Mitsubishi Evolution X. Manual - part 1037

HANDS-FREE CELLULAR PHONE SYSTEM

TSB Revision

CHASSIS ELECTRICAL

54A-509

STEP 4. Check clock spring connectors C-202 and C-205 
for loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Are clock spring connectors C-202 and C-205 in good 

condition?
YES : Go to Step 5.
NO :  Repair or replace the damaged component (Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

). The steering remote control switch should 

work normally.

STEP 5. Check the clock spring.
Check whether the clock spring is in good condition (Refer to 
GROUP 52B 

− Driver’s air bag module and clock spring 

P.52B-392

).

Q: Is the check result normal?

YES : Go to Step 6.
NO :  Replace the clock spring.

STEP 6. Check the wiring harness between steering wheel 
voice control switch connector C-206 (terminal 4) and 
clock spring connector C-202 (terminal 1).

• Check the communication lines for open circuit and short 

circuit.

Q: Is the wiring harness between steering wheel 

voice-control switch connector C-206 (terminal 4) and 
clock spring connector C-202 (terminal 1) in good 
condition?
YES : Go to Step 7.
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 7. Check combination meter connector C-04 for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Is combination meter connector C-04 in good 

condition?
YES : Go to Step 8.
NO :  Repair or replace the damaged component (Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

). The steering remote control switch should 

work normally.

HANDS-FREE CELLULAR PHONE SYSTEM

TSB Revision

CHASSIS ELECTRICAL

54A-510

STEP 8. Check the wiring harness between combination 
meter connector C-04 (terminal 23) and clock spring 
connector C-205 (terminal 6).

• Check the communication lines for open circuit and short 

circuit.

Q: Is the wiring harness between combination meter 

connector C-04 (terminal 23) and clock spring 
connector C-205 (terminal 6) in good condition?
YES : Go to Step 9.
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 9. Retest the system
Check whether the illumination of the steering remote control 
switch comes on normally.
Q: Doe the illumination of the steering remote control 

switch comes on normally?
YES : 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

).

NO :  Replace the steering wheel voice control switch.

HANDS-FREE CELLULAR PHONE SYSTEM

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CHASSIS ELECTRICAL

54A-511

Inspection Procedure 7: Check the hands free module power supply circuit.

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

AC708951BT

Connector: C-11

AC708972BA

Connectors: C-307, C-317

ETACS-ECU

C-307 (B)

C-317

HANDS-FREE CELLULAR PHONE SYSTEM

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CHASSIS ELECTRICAL

54A-512

CIRCUIT OPERATION

The power supply to the hands free module is pro-
vided by the fusible link (36).

.

TECHNICAL DESCRIPTION (COMMENT)

If the hands free cellular phone system don't work, 
power supply and ground system to the hands free 
module, or the hands free module itself may be 
defective.

.

TROUBLESHOOTING HINTS

• The wiring harness or connectors may have 

loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector

• The hands free module may be defective

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB992006: Extra Fine Probe

STEP 1. Check hands free module connector C-11 for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Is hands free module connector C-11 in good condition?

YES : Go to Step 2.
NO :  Repair or replace the damaged component (Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

).

STEP 2. Check the ground circuit to the hands free 
module. Measure the resistance at hands free module 
connector C-11.
(1) Disconnect hands-free module connector C-11, and 

measure at the wiring harness side.

(2) Measure the resistance value between terminal 15 and 

ground.

OK: The resistance should be 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 4.
NO :  Go to Step 3.

AC709322 BK

Harness side: C-11