Mitsubishi Evolution X. Manual - part 1026

HANDS-FREE CELLULAR PHONE SYSTEM

TSB Revision

CHASSIS ELECTRICAL

54A-465

STEP 2. Check microphone unit connector D-04 and hands 
free module connector C-11 for loose, corroded or 
damaged terminals, or terminals pushed back in the 
connector.
Q: Are microphone unit connector D-04 and hands free 

module connector C-11 in good condition?
YES : Go to Step 3.
NO :  Repair the defective connector.

STEP 3. Check the wiring harness between microphone 
unit connector D-04 (terminal 1, 2) and hands free module 
connector C-11 (terminal 23, 24).

• Check the communication lines for open circuit and short 

circuit.

NOTE: Also check intermediate connector C-133 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the 
connector. If intermediate connector C-133 is damaged, repair 
or replace the connector as described in GROUP 00E, Harness 
Connector Inspection 

P.00E-2

.

Q: Is the wiring harness between microphone unit 

connector D-04 (terminal 1, 2) and hands free module 
connector C-11 (terminal 23, 24) in good condition?
YES : Go to Step 4.
NO :  The wiring harness may be damaged or the 

connector(s) may have loose, corroded or damaged 
terminals, or terminals pushed back in the connector. 
Repair the wiring harness as necessary.

STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is set to the hands free module.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" 

position.

(3) Check if DTC is set.
Q: Is the DTC set?

YES : Go to Step 5.
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 

P.00-15

).

STEP 5. Temporarily replace the microphone unit, and 
check whether the diagnostic trouble code.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" 

position.

(3) Check if DTC.
Q: Is the DTC set?

YES : Replace the hands free module.
NO :  Replace the microphone unit.

HANDS-FREE CELLULAR PHONE SYSTEM

TSB Revision

CHASSIS ELECTRICAL

54A-466

DTC B2471: On hook button stuck

 

DTC B2472: Off hook button stuck

 

DTC B2473: VR button stuck

CAUTION

• Before replacing the ECU, ensure that the communication circuit is normal.

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-467

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

TSB Revision

CHASSIS ELECTRICAL

54A-468

.

JUDGMENT CRITERIA

When the hands free module receives any switch 
signal from the speech switch, pick-up switch, 
hang-up switch of steering wheel voice control switch 
for approximately 1 or 2 minutes continuously, it 
stores diagnostic trouble code B2471 (hang-up 
switch), B2472 (pick-up switch) or B2470 (speech 
switch) for each switch.

.

PROBABLE CAUSES

• Damaged harness wires and connectors

• The hands free module may be defective.

• The microphone unit may be defective.

• The CAN bus line 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.

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB992006: Extra Fine Probe

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

• MB991824: Vehicles 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 radio and CD player <vehicles without 
MMCS> or multivision display <vehicles with MMCS>.
Check that the radio and CD player <vehicles without MMCS> 
or multivision display <vehicles with MMCS> works normally.
Q: Is the check result normal?

YES : Go to Step 2.
NO :  Diagnose the radio and CD player <vehicles without 

MMCS> or multivision display <vehicles with MMCS> 
(Refer to Radio and CD player 

− Diagnosis 

P.54A-317

 

<vehicles without MMCS> or MMCS 

− Diagnosis 

P.54A-408

 <vehicles with MMCS>).

STEP 2. 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 the check result normal?

YES : Go to Step 3.
NO :  Diagnose the steering wheel audio remote control 

switch (Refer to 

P.54A-522

 <vehicles without MMCS> 

or 

P.54A-527

 <vehicles with MMCS>).

AC708953AD

Connectors: C-202, C-206, C-213

C-206 (Y)

C-202

C-213 (R)