Mitsubishi Montero (2002-2004). Manual - part 501

RADIO WITH TAPE PLAYER AND CD PLAYER

TSB Revision

CHASSIS ELECTRICAL

54A-175

INSPECTION PROCEDURE 17: 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.

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 : 

Repair or replace the radio and CD player. 
Check that a distortion is resolved.

INSPECTION PROCEDURE 18: Auto Select Function Inoperative, too Few Automatic Stations are 
Selected.

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 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 WITH TAPE PLAYER AND CD PLAYER

TSB Revision

CHASSIS ELECTRICAL

54A-176

STEP 7. 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 : 

Repair or replace the radio and CD player. 

The auto-select function should operate 
normally.

NO : 

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

INSPECTION PROCEDURE 19: 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.

Memory Backup Power Supply Circuit

AC204170

CONNECTORS : D-06, D-28

DJ

D-06

D-28

RADIO WITH TAPE PLAYER AND CD PLAYER

TSB Revision

CHASSIS ELECTRICAL

54A-177

DIAGNOSIS

Required Special Tool:

• MB991223: Harness set

STEP 1. Measure at radio and CD player connector D-06 in 
order to check the power supply circuit to the radio and 
CD player (through the battery).
(1) Disconnect radio and CD player connector D-06, and 

measure at the wiring harness side.

(2) Measure the voltage between terminal number 11 and 

ground by backprobing.

• The voltage should equal approximately 12 volts (bat-

tery positive voltage).

Q: Is the measured voltage approximately 12 volts (battery 

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

Check that a memory is retained.

NO :  Go to Step 2.

STEP 2. Check radio and CD player connector D-06 for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Is radio and CD player connector D-06 in good 

condition?
YES : Go to Step 3.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Check that a memory is retained.

AC204170

CONNECTOR : D-06

CS

HARNESS SIDE

1
7

2
8

10

11

5

13

6

14

12

4

9

3

AC204738DS

HARNESS SIDE: D-06

6

14

4 5

13

11

3

9 10

2
8

1
7

12

AC204170

CONNECTOR : D-06

CS

HARNESS SIDE

1
7

2
8

10

11

5

13

6

14

12

4

9

3

RADIO WITH TAPE PLAYER AND CD PLAYER

TSB Revision

CHASSIS ELECTRICAL

54A-178

STEP 3. Check the wiring harness between radio and CD 
player connector D-06 (terminal 11) and the battery.
NOTE: Also check intermediate connector D-28. If intermediate 
connectors D-28 is damaged, repair or replace the connector 
as described in GROUP 00E, Harness Connector Inspection 

P.00E-2

.

Q: Is the wiring harness between radio and CD player 

connector D-06 (terminal 11) and the battery in good 
condition?
YES : Repair or replace the radio and CD player. Check that 

a memory is retained.

NO :  Repair the wiring harness. Check that a memory is 

retained.

INSPECTION PROCEDURE 20: CD can not be Inserted.

DIAGNOSIS

STEP1. 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 24 

P.54A-180

.) 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 24 

P.54A-180

.

NO : 

Go to Step 3.

STEP 3. Check after the CD is loaded.
NOTE: Even though the CD is loaded, "E" (error) is 
sometimes displayed with the CD rejected because 
of vibration/shock or dew on the CD face or optical 
lens.

Q: Though the CD is inserted completely, is "E" (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.

AC204188

CONNECTORS: D-06, D-28

D-28

D-06

BK

D-28

2 3

27

32

28

33

16

15

4 5

19

18

29

17

34

7 8

35

22

21

9 10

30

36

31

37

25

24

23

6

20

1

14

26

11

13

12

38

D-06

1
7

2
8

10

11

5

13

6

14

12

4

9

3

HARNESS SIDE