Mitsubishi Lancer (4A9 engine). Manual - part 183

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-394

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 harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Checking with audio speaker check
Perform the audio speaker check, and check which 
speaker does not output the sound (Refer to ).
NOTE: In the following procedure, check the 
speaker, tweeter or subwoofer 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 use Troubleshooting/inspection 

Service Points 

− How to Cope with 

Intermittent Malfunction ).

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

Go to Step 2.

STEP 2. Check the following connectors.
Check the following connectors:

• E-12 front door speaker (LH) connector

• E-10 front door speaker (RH) connector

• E-22 rear door speaker (LH) connector

• E-21 rear door speaker (RH) connector

• E-02 tweeter (LH) connector

• E-04 tweeter (RH) connector

• F-25 sub woofer connector

Q: Are all the connectors in good condition?

YES : 

Go to Step 3.

NO : 

Repair the defective connector.

STEP 3. Check the speaker, tweeter or 
subwoofer.
(1) Remove the speaker, tweeter or subwoofer. 

Refer to .

(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>

(3) Check that the subwoofer outputs the noise when 

the voltage of 5 V is applied to the subwoofer 
connector terminal. <subwoofer>

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Replace the speaker, tweeter or subwoofer.

STEP 4. Connector check: D-26 <front door 
speaker or sub woofer>, D-27 <tweeter or rear 
door speaker> audio amplifier connector

Q: Is the check result normal?

AC612733

Connector: E-21

AB

AC612732

Connector: E-22

AB

AC801775 BJ

F-25 (B)

Connector: F-25 <LANCER SPORTBACK>

AC701264 AR

Connector: F-25 <LANCER>

F-25 (B)

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-395

YES : 

Go to Step 5.

NO : 

Repair the defective connector.

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-396

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

• <Front door speaker (LH)> Check the wire har-

ness between E-12 front door speaker (LH) con-
nector terminal No.1, 2 and D-26 audio amplifier 
connector terminal No.28, 38.

NOTE: Prior to the wiring harness inspection, check 

intermediate connectors C-17 and C-126, and 
repair if necessary.

• <Front door speaker (RH)> Check the wire har-

ness between E-10 front door speaker (RH) con-
nector terminal No.1, 2 and D-26 audio amplifier 
connector terminal No.27, 37.

NOTE: Prior to the wiring harness inspection, check 

intermediate connectors C-17 and C-112, and 
repair if necessary.

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

ness between E-22 rear door speaker (LH) con-
nector terminal No.1, 2 and D-27 audio amplifier 
connector terminal No.1, 7.

NOTE: Prior to the wiring harness inspection, check 

intermediate connector D-21, and repair if neces-
sary.

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

ness between E-21 rear door speaker (RH) con-
nector terminal No.1, 2 and D-27 audio amplifier 
connector terminal No.2, 8.

NOTE: Prior to the wiring harness inspection, check 

intermediate connector D-01, and repair if neces-
sary.

• <Tweeter (LH)> Check the wire harness between 

E-02 tweeter (LH) connector terminal No.1, 2 and 
D-27 audio amplifier connector terminal No.14, 6.

NOTE: Prior to the wiring harness inspection, check 

intermediate connectors C-17 and C-126, and 
repair if necessary.

• <Tweeter (RH)> Check the wire harness between 

E-04 tweeter (RH) connector terminal No.1, 2 
and D-27 audio amplifier connector terminal 
No.13, 5.

NOTE: Prior to the wiring harness inspection, check 

intermediate connectors C-17 and C-112, and 
repair if necessary.

• <Subwoofer> Check the wire harness between F-

25 subwoofer connector terminal No.1, 2, 3, 4 
and D-26 audio amplifier connector terminal 
No.30, 22, 29, 21.

NOTE: Prior to the wiring harness inspection, check 

intermediate connector D-17, and repair if neces-

sary.

Q: Is the check result normal?

YES <front door speaker> : 

Go to Step 6.

YES <except front door speaker> : 

Go to Step 8.

NO (harness wire is abnormal) : 

Repair the wiring 

harness.

STEP 6. Connector check: C-144 multivision 
display connector

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair the defective connector.

STEP 7. Check the harness wire between C-144 
multivision display connector terminal No.3, 7, 
12, 15 and D-27 audio amplifier connector No.12, 
11, 4, 10.

• Check the communication lines for open circuit or 

short circuit.

NOTE: Prior to the wiring harness inspection, check 
intermediate connectors C-139 and C-17, and repair 
if necessary.

Q: Is the check result normal?

YES : 

Check the trouble symptom, go to Step 8.

NO : 

Repair the wiring harness.

STEP 8. Replace the multivision display 
temporarily, and check the trouble symptom.
Replace the multivision display temporarily, and 
check that the sound is output from the speaker.

Q: Is the check result normal?

YES : 

Replace the multivision display.

NO : 

Replace the audio amplifier..

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-397

Inspection Procedure 3: Not sound is heard from one of the speakers. <Vehicles for RUSSIA (vehicles 
with 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.)

AC701094

Connector: C-144 <LHD>

BJ

C-144 (GR)

AC701122 CL

Connector: C-144 <RHD>

C-144 (GR)

AC612722

BI

Connectors: D-26, D-27

D-26

D-27

AC612730

Connectors: E-02, E-12

AD

E-02 (B)

E-12

AC612731

Connectors: E-04, E-10

AD

E-04 (B)

E-10

AC612733

Connector: E-21

AB

AC612732

Connector: E-22

AB

AC801775 BJ

F-25 (B)

Connector: F-25 <LANCER SPORTBACK>