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Mitsubishi 380. Manual - part 921

RADIO WITH CD PLAYER

CHASSIS ELECTRICAL

54A-218

INSPECTION PROCEDURE 17: 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 or radio,

CD player and CD changer. The speaker should now
be free of distortion.

RADIO WITH CD PLAYER

CHASSIS ELECTRICAL

54A-219

INSPECTION PROCEDURE 18: 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 or radio, CD player

and CD changer. Check that a distortion is resolved.

INSPECTION PROCEDURE 19: Auto Select Function Inoperative, too Few Automatic Stations are
Selected.

DIAGNOSIS

STEP 1. Check the number of radio stations.

Q: Are there sufficient numbers of radio stations within the

area?
YES : Go to Step 2.
NO : Go to Step 3.

STEP 2. Check the distance from the transmission
antenna.

Q: Is there a transmission antenna within a range of 3.2

kilometres?
YES : Go to Step 4.
NO : Go to Step 3.

RADIO WITH CD PLAYER

CHASSIS ELECTRICAL

54A-220

STEP 3. 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 stron-
gest 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 4.

STEP 4. 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 5.
NO : Go to Step 6.

STEP 5. 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 6.

STEP 6. Check the connection of the antenna feeder cable
and radio and CD player or radio, CD player and CD
changer.

Q: Is the antenna feeder cable thoroughly connected to the

radio and CD player or radio, CD player and CD
changer?
YES : Repair or replace the radio and CD player or radio,

CD player and CD changer. The auto-select function
should operate normally.

NO : Thoroughly connect the antenna feeder cable and the

radio and CD player or radio, CD player and CD
changer. The auto-select function should operate
normally.

RADIO WITH CD PLAYER

CHASSIS ELECTRICAL

54A-221

INSPECTION PROCEDURE 20: Preset Stations are Erased.

CIRCUIT OPERATION

Power is continuously supplied to the radio and CD
player or radio, CD player and CD changer.

TECHNICAL DESCRIPTION (COMMENT)

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

TROUBLESHOOTING HINTS

• Refer to circuit diagrams GROUP-

• Refer to configuration diagrams GROUP-

• Damaged wiring harness or connector.

• Malfunction of the radio and CD player or radio,

CD player and CD changer.

DIAGNOSIS

Required Special Tool:

• MB991223: Harness set

STEP 1. Measure at radio and CD player or radio, CD
player and CD changer connector C-111 in order to check
the power supply circuit to the radio and CD player or
radio, CD player and CD changer (through the battery).
(1) Disconnect radio and CD player or radio, CD player and CD

changer connector C-111, and measure at the wiring
harness side.

(2) Measure the voltage between terminal number 11 and

ground.

• The voltage should measure approximately 12 volts

(battery positive voltage).

Q: Is the measured voltage approximately 12 volts (battery

positive voltage)?
YES : Either repair or replace the radio and CD player or

radio, CD player and CD changer. Check that a
memory is retained.

NO : Go to Step 2.

16DB543A

C-29

CONNECTORS: C-29

54DB041A

HARNESS SIDE

1110

CONNECTOR: C-111

54DB041A

HARNESS SIDE

1110

CONNECTOR: C-111

AC209365

1110

CONNECTOR C-111
(HARNESS SIDE)

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