Mitsubishi Grandis. Manual — part 375

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-119

Step 16. Check the wiring harness between rear
door speaker (LH) connector F-03 (terminal 1 and
2) and radio and CD player connector C-20
(terminal 2 and 8).

NOTE:

Prior to the wiring harness inspection, check
intermediate connectors D-16 and C-16, and repair if
necessary.

Q: Is the wiring harness between rear door speaker

(LH) connector F-03 (terminal 1 and 2) and radio
and CD player connector C-20 (terminal 2 and 8) in
good condition?

YES :

Repair or replace the radio and CD player.

The rear door speaker (LH) should sound.

NO :

Repair or replace the damage
component(s). The rear door speaker (LH)
should sound.

Step 17. Check the rear door speaker (RH).
(1) Remove the rear door speaker (RH). Refer to

P.54A-139

.

(2) Check that the rear door speaker (RH) generates

noise when a five-volt voltage is applied on the
rear door speaker (RH) terminal.

Q: Is the rear door speaker (RH) generating noise?

AC310613

BF

Connector: C-20 <LHD>

Harness side

AC310632 BG

Connectors: C-16, C-20 <RHD>

C-16

C-16

C-20

C-20

Harness side

AC310209 AF

Connectors: F-03

Harness side

AC310615

AE

Connector: C-16 <LHD>

AC310207

AE

9

3

2

1
5 6 7 8

4

10

Connector: D-16

ACX01868

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-120

YES :

Go to Step 18.

NO :

Replace the rear door speaker (RH). The
rear door speaker (RH) should sound.

Step 18. Connector check: Rear door speaker
(RH) connector F-24 and radio and CD player
connector C-20.

Q: Are harness connectors F-24 and C-20 in good

condition?

YES :

Go to Step 19.

NO :

Repair or replace the damage
component(s). The rear door speaker (RH)
should sound.

AC310613

BF

Connector: C-20 <LHD>

Harness side

AC310631BB

Connector: C-20 <RHD>

Harness side

AC310216

AG

Connectors: F-24

Harness side

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-121

Step 19. Check the wiring harness between rear
door speaker (RH) connector F-24 (terminals 1
and 2) and radio and CD player connector C-20
(terminals 1 and 7).

NOTE:

Prior to the wiring harness inspection, check
intermediate connectors D-03, D-16, and repair if
necessary.

Q: Is the wiring harness between rear door speaker

(RH) connector F-24 (terminal 1 and 2) and radio
and CD player connector C-20 (terminal 1 and 7) in
good condition?

YES :

Repair or replace the radio and CD player.

The rear door speaker (RH) should sound.

NO :

Repair or replace the damage
component(s). The rear door speaker (RH)
should sound.

INSPECTION PROCEDURE 3: Noise Appears at Certain Places when Travelling (AM).

DIAGNOSIS PROCEDURE

Step 1. Check the noise occur when entering or
near a particular structure (building, tunnel,
mountain, etc).

Q: Dose the noise occur when entering or near a

particular structure (building, tunnel, mountain,
etc).?

YES :

Go to Step 3.

NO :

Go to Step 2.

AC310613

BF

Connector: C-20 <LHD>

Harness side

AC310631BB

Connector: C-20 <RHD>

Harness side

AC310216

AG

Connectors: F-24

Harness side

AC310633AC

Connector: D-03 <LHD>

D-03 (B)

9

3

2

1
5 6 7 8

4

10

AC310205

AC

D-03 (B)

9

3

2

1
5 6 7 8

4

10

Connector: D-03 <RHD>

AC310207

AE

9

3

2

1
5 6 7 8

4

10

Connector: D-16

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-122

Step 2. After taking the following measures to
prevent the noise, check that no noise appears.
(1) Change to a different station with a stronger wave

to boost resistance to interference.

(2) Suppress high tones to reduce noise.
(3) Extend antenna completely.

Q: Do the following measures eliminate the noise?

YES :

The following causes can be considered.

NO :

Go to Step 4.

Step 3. Ask the owner about the state of the
noise.
(1) Find out the following information from the owner.
(2) Place where the noise occurs.
(3) Locality conditions (valley, mountain, etc).
(4) Name and frequency of stations affected by noise

Q: Which is the noise, vehicle noise or external

noise?

Vehicle noise :

It may not be possible to prevent

noise if the signal is weak.

External noise :

In almost all cases, prevention on

the receiver side is impossible. Weak
signals especially are susceptible to
interference. Go to Step 4.

Step 4. Check that there is no noise.

Q: Does noise still exist?

YES :

If there is more noise than on radios in other

vehicles, find out the noise condition and
the name and frequency of the receiving
stations from the owner, and consult with
the radio manufacturer's service centre.

NO :

Normal.

INSPECTION PROCEDURE 4: Noise is Present while Moving (FM).

DIAGNOSIS PROCEDURE

NOTE: FM waves have the same properties as lamp,
and can be deflected and blocked. FM signal
reception is severely degraded in the shadow of
obstructions such as buildings or mountains. An FM
receiver will then only receive a reflected signal.
1. The signal becomes weak as the distance from

the station's transmission antenna increases. The
signal strength received depends on the signal
strength of the transmitting station and intervening
obstructions such as buildings and hills. Generally
speaking, the area of good reception is
approximately 20

− 25 km for stereo reception,

and 30

− 40 km for monaural reception.

2. The signal will becomes weak when an area of

shadow from the transmitting antenna (places
where there are obstructions such as mountains
or buildings between the station transmitter and
the vehicle), and noise will appear. <This is called
first fading, and gives a steady buzzing noise.>

3. If a direct signal hits the antenna at the same time

as a signal reflected by obstructions such as
mountains or buildings, interference of the two
signals will generate noise. When moving, noise
will appear each time the vehicle's antenna
passes through this kind of obstructed area. The
strength and interval of the noise varies according
to the signal strength and the conditions of
deflection. <This is called multipath noise, and is a
repetitive buzzing.>

4. Since FM stereo transmission and reception has a

weaker field than monaural, it is often
accompanied by a hissing noise.

After taking measures to prevent the noise, check
that no noise occurs.
5. Change to a different station with a stronger wave

to boost resistance to interference.

6. Suppress high tones to reduce noise.
7. Extend antenna completely.
If there is noise, the following causes can be
considered.

ACX01869

10kW
output FM
broad cast

For stereo:
20 - 25 km

For monaural:
30 - 40 km

For home stereos:
80 - 90 km

Multipath interference

First fading
interference

AC