Mitsubishi L200. Manual - part 746

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-351

Inspection Procedure 3: No sound is heard from one of the speakers. <Vehicles with audio amplifier>

CAUTION

Before replacing the multivision display or audio 
amplifier, ensure that the power supply circuit, 
the earth circuit, and the communication circuit 
are normal. (Check that the voltage is 10 V or 
more.)

TWEETER (LH)

TWEETER (RH)

FRONT DOOR 
SPEAKER (LH)

FRONT DOOR 
SPEAKER (RH)

Speaker System Circuit

AUDIO AMPLIFIER

REAR DOOR 
SPEAKER (RH)

REAR DOOR 
SPEAKER (LH)

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

NOTE

:LHD
:RHD

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-352

COMMENTS ON TROUBLE SYMPTOM
If the sound is not heard from one of the speakers, 
the speaker, multivision display, audio amplifier, com-
munication line from the multivision display to the 
audio amplifier, or communication line from the audio 
amplifier to the speaker may have a problem. 

PROBABLE CAUSES

• Malfunction of speaker

• Malfunctions of multivision display

• Malfunction of audio amplifier

• Damaged wiring harness and connectors

DIAGNOSIS PROCEDURE

STEP 1. Checking with speaker test
Perform the speaker test, and check which speaker 
does not output the sound. Refer to 

P.54A-305

.

NOTE: In the following procedure, check the speaker 
or tweeter  that is abnormal.

Q: Is the check result normal?

YES (normal for all) : 

The trouble can be an 

intermittent malfunction (Refer to GROUP 
00 

− How to Cope with Intermittent 

Malfunction ).

NO (Either a speaker, a tweeter is abnormal) : 

Go 

to Step 2.

AUDIO AMPLIFIER

MULTIVISION DISPLAY

Audio Amplifier 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-353

STEP 2. Connector check:  E-19 <LH>, E-11 <RH> 
front door speaker connector, E-22 <LH> or E-09 
<RH> rear door speaker connector, E-24 <LH>, E-
25 <RH> tweeter connector

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair the defective connector.

STEP 3. 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. <speaker 
or tweeter>

Q: Do the speaker or tweeter output the noise?

YES : 

Go to Step 4.

NO : 

Replace the speaker or tweeter.

STEP 4. Connector check: D-30 <tweeter> or D-
31 <front door speaker or rear door speaker> 
audio amplifier connector .

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the defective connector.

AC502334AB

Harness side

Connector: E-09

AC509954AR

Harness side

Connectors: E-11, E-25

E-11

E-11

Harness side

E-25

E-25

AC509952

Connectors: E-19, E-24

AS

Harness side

Harness side

E-19

E-24

E-24

E-19

AC502333AB

Connector: E-22

Harness side

AC903885AB

Connectors: D-30, D-31 <LHD>

D-30

Harness side

D-31

Harness side

D-30

D-31

AC903886 AB

Connectors: D-30, D-31 <RHD>

D-30

Harness side

D-31

Harness side

D-30

D-31

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-354

STEP 5. Check the wiring harness between the 
speaker or tweeter connector terminal and the 
audio amplifier connector terminal.
Check the communication lines for open circuit and 
short circuit.

•

<Front door speaker (LH)> Check the wire harness 

between E-19 front door speaker (LH) connector 
terminal No.1, 2 and D-31 audio amplifier con-
nector terminal No.8, 18.

NOTE: 

Prior to the wiring harness inspection, check interme-

diate connectors C-134 and C-58, and repair if 
necessary.

AC903885AC

Connector: D-31 <LHD>

Harness side

AC903886 AC

Connector: D-31 <RHD>

Harness side

AC509952

Connector: E-19

AB

Harness side

AC903853

Connector: C-58 <LHD>

AO

AC903868

Connector: C-58 <RHD>

AT

AC903856AG

Connector: C-134 <LHD>

Harness side

AC903865

Connector: C-134 <RHD>

AF