Mitsubishi Evolution X. Manual - part 1033

HANDS-FREE CELLULAR PHONE SYSTEM

TSB Revision

CHASSIS ELECTRICAL

54A-493

STEP 4. Check hands free module connector C-11 for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Are hands free module connector C-11 in good 

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

to GROUP 00E, Harness Connector Inspection 

P.00E-2

.

STEP 5. 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 resistance between terminal 15 and ground.

OK: The resistance should be 2 ohm or less.

Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 7.
NO :  Go to Step 6.

STEP 6. Check the wiring harness between hands free 
module connector C-11 (terminal 15) and ground.

• Check the ground wires for open circuit.

Q: Is the wiring harness between hands free module 

connector C-11 (terminal 15) and ground in good 
condition?
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 :  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.

AC709322 BK

Harness side: C-11

HANDS-FREE CELLULAR PHONE SYSTEM

TSB Revision

CHASSIS ELECTRICAL

54A-494

STEP 7. Check the power supply circuit to the hands free 
module. Measure the voltage at hands free module 
connector C-11.
(1) Disconnect hands free module connector C-11, and 

measure the voltage available at the hands free module 
side of the connector.

(2) Measure the voltage between terminal 13 and ground.

OK: The voltage should measure approximately 12 
volts (battery positive voltage).

Q: Is the measured voltage approximately 12 volts (battery 

positive voltage)?
YES : Go to Step 9.
NO :  Go to Step 8.

STEP 8. Check the wiring harness between hands free 
module connector C-11 (terminal 13) and ETACS-ECU 
connector C-317 (terminal 1).

• Check the communication lines for open circuit and short 

circuit.

Q: Is the wiring harness between hands free module 

connector C-11 (terminal 13) and ETACS-ECU connector 
C-317 (terminal 1) in good condition?
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 :  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. Check microphone unit connector D-04 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is microphone unit connector D-04 in good condition?

YES : Go to Step 10.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

.

AC709325 AJ

Harness side: C-11

HANDS-FREE CELLULAR PHONE SYSTEM

TSB Revision

CHASSIS ELECTRICAL

54A-495

STEP 10. Check the wiring harness between hands free 
module connector C-11 and microphone unit connector 
D-04.

• Check the communication lines for open circuit and short 

circuit.

(1) Disconnect hands free module connector C-11 and 

microphone unit connector D-04, and check the wiring 
harness.
NOTE: Also check intermediate connector C-133 for loose, 
corroded, or damaged terminals, or terminals pushed back 
in the connector. If intermediate connector C-133 is dam-
aged, repair or replace the connector as described in 
GROUP 00E, Harness Connector Inspection 

P.00E-2

.

(2) Check the wiring harness between hands free module 

connector C-11 (terminal 24) and microphone unit 
connector D-04 (terminal 2)

(3) Check the wiring harness between hands free module 

connector C-11 (terminal 23) and microphone unit 
connector D-04 (terminal 1)

Q: Is the wiring harness between hands free module 

connector C-11 and microphone unit connector D-04 in 
good condition?
YES : Go to Step 11.
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 11. Check radio and CD player connector C-109 
<vehicles without MMCS> or multivision display connector 
C-10 <vehicles with MMCS> for loose, corroded or 
damaged terminals, or terminals pushed back in the 
connector.
Q: Is radio and CD player connector C-109 <vehicles 

without MMCS> or multivision display connector C-10 
<vehicles with MMCS> in good condition?
YES : Go to Step 12.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

.

HANDS-FREE CELLULAR PHONE SYSTEM

TSB Revision

CHASSIS ELECTRICAL

54A-496

STEP 12. Check the wiring harness between hands free 
module connector C-11 and radio and CD player connector 
C-109 <vehicles without MMCS> or multivision display 
connector C-10 <vehicles with MMCS>.

• Check the communication lines for open circuit and short 

circuit.

(1) Disconnect hands free module connector C-11 and radio 

and CD player connector C-109 <vehicles without MMCS> 
or multivision display connector C-10 <vehicles with 
MMCS>, and check the wiring harness.
NOTE: Also check intermediate connector C-110 for loose, 
corroded, or damaged terminals, or terminals pushed back 
in the connector. If intermediate connector C-110 is dam-
aged, repair or replace the connector as described in 
GROUP 00E, Harness Connector Inspection 

P.00E-2

. 

<vehicles with MMCS>

(2) Check the wiring harness between hands free module 

connector C-11 (terminal 9) and radio and CD player 
connector C-109 (terminal 3) <vehicles without MMCS>

(3) Check the wiring harness between hands free module 

connector C-110 (terminal 21) and radio and CD player 
connector C-109 (terminal 2) <vehicles without MMCS>

(4) Check the wiring harness between hands free module 

connector C-11 (terminal 9) and multivision display 
connector C-10 (terminal 35) <vehicles without MMCS>

(5) Check the wiring harness between hands free module 

connector C-11 (terminal 21) and multivision display 
connector C-10 (terminal 36) <vehicles without MMCS>

Q: Is the wiring harness between hands free module 

connector C-11 and radio and CD player connector 
C-109 <vehicles without MMCS> or multivision display 
connector C-10 <vehicles with MMCS> in good 
condition?
YES : Go to Step 13.
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 13. Temporarily replace the microphone unit, and 
check the trouble symptom.
Check that the normal conversation is possible with the hands 
free cellular phone system.
Q: Is the normal conversation possible with the hands free 

cellular phone system?
YES : Replace the microphone unit.
NO :  Go to Step 14.