Mitsubishi L200. Manual — part 740

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-327

Inspection Procedure 2: No sound is heard. <Vehicles without audio amplifier>

CAUTION

Whenever the multivision display is replaced,
ensure that the power supply circuit and the
earthing circuit are normal. (Check that the volt-
age is 10 V or more.)

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-328

COMMENTS ON TROUBLE SYMPTOM
If the sound is not output, the multivision display may
have a problem. In addition, if any of the speakers is
short-circuited, the protection circuit inside the multi-
vision display disables all the speakers to sound.
Therefore, if all the speakers do not output sound,

the speaker circuit may be shorted or the speaker
may be defective. In some cases, the sound is output
depending on sources, thus use the music server,
radio, CD/DVD, and others to check if the sound is
output.

NOTE

:LHD
:RHD

<DOUBLE CAB>

TWEETER (RH)

MULTIVISION DISPLAY

REAR DOOR
SPEAKER (LH)

REAR DOOR
SPEAKER (RH)

FRONT DOOR
SPEAKER (RH)

FRONT DOOR
SPEAKER (LH)

TWEETER (LH)

<VEHICLES WITH TWEETER>

<VEHICLES WITH TWEETER>

Speaker System Circuit

Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple SI : Silver

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-329

PROBABLE CAUSES

• Malfunction of multivision display

• Malfunction of speaker

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Check the multivision display operation.

Q: Check the sources from which the sound is not

output.
No sound only from radio :

Perform Inspection

Procedure 6 "The FM/MW/LM radio
broadcasting can not be received." (Refer to

P.54A-368

.)

No sound only when the CD is played :

Perform

Inspection Procedure 8 "CD/DVD cannot be
played." (Refer to

P.54A-371

.)

No sound only when the DVD is played :

Perform

Inspection Procedure 8 "CD/DVD cannot be
Played." (Refer to

P.54A-371

.) Or, perform

Inspection Procedure 9 "Image of a DVD is
Played, but no Sound is Played." (Refer to

P.54A-373

.)

No sound only when the music server is used :

Go

to Step 2.

No sound from any of the sources :

Go to Step 2.

STEP 2. Check the service data log for the MMCS
service mode.
(1) Display the service data log for the MMCS

service mode. (Refer to

P.54A-305

.)

(2) Check if the service data log for drive and HDD is

displayed.

Q: Is the service data log displayed?

YES (The service data log for drive is displayed.) :

Perform Inspection Procedure 8 "CD/DVD
cannot be Played." (Refer to

P.54A-371

.)

Or, perform Inspection Procedure 9 "Image
of a DVD is Played, but no Sound is
Played."(Refer to

P.54A-373

.) Go to Step 3.

YES (The service data log for HDD is displayed.) :

Abnormalities relating to high or low
temperature may be present. Check if the
multivision display can output the sound at
the operable temperature. If it cannot output
the sound, go to Step 3.

NO :

Go to Step 3.

STEP 3. Perform "Network/Connect Line Check"
in the MMCS service mode.
(1) Display "Network/Connect Line Check" in the

MMCS service mode. (Refer to

P.54A-305

.)

(2) Check if "DVD Drive OK" is displayed.
(3) Check if "HDD Drive OK" is displayed.

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Go to Step 8.

STEP 4. Check the following connectors.
Check the following connectors:

• E-19 front door speaker (LH) connector

• E-11 front door speaker (RH) connector

• E-24 tweeter (LH) connector

• E-25 tweeter (RH) connector

• E-22 rear door speaker (LH) connector <double

cab>

• E-09 rear door speaker (RH) connector <double

cab>

Q: Are all the connectors in good condition?

YES :

Go to Step 5.

NO :

Repair the defective connector.

STEP 5. Check the speaker or tweeter.
(1) Remove the speaker or tweeter. Refer to

P.54A-

445

.

(2) Check that the speaker or tweeter outputs the

noise when the voltage of 5 V is applied to the
speaker or tweeter connector terminal.

Q: Do the speaker or tweeter output the noise?

YES :

Go to Step 6.

NO :

Replace the speaker or tweeter.

STEP 6. Connector check: C-170 multivision
display connector.

Q: Is the check result normal?

YES :

Go to Step 7.

NO :

Repair the defective connector.

AC707572 AB

5 V

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-330

STEP 7. Check the wiring harness between the
speaker or tweeter connector terminal and the
multivision display connector terminal.
Check the communication lines for short circuit.

• <Front door speaker (LH) or tweeter (LH)> Check

the wiring harness between E-19 front door
speaker (LH) connector terminal No.1, 2 or E-24
tweeter (LH) connector terminal No.2, 1 and C-
170 multivision display connector terminal No.12,
3.

NOTE: Prior to the wiring harness inspection, check

intermediate connectors C-16, C-58, C-133 and
C-134, and repair if necessary.

• <Front door speaker (RH) or tweeter (RH)>

Check the wiring harness between E-11 front
door speaker (RH) connector terminal No.1, 2 or
E-25 tweeter (RH) connector terminal No.2, 1
and C-170 multivision display connector terminal
No.15, 7.

NOTE: Prior to the wiring harness inspection, check

intermediate connectors C-16, C-58, C-121 and
C-122, and repair if necessary.

• <Rear door speaker (LH)> Check the wiring har-

ness between E-22 rear door speaker (LH) con-
nector terminal No.1, 2 and C-170 multivision
display connector terminal No.11, 2.

NOTE: Prior to the wiring harness inspection, check

intermediate connectors C-59 and D-14, and
repair if necessary.

• <Rear door speaker (RH)> Check the wiring har-

ness between E-09 rear door speaker (RH) con-
nector terminal No.1, 2 and C-170 multivision
display connector terminal No.16, 8.

NOTE: Prior to the wiring harness inspection, check

intermediate connectors C-59 and D-24, and
repair if necessary.

Q: Is the check result normal?

YES :

Go to Step 8.

NO :

Repair the wiring harness.

STEP 8. Retest the system
Check if the sound is output from all the speakers.

Q: Is the check result normal?

YES :

The trouble can be an intermittent

malfunction (Refer to GROUP 00

− How to

use Troubleshooting/inspection Service
Points

− How to Cope with Intermittent

Malfunction ).

NO :

Replace the multivision display.