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.