Mitsubishi Evolution X. Manual - part 1035

HANDS-FREE CELLULAR PHONE SYSTEM

TSB Revision

CHASSIS ELECTRICAL

54A-501

Inspection Procedure 4: Even when the steering wheel voice control switch is operated, the 
conversation is not possible.

Steering Wheel Voice Controln Switch Circuit

MULTEVISION
DISPLAY

CLOCK 
SPRING

STEERING WHEEL
AUDIO REMOTE
CONTROL SWITCH

STEERING WHEEL
VOICE CONTROL
SWITCH

HANDS-FREE CELLULAR PHONE SYSTEM

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CHASSIS ELECTRICAL

54A-502

Steering Wheel Voice Controln Switch Circuit

RADIO AND CD PLAYER

CLOCK 
SPRING

STEERING WHEEL
AUDIO REMOTE 
CONTROL SWITCH

STEERING WHEEL
VOICE CONTROL 
SWITCH

HANDS-FREE CELLULAR PHONE SYSTEM

TSB Revision

CHASSIS ELECTRICAL

54A-503

.

FUNCTION

When the steering wheel voice control switch is oper-
ated, the switch signal is transmitted to the radio and 
CD player <vehicles without MMCS> or multivision 
display <vehicles with MMCS>. Then, via the CAN 
communication, the signal is transmitted from the 
radio and CD player <vehicles without MMCS> or 
multivision display <vehicles with MMCS> to the 
hands free module.

.

TROUBLE JUDGMENT CONDITIONS

If the conversation is not possible even when the 
steering wheel voice control switch is operated, the 
steering wheel voice control switch or radio and CD 
player <vehicles without MMCS> or the multivision 
display <vehicles with MMCS> may be defective.

.

TROUBLESHOOTING HINTS

• The steering wheel voice control switch may be 

defective.

• The hands free module 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)

STEP 1. Check the steering wheel audio remote control 
switch.
Check that the radio and CD player <vehicles without MMCS> 
or multivision display <vehicles with MMCS> can be operated 
normally using the steering wheel audio remote control switch.
Q: Is it possible to normally operate the radio and CD 

player <vehicles without MMCS> or multivision display 
<vehicles with MMCS> using the steering wheel audio 
remote control switch?
YES : Go to Step 2.
NO :  Diagnose the steering wheel audio remote control 

switch (Refer to 

P.54A-317

 <vehicles without MMCS> 

or 

P.54A-408

 <vehicles with MMCS>.)

AC708953AD

Connectors: C-202, C-206, C-213

C-206 (Y)

C-202

C-213 (R)

HANDS-FREE CELLULAR PHONE SYSTEM

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CHASSIS ELECTRICAL

54A-504

STEP 2. 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 3.
NO :  Repair the CAN bus line (Refer to GROUP 54C, 

Diagnosis 

P.54C-14

).

STEP 3. Check the steering wheel voice control switch.
Remove the steering wheel voice control switch. Then check 
continuity between the switch terminals.(Refer to 

P.54A-518

)

Q: Is the steering wheel voice control switch in good 

condition?
YES : Go to Step 4.
NO :  Replace the steering wheel voice control switch.

STEP 4. Check the steering wheel audio remote control 
switch.
Remove the steering wheel audio remote control switch. Then 
check continuity between the switch terminals. (Refer to 

P.54A-535

)

Q: Is the steering wheel audio remote control switch in 

good condition?
YES : Go to Step 5.
NO :  Replace the steering wheel audio remote control 

switch.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB