Mitsubishi Lancer (4A9 engine). Manual — part 180

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-382

YES (The service data log for drive is displayed.) :

Perform Inspection Procedure 8 "CD/DVD
cannot be Played." (Refer to .) Or, perform
Inspection Procedure 9 "Image of a DVD is
Played, but no Sound is Played."(Refer to .)
Go to Step 9.

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 9.

NO :

Go to Step 9.

STEP 9. Perform "Network/Connect Line Check"
in the MMCS service mode.
(1) Display "Network/Connect Line Check" in the

MMCS service mode. (Refer to )

(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 10.

NO :

Go to Step 14.

STEP 10. 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 11.

NO :

Repair the defective connector.

STEP 11. 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: Do the speaker or tweeter output the noise?

YES :

Go to Step 12.

NO :

Replace the speaker or tweeter.

STEP 12. Connector check: C-144 multivision
display connector

Q: Is the check result normal?

YES :

Go to Step 13.

NO :

Repair the defective connector.

STEP 13. 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), tweeter (LH)> Check

the wiring harness between E-12 front door
speaker (LH) connector terminal No.1, 2 or 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.

• <Front door speaker (RH), tweeter (RH)> Check

the wiring harness between E-10 front door
speaker (RH) connector terminal No.1, 2 or 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.

• <Rear door speaker (LH)> Check the wiring 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-28, C-139 and D-21,
and repair if necessary.

• <Rear door speaker (RH)> Check the wiring 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-16, C-139 and D-01,
and repair if necessary.

Q: Is the check result normal?

YES :

Go to Step 14.

NO :

Repair the wiring harness.

STEP 14. 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.

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-383

Inspection Procedure 2: No sound is heard. <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

Connectors: C-141, C-144 <LHD>

BI

C-141

C-144 (GR)

AC701122 CK

Connectors: C-141, C-144 <RHD>

C-141

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>

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-384

COMMENTS ON TROUBLE SYMPTOM
If the audio sound is not output, the multivision dis-
play, audio amplifier, or power supply circuit of audio
amplifier may have a problem. In addition, if any of
the speakers is short-circuited, the protection circuit
inside the multivision display disables all the speak-
ers 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. Also, the option coding informa-
tion may be inconsistent.
PROBABLE CAUSES

• Malfunctions of multivision display

• Malfunction of audio amplifier

• Malfunction of speaker or tweeter

• Option coding information inconsistency

• Damaged wiring harness 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
.)

No sound only when the CD is played :

Perform

Inspection Procedure 8 "CD/DVD cannot be
played." (Refer to .)

No sound only when the DVD is played :

Perform

Inspection Procedure 8 "CD/DVD cannot be
Played." (Refer to .) Or, perform Inspection
Procedure 9 "Image of a DVD is Played, but
no Sound is Played."(Refer to .)

Only the sound that is relevant to the hands free
function and USB adapter function is not output.
<Vehicles with hands free ECU> :

Diagnose the

hands free ECU. (Refer to .)

Only the sound relevant to USB adapter is not
output. <Vehicles with USB box> :

Troubleshoot

the USB box. (Refer to .)

No sound only when the music server is used :

Go

to Step 8.

No sound from any of the sources <except
vehicles for RUSSIA> :

Go to Step 8.

No sound from any of the sources <vehicles for
RUSSIA> :

Go to Step 2.

STEP 2. 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 Table ).

(2) Check that the "Number of speaker" is set to

"Premium".

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

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

STEP 3. 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 "PREMIUM" is displayed as the number

of installed speakers.

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Go to Step 5.

AC701264 AR

Connector: F-25 <LANCER>

F-25 (B)

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-385

STEP 4. 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 5.

NO :

Go to Step 8.

STEP 5. 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 6.

NO :

Repair the CAN bus line.

STEP 6. Check whether the diagnosis code is set.
Check if the diagnosis code is set to the CAN box
unit.
(1) Turn the ignition switch from "LOCK" (OFF)

position to "ON" position.

(2) Check if diagnosis code is set.

Q: Is the diagnosis code set?

YES :

Troubleshoot the MMCS (Refer to ).

NO :

Go to Step 7.

STEP 7. 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 8.

STEP 8. Check the service data log for the MMCS
service mode.
(1) Display the service data log for the MMCS

service mode. (Refer to )

(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 .) Or, perform
Inspection Procedure 9 "Image of a DVD is
Played, but no Sound is Played."(Refer to .)
Go to Step 9.

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 9.

YES (The service data log for AMP is displayed.) :

Go to Step 9.

NO :

Go to Step 9.

STEP 9. Perform "Network/Connect Line Check"
in the MMCS service mode.
(1) Display "Network/Connect Line Check" in the

MMCS service mode. (Refer to )

(2) Check if "DVD Drive OK" is displayed.
(3) Check if "HDD Drive OK" is displayed.
(4) Check if "Premium Audio OK" is displayed.

Q: Is the check result normal?

YES :

Go to Step 10.

NO :

Go to Step 21.

STEP 10. Connector check: D-26, D-27 audio
amplifier connector

Q: Is the check result normal?

YES :

Go to Step 11.

NO :

Repair the defective connector.

STEP 11. Resistance measurement at D-26 audio
amplifier connector
(1) Disconnect the connector, and measure at the

wiring harness side.

(2) Measure the resistance between D-26 audio

amplifier connector terminal No.24 and the body
earth.

OK: Continuity exists (2

Ω or less)

(3) Measure the resistance between D-26 audio

amplifier connector terminal No.31 and the body
earth.

OK: Continuity exists (2

Ω or less)

(4) Measure the resistance between D-26 audio

amplifier connector terminal No.32 and the body
earth.

OK: Continuity exists (2

Ω or less)

Q: Is the check result normal?