi Evolution X. Manual - part 999

RADIO AND CD PLAYER

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CHASSIS ELECTRICAL

54A-357

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 17: Poor reception.

DIAGNOSIS

STEP 1. Check the state of the antenna.

Q: Is the antenna assembled?

YES : 

Go to Step 2.

NO : 

Assemble the 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. Move the vehicle and check the radio.
Move the vehicle to 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.

RADIO AND CD PLAYER

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CHASSIS ELECTRICAL

54A-358

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 18: 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.

RADIO AND CD PLAYER

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CHASSIS ELECTRICAL

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Inspection Procedure 19: Distortion on FM Only.

DIAGNOSIS

STEP 1. Check that the distortion is present 
when the radio is tuned to another station.

Q: Does the distortion persist when the radio is tuned 

to another station?
YES : 

Go to Step 2.

NO : 

The signal from that station is too weak.

STEP 2. Relocate the reception area and check 
the radio.

Q: When relocating the reception area does the 

distortion increase or decrease?
YES : 

The cause may be multipath or fading 

noise. Multipath noise is the echo that 
occurs when the broadcast signal is 
reflected by a large obstruction 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.

NO : 

Replace the radio and CD player. Check 
that a distortion is resolved.

Inspection Procedure 20: Auto select function inoperative, too few automatic stations are selected.

DIAGNOSIS

STEP 1. Check the state of the antenna.

Q: Is the antenna assembled?

YES : 

Go to Step 2.

NO : 

Assemble the antenna. The auto-select 
function should operate normally.

STEP 2. Check the number of radio stations.

Q: Are there sufficient numbers of radio stations 

within the area?
YES : 

Go to Step 3.

NO : 

Go to Step 4.

STEP 3. Check the distance from the 
transmission antenna.

Q: Is there a transmission antenna within a range of 2 

miles?
YES : 

Go to Step 5.

NO : 

Go to Step 4.

STEP 4. The check if there are not that many 
radio stations and when there is no transmission 
antenna in the vicinity.
Execute automatic selection and check to see that 
the strongest radio frequency is receivable within the 
area.

Q: Is reception of the strongest radio frequency 

possible within the area?
YES : 

There is no action to be taken.

NO : 

Go to Step 5.

STEP 5. 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 6.

NO : 

Go to Step 7.

STEP 6. 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 : 

There is no action to be taken.

NO : 

Go to Step 7.

RADIO AND CD PLAYER

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CHASSIS ELECTRICAL

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STEP 7. Check the connection of the antenna 
feeder cable and radio and CD player.

Q: Is the antenna feeder cable thoroughly connected 

to the radio and CD player?
YES : 

Repair or replace the radio and CD player. 

The auto-select function should operate 
normally.

NO : 

Thoroughly connect the antenna feeder 
cable and the radio and CD player. The 
auto-select function should operate 
normally.

Inspection Procedure 21: Preset stations are erased.

.

CIRCUIT OPERATION

Power is continuously supplied to the radio and CD 
player.

.

TECHNICAL DESCRIPTION (COMMENT)

The cause is probably a faulty radio and CD player 
memory backup power supply system circuit.

.

TROUBLESHOOTING HINTS

• Damaged wiring harness or connector

• Malfunction of the radio and CD player

DIAGNOSIS

Refer to Inspection Procedure 1

P.54A-318

.

Inspection Procedure 22: CD can not be inserted.

DIAGNOSIS

STEP 1. Check that a CD has been already 
loaded.

Q: Has a CD been already loaded?

YES : 

Take out the CD (If the CD can not be 

ejected, refer to inspection Procedure 26 

P.54A-362

). Check that a CD can be 

inserted.

NO : 

Go to Step 2.

STEP 2. Check how a CD is inserted.
Ensure that the ignition switch is at 'ACC' or 'ON'.
NOTE: If you try to load a CD when the ignition 
switch is at the positions other than 'ACC' or 'ON,' the 
CD will not be inserted completely and then rejected.

Q: If you try to load the CD, does the CD stops halfway 

and then rejected?
YES : 

Refer to inspection Procedure 26 

P.54A-362

.

NO : 

Go to Step 3.

STEP 3. Check after the CD is loaded.
NOTE: Even though the CD is loaded, 'E01' (vehi-
cles with center display low type) or 'ERROR 01' 
(vehicles with center display middle type) sometimes 
displayed with the CD rejected because of vibra-
tion/shock or dew on the CD face or optical lens.

Q: Though the CD is inserted completely, is ''ERROR " 

displayed and the CD ejected?
YES : 

Go to Step 4.

NO : 

There is no action to be taken.

STEP 4. Check the CD.
Check the CD for the conditions below:

• Is the CD loaded with its label facing down?

• Is the recorded face dirty or scratched?

• Is there dew on the recorded face?

Q: Is the CD in good condition?

YES : 

Go to Step 5.

NO : 

The original CD is defective. Check that a 
CD can be inserted.