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>
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