Mitsubishi Lancer (4A9 engine). Manual - part 201

HANDS FREE ECU

CHASSIS ELECTRICAL

54A-466

Inspection Procedure 4: When the speech switch is pressed, the voice information is not output. 
<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.

Steering Wheel Voice Control Switch Circuit

RADIO AND CD PLAYER

CLOCK 
SPRING

STEERING
WHEEL
AUDIO
REMOTE
CONTROL
SWITCH

STEERING 
WHEEL
VOICE 
CONTROL 
SWITCH

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

CHASSIS ELECTRICAL

54A-467

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

PROBABLE CAUSES

• The radio and CD player 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 diagnosis mode
Check if the hands free ECU can be switched to the 
diagnosis mode.(Refer to .)

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Perform Inspection Procedure 5 
"DIAGNOSIS MODE cannot be made an 
entry."(Refer to .)

STEP 2. Operation check of the steering wheel 
audio remote control switch
Check that the radio and CD player 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.

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-304 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-468

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 radio and CD player.

HANDS FREE ECU

CHASSIS ELECTRICAL

54A-469

Inspection Procedure 4: When the speech switch is pressed, the voice information is not output. 
<Vehicles with MMCS>

CAUTION

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

Steering Wheel Voice Control Switch Circuit

CLOCK 
SPRING

STEERING
WHEEL 
AUDIO
REMOTE
CONTROL
SWITCH

STEERING 
WHEEL 
VOICE 
CONTROL 
SWITCH

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

MULTIVISION DISPLAY