Mitsubishi Lancer (4A9 engine). Manual — part 186

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-406

DIAGNOSIS PROCEDURE

STEP 1. Confirmation in MMCS service mode
Check the items below in the MMCS service mode
(Refer to ).

• Perform "Network/Connect Line Check" in the

MMCS service mode to check that the communi-
cation and wire connection with the GPS are in
good condition.

• Perform "Vehicle Signal Check", and then check

the status of the vehicle speed signal.

• Perform "Sensor Check", and then check the

status of the vehicle speed sensor and the gyro
sensor.

Q: Is the check result normal?

YES (OK for all) :

Go to Step 6.

NO <GPS is not OK> :

Go to Step 2.

NO <The vehicle speed sensor is not OK, or vehicle
speed pulse does not increase after starting from a
standstill> :

Go to Step 3.

NO <Gyro sensor is not OK> :

Go to Step 6.

STEP 2. GPS reception check
(1) Start the multivision display.

(2) Press the (1).

(3) Select (2).

(4) Wait for 5 minutes, and then check whether GPS

signal can be received.

Q: Is the check result normal?

YES :

Go to Step 6.

NO :

Perform Inspection Procedure 7 "GPS
signal cannot be received" (Refer to .), and
then go to Step 6.

STEP 3. Check the speedometer.
Check whether the speedometer works normally.
(Refer to .)

Q: Does the speedometer work normally?

YES :

Go to Step 4.

NO :

Diagnose the combination meter (Refer to
Combination meter

− Troubleshooting ).

AC804201

(1)

AB

AC803907

AB

(2)

AC803908

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-407

STEP 4. Connector check: C-01 combination
meter connector, 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 harness wire between C-01
combination meter connector terminal No.20 and
C-144 multivision display connector terminal
No.13.

• Check the signal line for open and short circuit.

NOTE: Prior to the wiring harness inspection, check
intermediate connector C-139, and repair if neces-
sary.

Q: Is the check result normal?

YES :

Go to Step 6.

NO :

Repair the wiring harness.

STEP 6. Check of the troubles
Drive the vehicle for some time with the GPS signals
being received, and check if the own vehicle mark is
dislocated.

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-408

Inspection Procedure 6: The FM/MW/LM radio broadcasting can not be received.

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
In case of FM/MW/LW radio broadcasting can not be
received., the roof antenna (antenna rod, antenna
base), antenna fender or multivision display may
have a problem.

ROOF ANTENNA

ANTENNA

FEEDER CABLE

ANTENNA AMPLIFIER

Antenna Circuit

MULTIVISION DISPLAY

Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple SI : Silver

AC801696

Connectors: C-09, C-141 <LHD>

AG

C-09

C-141

AC801699AH

Connectors: C-09, C-141 <RHD>

C-09

C-141

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-409

NOTE: The radio wave may not be received if the
vehicle is placed in the area which is exposed to a
special electric field. Thus, check that the radio
broadcasting can be received using the radio of
another vehicle before carrying out diagnosis.

PROBABLE CAUSES

• Malfunction of roof antenna (antenna rod,

antenna base)

• Antenna feeder malfunction

• Malfunctions of multivision display

DIAGNOSIS PROCEDURE

STEP 1. Check the state of the roof antenna.

Q: Is the roof antenna assembled?

YES :

Go to Step 2.

NO :

Assemble the antenna.

STEP 2. Check to see if inspections are taking
place is an area exposed to special electric
fields.

Q: Is the reception area exposed to special electric

fields?
YES :

Go to Step 3.

NO :

Go to Step 4.

STEP 3. Move the vehicle and check the radio.
Move the vehicle to a good reception area that is not
exposed to special electric fields.

Q: Is the check result normal?

YES :

Diagnosis complete.

NO :

Go to Step 4.

STEP 4. Check damage in the roof antenna (the
antenna rod, the antenna base).

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Replace antenna rod or antenna base.

STEP 5. Check the connection of the antenna
plug and multivision display.

Q: Is the check result normal?

YES :

Go to Step 6.

NO :

Thoroughly connect the antenna plug and
the multivision display.

STEP 6. Connector check: C-141 multivision
display connector, C-09 antenna amplifier
(antenna base) connector

Q: Is the check result normal?

YES :

Go to Step 7.

NO :

Repair or replace the damaged connector.

STEP 7. Check the antenna feeder between C-141
multivision display connector terminal No.81 and
C-09 antenna amplifier (antenna base) connector
terminal No.2.

• Check the signal line for open circuit and short

circuit.

NOTE: Prior to the wiring harness inspection, inter-
mediate connector C-139, and repair if necessary.

Q: Is the check result normal?

YES :

Go to Step 8.

NO :

Repair the antenna feeder.

STEP 8. Substitute a known good multivision
display, and check the trouble symptom.

Q: Is the check result normal?

YES :

Replace the multivision display.

NO :

Either repair or replace the roof antenna
assembly.

Inspection Procedure 7: GPS signal can not be received. <Except vehicles for RUSSIA>

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
The GPS antenna or the multivision display may be
defective.

PROBABLE CAUSES

• Malfunctions of GPS antenna

• Malfunctions of multivision display