Mitsubishi Lancer (4A9 engine). Manual - part 182

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-390

STEP 6. Check of the troubles
Check if the sound is output from all the speakers 
normally.

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 7.

STEP 7. Check of the troubles
Temporarily replace the multivision display, and 
check if the sound is output.

Q: Is the check result normal?

YES : 

Replace the multivision display.

NO : 

Replace the faulty speaker or tweeter.

Inspection Procedure 3: Not sound is heard from one of the speakers. <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.)

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

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-391

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. Also, the option 
coding information may be inconsistent.

PROBABLE CAUSES

• Malfunction of speaker or tweeter

• Malfunction of multivision display

• Option coding information inconsistency

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. ETACS-ECU coding data check
(1) Operate the M.U.T.-III to read the ETACS-ECU 

option coding information (Refer to GROUP 00 

− 

Coding List ).

(2) Check that the result matches with the number of 

speakers ("6 speakers" or "4 speakers") specified 
by "Number of speaker."

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Operate the M.U.T.-III to set the option 
coding "Number of speaker" to "6 speakers" 
or "4 speakers", and check the trouble 
symptom.

STEP 2. Check the MMCS service mode, CAN 
communication confirmation and coding data
(1) Display the CAN communication confirmation 

and coding data for the MMCS service mode. 
(Refer to .)

(2) Check if "6SPEAKER(2TWEETER) or 

4SPEAKER" is displayed as the number of 
installed speakers.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Go to Step 4.

STEP 3. Check the service data log for the MMCS 
service mode.
Display the service data log for the MMCS service 
mode and check if the service data log for the SP 
(speaker) is displayed. (Refer to .)

Q: Is the service data log for the SP (speaker) 

displayed?
YES : 

Go to Step 4.

NO : 

Go to Step 7.

STEP 4. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the CAN bus line.

STEP 5. Check whether the diagnosis code is set.
Check if the diagnosis code is set to the CAN box 
unit.
(1) Erase the diagnosis code.
(2) Turn the ignition switch from "LOCK" (OFF) 

position to "ON" position.

(3) Check if diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Troubleshoot the MMCS (Refer to ).

NO : 

Go to Step 6.

STEP 6. M.U.T.-III other system diagnosis code
Check if the diagnosis code is set to the ETACS-
ECU.

Q: Is the diagnosis code set?

YES : 

Diagnose the ETACS-ECU (Refer to 

GROUP 54A 

− ETACS-ECU − 

Troubleshooting ).

NO : 

Go to Step 7.

STEP 7. 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 8.

AC612732

Connector: E-22

AB

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-392

STEP 8. 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 9.

NO : 

Repair the defective connector.

STEP 9. 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 10.

NO : 

Replace the speaker or tweeter.

STEP 10. Connector check: C-144 multivision 
display connector.

Q: Is the check result normal?

YES : 

Go to Step 11.

NO : 

Repair the defective connector.

STEP 11. 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 12.

NO : 

Repair the wiring harness.

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-393

STEP 12. Check of the troubles
Check if the sound is output from all the speakers 
normally.

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 13.

STEP 13. Check of the troubles
Temporarily replace the multivision display, and 
check if the sound is output.

Q: Is the check result normal?

YES : 

Replace the multivision display.

NO : 

Replace the faulty speaker or tweeter.

Inspection Procedure 3: Not sound is heard from one of the speakers. <Except 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