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
.).
STEP 2. 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 3.
NO :
Perform Inspection Procedure 5
"DIAGNOSIS MODE cannot be made an
entry." (Refer to
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
<Using radio and CD player> or
<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 ).
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