Mitsubishi Lancer (4A9 engine). Manual — part 202

HANDS FREE ECU

CHASSIS ELECTRICAL

54A-470

COMMENTS ON TROUBLE SYMPTOM
If the voice information is not sent when the speech
switch is pushed, the communication between the
multivision display, and the hands free module, or the
communication between the multivision display, and
the steering wheel voice control switch, the hands
free module, or the steering wheel voice control
switch may have a problem.

PROBABLE CAUSES

• The multivision display may be defective.

• The hands free ECU may be defective.

• The steering wheel audio remote control switch

may be defective.

• The steering wheel voice control switch may be

defective.

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Check the multivision display operation.
Display the INFOR screen, and check that the
"Mobile Phone" item is displayed.

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Perform Inspection Procedure 6:
"DIAGNOSIS MODE cannot be made an
entry. Mobile Phone item is not displayed on
the INFOR screen of MMCS." of the
troubleshooting (Refer to ).

STEP 2. Operation check of the steering wheel
audio remote control switch
Check that the multivision display can be operated
by the steering wheel audio remote control switch.

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Troubleshoot the steering wheel audio
remote control switch. (Refer to .)

STEP 3. Check the steering wheel voice control
switch.
Check the continuity of the steering wheel voice con-
trol switch. (Refer to steering wheel voice control
switch inspection. )

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Replace the steering wheel voice control
switch.

STEP 4. Check the steering wheel audio remote
control switch.
Check the continuity of the steering wheel audio
remote control switch. (Refer to steering wheel audio
remote control switch inspection. )

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Replace the steering wheel audio remote
control switch.

STEP 5. Check the harness wire between C-202
steering wheel audio remote control switch
connector terminal No. 3 and C-209 steering
wheel voice control switch connector terminal
No.3

• Check the communication lines for open circuit

and short circuit.

Q: Is the check result normal?

YES :

Go to Step 6.

NO :

Repair the wiring harness.

STEP 6. Connector check: C-204 clock spring
connector.

Q: Is the check result normal?

YES :

Go to Step 7.

NO :

Repair the defective connector.

AC612708 AR

Connectors: C-202, C-204, C-209 <LHD>

C-202 (R)

C-204

C-209 (Y)

AC612716 AI

Connectors: C-202, C-204, C-209 <RHD>

C-202 (R)

C-204

C-209 (Y)

HANDS FREE ECU

CHASSIS ELECTRICAL

54A-471

STEP 7. Check the harness wire between C-204
clock spring connector terminal No. 4 and C-209
steering wheel voice control switch connector
terminal No.2.

• Check the communication lines for open circuit

and short circuit.

Q: Is the check result normal?

YES :

Go to Step 8.

NO :

Repair the wiring harness.

STEP 8. Temporarily replace the hands free ECU,
and check the trouble symptom.

Q: Is the check result normal?

YES :

Replace the hands free ECU.

NO :

Replace the multivision display.

Inspection Procedure 5: DIAGNOSIS MODE cannot be made an entry. <Vehicles with radio and CD
player>

CAUTION

Before replacing the hands free ECU, ensure that the power supply circuit, the earth circuit and the
communication circuit are normal.

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

Hands Free ECU Communication Circuit

HANDS FREE ECU

RADIO AND CD PLAYER

ACA00892

Connectors: C-41, C-105 <LHD>

AL

C-105

C-41

ACA00896

AD

Connector: C-41 <RHD>

HANDS FREE ECU

CHASSIS ELECTRICAL

54A-472

COMMENTS ON TROUBLE SYMPTOM
If the diagnosis mode cannot be made an entry, the
hands free ECU, the communication between the
hands free ECU, and the radio and CD player, or the
power supply system of hands free ECU may have a
problem.

PROBABLE CAUSES

• The hands free ECU may be defective.

• The radio and CD player may be defective.

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Check the radio and CD player
operation.
Check if the radio and CD player work normally and
the sound is output.

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Troubleshoot the radio and CD player.
(Refer to .)

STEP 2. Connector check: C-41 hands free ECU
connector, C-105 radio and CD player connector

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Repair the defective connector.

STEP 3. Check the wiring harness between C-41
hands free ECU connector terminal No.2, 16 and
C-105 radio and CD player connector terminal
No.1, 10.

• Check the signal lines for open circuit and short

circuit.

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Repair the wiring harness.

STEP 4. Check if the power supply circuit of
hands free ECU have a problem.
Perform the Inspection procedure 1 "Check the
hands free-ECU power supply circuit." of the trouble-
shooting. (Refer to )

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Repair according to the troubleshooting for
reference.

STEP 5. Replace the hands free ECU temporarily,
and check the trouble symptom.

Q: Is the check result normal?

YES :

Replace the hands free ECU.

NO :

Replace the radio and CD player.

ACA00895AM

Connector: C-105 <RHD>

C-105

HANDS FREE ECU

CHASSIS ELECTRICAL

54A-473

Inspection Procedure 6: DIAGNOSIS MODE cannot be made an entry. Mobile Phone item is not
displayed on the INFOR screen of MMCS. <Vehicles with MMCS>

CAUTION

Before replacing the hands free ECU, ensure that the power supply circuit, the earth circuit and the
communication circuit are normal.

COMMENTS ON TROUBLE SYMPTOM
If the diagnosis mode cannot be made an entry, the
hands free ECU, the communication between the
hands free ECU, and the multivision display, or the
power supply system of hands free ECU may have a
problem.

PROBABLE CAUSES

• The hands free ECU may be defective.

• The multivision display may be defective.

• Damaged harness wires and connectors

Hands Free ECU Communication Circuit

HANDS FREE ECU

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

ACA00892

Connectors: C-141 <LHD>

AO

C-141

C-41

ACA00896

AD

Connector: C-41 <RHD>

ACA00895AO

Connector: C-141 <RHD>

C-141