Mitsubishi Montero (2002-2004). Manual — part 498
RADIO WITH TAPE PLAYER AND CD PLAYER
TSB Revision
CHASSIS ELECTRICAL
54A-163
STEP 24. Check the wiring harness between tweeter (RH)
connector H-15 (terminals 1 and 2) and amplifier connector
G-19 (terminals 12 and 4).
NOTE: Also check intermediate connectors D-15 and D-124. If
intermediate connector D-15 or D-124 are damaged, repair or
replace the connector as described in GROUP 00E, Harness
Connector Inspection
.
Q: Is the wiring harness between tweeter (RH) connector
H-15 (terminals 1 and 2) and amplifier connector G-19
(terminals 12 and 4) in good condition?
YES : Go to Step 25.
NO : Repair the wiring harness. The tweeter (RH) should
sound.
AC204179
CONNECTOR : G-19
AV
HARNESS SIDE
3 2
1110
4
1312
1
9
5
6
1615
7
8
1817
14
AC204181
CONNECTOR : H-15
AI
HARNESS SIDE
1
2
AC204171
CONNECTOR : D-15
AB
10
9
31
30
20 21
7
6
28
17 18
8
19
29
4
3
25 26
14 15
1
23
12
2
13
24
5
16
27
11
22
32
AC204170
CONNECTOR : D-124
CW
3
9
2
8
6
5
7
4
1
RADIO WITH TAPE PLAYER AND CD PLAYER
TSB Revision
CHASSIS ELECTRICAL
54A-164
STEP 25. Replace the radio and CD player.
Q: Do the speakers sound?
YES : There is no action to be taken.
NO : Repair or replace the amplifier. The tweeter (RH)
should sound.
STEP 26. Check the woofer.
(1) Remove the woofer. Refer to
.
(2) Check that the woofer generates noise when a five-volt
voltage is applied on the woofer terminal.
Q: Is the woofer generating noise?
YES : Go to Step 27.
NO : Replace the woofer. The woofer should sound.
STEP 27. Check woofer connector G-01 and amplifier
connector G-19 for loose, corroded or damaged terminals,
or terminals pushed back in the connector.
Q: Are woofer connector G-01 and amplifier connector G-
19 in good condition?
YES : Go to Step 28.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
. The woofer should sound.
ACX01868AB
5V
AC204197
CONNECTORS : G-01, G-19
AE
G-19
HARNESS SIDE
G-19
HARNESS SIDE
G-01(B)
2
1
G-01(B)
3 2
1110
4
1312
1
9
5
6
1615
7
8
1817
14
RADIO WITH TAPE PLAYER AND CD PLAYER
TSB Revision
CHASSIS ELECTRICAL
54A-165
STEP 28. Check the wiring harness between woofer
connector G-01 (terminals 1 and 2) and amplifier connector
G-19 (terminals 8 and 18).
Q: Is the wiring harness between woofer connector G-01
(terminal 1 and 2) and amplifier connector G-19
(terminal 4 and 13) in good condition?
YES : Go to Step 29.
NO : Repair the wiring harness. The woofer should sound.
STEP 29. Replace the radio and CD player.
Q: Do the speakers sound?
YES : There is no action to be taken.
NO : Repair or replace the amplifier. The woofer should
sound.
INSPECTION PROCEDURE 5: Noise is Present while Moving (AM).
STEP 1. Ask the driver about 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: What type of noise is detected, vehicle noise or
external noise?
Vehicle noise :
It may not be possible to prevent
noise if the signal is weak. Go to step 2.
External noise :
In almost all cases, prevention on
the receiver side is next to impossible when
the signal is weak. Go to Step 4.
STEP 2. Ask the driver about the location where
the noise occurs
Q: Does the noise occur when entering or near a
particular structure (building, tunnel, mountain,
etc.)?
YES :
Go to Step 3.
NO :
Go to Step 4.
AC204197
CONNECTORS : G-01, G-19
AE
G-19
HARNESS SIDE
G-19
HARNESS SIDE
G-01(B)
2
1
G-01(B)
3 2
1110
4
1312
1
9
5
6
1615
7
8
1817
14
RADIO WITH TAPE PLAYER AND CD PLAYER
TSB Revision
CHASSIS ELECTRICAL
54A-166
STEP 3. Check if the noise can be eliminated by
adjusting the radio.
(1) Adjust the radio as follows.
(2) Change to a different station with a stronger
signal. This will boost the systems resistance to
outside interference.
(3) Suppress high tones to reduce noise.
Q: Has the noise been eliminated?
YES :
The noise has now been eliminated. Inform
the customer that it is normal to hear noise
while receiving a weak station.
NO :
Go to Step 4.
STEP 4. Check for the noise.
Q: Does noise still exist?
YES :
If there is still more noise than on other
similar radio’s find out the type of noise. Ask
the owner for the name and frequency of the
affected stations, and consult with the radio
manufacturer service center.
NO :
System is operating normally.
INSPECTION PROCEDURE 6: Noise is Present while Moving (FM).
.
DIAGNOSIS
NOTE: FM waves have the same properties as light,
and can be deflected and blocked. FM signal recep-
tion is severely degraded in the shadow of obstruc-
tions 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 (12 − 16 miles) for
stereo reception, and 30
− 40 km (19 − 25 miles)
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 consid-
ered.
8. If due to vehicle noise: It may not be possible to
prevent noise if the signal is weak.
ACX01869
10kW
OUTPUT FM
BROAD CAST
FOR STEREO:
20 - 25 km
(12 - 16 miles)
FOR MONAURAL:
30 - 40 km (19 - 25 miles)
FOR HOME STEREO:
80 - 90 km (50 - 56 miles)
MALTIPATH INTERFERENCE
FIRST FADING
INTERFERENCE
AC
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