Mitsubishi L200. Manual - part 762

HANDS FREE-ECU

CHASSIS ELECTRICAL

54A-415

STEP 4. Connector check: C-173 hands free ECU 
connector, C-126 radio and CD player connector

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the defective connector.

STEP 5. Check the wiring harness between C-173 
hands free ECU connector terminal No.8, 22, 23 
and C-126 radio and CD player connector 
terminal No. 24, 23, 34.

• Check the signal 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. Replace the hands free ECU temporarily, 
and check the trouble symptom.
Replace the hands free ECU temporarily, and check 
that the sound is output from the speaker.

Q: Is the check result normal?

YES : 

Replace the hands free ECU.

NO : 

Replace the radio and CD player.

Inspection Procedure 2: The USB memory device data cannot be replayed.  <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 sound replay is impossible with the USB/i Pod 
mode, the USB adapter, USB cable, hands free 
ECU, or multivision display may be defective, or a 
communication error between the multivision display 
and hands free ECU may have occurred.

NOTE: Before troubleshooting, check that the music 
file (the customer tried to replay) can be replayed.

PROBABLE CAUSES

• The multivision display may be defective.

• The hands free ECU may be defective.

• The USB cable may be defective.

• Damaged harness wires and connectors

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

USB 
CONNECTOR

MULTIVISION DISPLAY

USB CABLE

HANDS FREE-ECU

CHASSIS ELECTRICAL

54A-416

DIAGNOSIS PROCEDURE

STEP 1. Check the multivision display operation.
Check if the multivision display work normally and 
the sound is output.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Troubleshoot the MMCS (Refer to 

P.54A-

314

.).

STEP 2. Check the diagnosis mode
Check if the hands free ECU can be switched to the 
diagnosis mode. (Refer to 

P.54A-406

.)

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

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

P.54A-421

.)

STEP 3. Check the USB cable.
Check that the USB cable is connected to the hands 
free ECU normally. Or check the USB cable for dam-
age such as bend.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Replace or repair the USB cable.

STEP 4. Connector check: C-173 hands free ECU 
connector, C-167 multivision display connector

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the defective connector.

STEP 5. Check the wiring harness between C-173 
hands free ECU connector terminal No.8, 22, 23 
and C-167 multivision display connector terminal 
No. 51, 35, 36.

• Check the signal 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. Replace the hands free ECU temporarily, 
and check the trouble symptom.
Replace the hands free ECU temporarily, and check 
that the sound is output from the speaker.

Q: Is the check result normal?

YES : 

Replace the hands free ECU.

NO : 

Replace the multivision display.

HANDS FREE-ECU

CHASSIS ELECTRICAL

54A-417

Inspection Procedure 3: When the speech switch is pressed, the voice information is output, but the 
voice recognition is not performed.

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
When the speech switch is pushed, if the voice infor-
mation is output but voice recognition is not exe-
cuted, the microphone unit, hands free ECU or the 
communication between the microphone unit and the 
hands free ECU may have a problem.

PROBABLE CAUSES

• The hands free ECU may be defective.

• The microphone unit may be defective.

• Damaged harness wires and connectors

HANDS-FREE ECU

Microphone Unit Circuit

MICROPHONE 
UNIT

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

<RHD>

HANDS FREE-ECU

CHASSIS ELECTRICAL

54A-418

DIAGNOSIS PROCEDURE

STEP 1. Check the diagnosis mode
Check if the microphone check result "MIC OK" is 
displayed on the diagnosis mode of hands free ECU. 
(Refer to 

P.54A-403

 <Using radio and CD player> or 

P.54A-406

 <Using multivision display>.)

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Go to Step 2.

STEP 2. Connector check: D-41 microphone unit 
connector, C-173 hands free ECU

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair the defective connector.

STEP 3. Check the wiring harness between C-173 
hands free ECU connector terminal No.14, 28, 27 
and D-41 microphone unit connector terminal 
No.2, 1, 3 <RHD>.

• Check the signal lines for open circuit and short 

circuit.

NOTE: Prior to the wiring harness inspection, check 
intermediate connector C-17 and repair if necessary.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the wiring harness.

STEP 4. Replace the microphone unit 
temporarily, and check the trouble symptom.

Q: Is the check result normal?

YES : 

Replace the microphone unit.

NO : 

Go to Step 5.

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 : 

The trouble can be an intermittent 
malfunction (Refer to GROUP 00 

− How to 

use Troubleshooting/inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction ).