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.