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

 

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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

 

 

 

 

 

 

 

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