Mitsubishi Lancer (4A9 engine). Manual - part 181

 

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Mitsubishi Lancer (4A9 engine). Manual - part 181

 

 

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-386

YES : 

Go to Step 13.

NO : 

Go to Step 12.

STEP 12. Check the wiring harness between the 
D-26 audio amplifier connector terminal No.24, 
31, 32 and the body earth

• Check the earth wires for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 13.

NO : 

Repair the wiring harness.

STEP 13. Voltage measurement at D-26 audio 
amplifier connector
(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Voltage between D-26 audio amplifier connector 

terminal No.25 and the body earth

OK: System voltage

(3) Voltage between D-26 audio amplifier connector 

terminal No.35 and the body earth

OK: System voltage

(4) Voltage between D-26 audio amplifier connector 

terminal No.36 and the body earth

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 15.

NO : 

Go to Step 14.

STEP 14. Check the wiring harness between D-26 
audio amplifier connector terminal No.25, 35, 36 
and fusible link No.36 <petrol> or 38 <diesel>.

• Check the power supply lines for open circuit and 

short circuit.

NOTE: Prior to the wiring harness inspection, check 
intermediate connector C-31, and repair if necessary.

Q: Is the check result normal?

YES : 

Go to Step 15.

NO : 

Repair the wiring harness.

STEP 15. Connector check: C-141, C-144 
multivision display connector

Q: Is the check result normal?

YES : 

Go to Step 16.

NO : 

Repair the defective connector.

STEP 16. Check the wiring harness between C-
144 multivision display connector terminal No.6 
or C-141 multivision display connector terminal 
No.82 and D-26 audio amplifier connector No.34 
or D-27 audio amplifier connector No.3.

• Check the communication line for open circuit 

and short circuit.

NOTE: Prior to the wiring harness inspection, check 
intermediate connectors C-17 and C-140, and repair 
if necessary.

Q: Is the check result normal?

YES : 

Go to Step 17.

NO : 

Repair the wiring harness.

STEP 17. 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 18.

NO : 

Repair the defective connector.

STEP 18. 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: Do the speaker, tweeter or subwoofer output the 

noise?
YES : 

Go to Step 19.

NO : 

Replace the speaker, tweeter or subwoofer.

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-387

STEP 19. Check the wiring harness between the 
speaker, tweeter or subwoofer connector 
terminal and the audio amplifier connector 
terminal.
Check the communication lines for short circuit.

• <Front door speaker (LH)> Check the wiring 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 wiring 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 wiring 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 wiring 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 wiring harness 

between E-02 tweeter (LH) connector terminal 
No.1, 2 and D-27 audio amplifier connector termi-
nal 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 wiring harness 

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

NOTE: Prior to the wiring harness inspection, check 

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

• <Sub woofer> Check the wiring harness between 

E-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 : 

Go to Step 20.

NO : 

Repair the wiring harness.

STEP 20. Check the wiring harness 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 short circuit.

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

Q: Is the check result normal?

YES : 

Go to Step 21.

NO : 

Repair the wiring harness.

STEP 21. 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 : 

Go to Step 22.

STEP 22. Replace the audio amplifier temporarily, 
and check the trouble symptom.
Replace the audio amplifier temporarily, and check 
that the sound is output from all the speakers.

Q: Is the check result normal?

YES : 

Replace the audio amplifier.

NO : 

Replace the multivision display.

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-388

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

COMMENTS ON TROUBLE SYMPTOM
If the sound is not heard from one of the speakers or 
tweeters, the speaker, tweeter, multivision display or 
communication line from the multivision display to 
the speaker may have a problem.

PROBABLE CAUSES

• Malfunction of speaker or tweeter

• Malfunction of multivision display

• 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 
or tweeter that is abnormal.

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 (Either a speaker is abnormal) : 

Go to Step 2.

AC701094

Connector: C-144 <LHD>

BJ

C-144 (GR)

AC701122 CL

Connector: C-144 <RHD>

C-144 (GR)

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

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-389

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 <vehicles with 6-

speaker>

• E-04 tweeter (RH) connector <vehicles with 6-

speaker>

Q: Are all the connectors in good condition?

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 ).
(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: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Replace the speaker or tweeter.

STEP 4. Connector check: C-144 multivision 
display connector.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the defective connector.

STEP 5. Check the wire harness between the 
speaker or tweeter connector terminal and the 
multivision display 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 C-144 multivision 
display connector terminal No.12, 3.

NOTE: Prior to the wiring harness inspection, check 

intermediate connectors C-126 and C-139, 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 C-144 multivision 
display connector terminal No.15, 7.

NOTE: Prior to the wiring harness inspection, check 

intermediate connectors C-112 and C-139, 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 C-144 multivision 
display connector terminal No.11, 2.

NOTE: Prior to the wiring harness inspection, check 

intermediate connectors C-139, C-28, D-21, and 
repair if necessary.

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

ness between E-21 rear door speaker (RH) con-
nector terminal No.1, 2 and C-144 multivision 
display connector terminal No.16, 8.

NOTE: Prior to the wiring harness inspection, check 

intermediate connectors C-139, C-16, D-01, and 
repair if necessary.

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

E-02 tweeter (LH) connector terminal No.2, 1 and 
C-144 multivision display connector terminal 
No.12, 3.

NOTE: Prior to the wiring harness inspection, check 

intermediate connectors C-126 and C-139, and 
repair if necessary.

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

E-04 tweeter (RH) connector terminal No.2, 1 
and C-144 multivision display connector terminal 
No.15, 7.

NOTE: Prior to the wiring harness inspection, check 

intermediate connectors C-112 and C-139, and 
repair if necessary.

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the wiring harness.

 

 

 

 

 

 

 

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