Mitsubishi Evolution X. Manual - part 1032

HANDS-FREE CELLULAR PHONE SYSTEM

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CHASSIS ELECTRICAL

54A-489

SYMPTOM PROCEDURES

Inspection Procedure 1: Hands free cellular phone system does not work normally.

CAUTION

Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communi-
cation circuit are normal.

Hands Free Module Power Supply Circuit

FUSIBLE
LINK

36

HANDS FREE 
MODULE

RELAY BOX
 ENGINE 
 COMPARTMENT

HANDS-FREE CELLULAR PHONE SYSTEM

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CHASSIS ELECTRICAL

54A-490

Hands Free Cellular Phone System Circuit

MICROPHONE
UNIT

HANDS 
FREE 
MODULE

RADIO AND CD PLAYER

MULTIVISION
DISPLAY

<VEHICLES WITH 
  MITSUBISHI
  MULTI-COMMUNICATION 
  SYSTEM (MMCS)>

<VEHICLES WITHOUT 
  MITSUBISHI
  MULTI-COMMUNICATION 
  SYSTEM (MMCS)>

HANDS-FREE CELLULAR PHONE SYSTEM

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CHASSIS ELECTRICAL

54A-491

.

FUNCTION

During the conversation with the hands free cellular 
phone system, the signal of speaker's voice is trans-
mitted from the microphone unit to the hands free 
module. Then the signal is transmitted from the 
hands free module to the cellular phone. The voice of 
other party is transmitted from the cellular phone to 
the hands free module. Then, the voice is transmitted 
from the hands free module to the radio and CD 
player <vehicles without MMCS> or multivision dis-
play <vehicles with MMCS>, and output from the 
speaker.

.

TROUBLE JUDGMENT CONDITIONS

If the hands free cellular phone system cannot be 
used normally, the hands free module, microphone 
unit, steering wheel voice control switch, or radio and 
CD player <vehicles without MMCS> or multivision 
display <vehicles with MMCS> may be defective.

.

TROUBLESHOOTING HINTS

• The hands free module may be defective.

• The microphone unit may be defective.

• The steering wheel voice control switch may be 

defective.

• The radio and CD player <vehicles without 

MMCS> or multivision display <vehicles with 
MMCS> may be defective.

• Damaged harness wires and connectors

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB992006: Extra Fine Probe

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A (Vehicles with 

CAN communication system)

AC708951BS

Connectors: C-10, C-11, C-109, C-110

C-10 (GR)

C-109, 
C-110

C-11

AC708950

Connector: C-133

AF

AC708972AB

Connector: C-317

Junction block

AC708954 AT

Connector: D-04

HANDS-FREE CELLULAR PHONE SYSTEM

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CHASSIS ELECTRICAL

54A-492

STEP 1. Check the cellular phone.
Check that the cellular phone can be used normally as a unit.
Q: Is it possible to use the cellular phone normally?

YES : Go to Step 2.
NO :  Repair or replace the cellular phone.

STEP 2. Temporarily replace the cellular phone, and check 
the trouble symptom.
Temporarily register a separate Bluetooth

™-supported cellular 

phone, and check that the hands-free cellular phone system 
operates normally.
Q: Is the normal conversation possible with the hands free 

cellular phone system?
YES : Ask the customer to have the cellular phone repaired 

or replaced. Then, delete the temporarily registered 
cellular phone. Once the customer prepares the 
normally-working cellular phone, register the cellular 
phone to the hands free module.

NO :  Go to Step 3.

STEP 3. Using scan tool MB991958, diagnose the CAN bus 
line.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the 

Scan Tool (M.U.T.-III) 

P.54A-459

."

(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?

YES : Go to Step 4.
NO :  Repair the CAN bus line (Refer to GROUP 54C, 

Diagnosis 

P.54C-14

).

AC608435

Data link connector

MB991827

MB991824

MB991910

AB