Inspection Procedure 1: Check the hands free module power supply circuit: Diagnosis

Required Special Tools: 

• MB991223: Harness Set
• MB992006: Extra Fine Probe

1. STEP 1. Check hands free module connector C-110 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: IS hands free module connector C-110 in good condition? 

   • YES:  Go to Step 2.
   • NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION .
2. STEP 2. Check the ground circuit to the hands free module. Measure the resistance at hands free module connector C-110. 
   1. Disconnect hands free module connector C-110, and measure at the wiring harness side.
   2. Measure resistance between terminal 17 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.
     Fig 1: Measuring Resistance Between Terminal 17 And Ground

     Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
3. STEP 3. Check the wiring harness between hands free module connector C-110 (terminal 17) and ground. 
   • Check the body ground wires for open circuit.

   Q: Is the wiring harness between hands free module connector C-110 (terminal 17) and ground in good condition? 

   • YES:  The trouble can be an intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)
   • 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.
4. STEP 4. Check the power supply circuit to the hands free module. Measure the voltage at hands free module connector C-110. 
   1. Disconnect hands free module connector C-110, and measure the voltage available at the wiring harness side of the connector.
   2. Measure the voltage between terminal 1 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 6.
   • NO:  Go to Step 5.
     Fig 2: Measuring Voltage Between Terminal 1 And Ground

     Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
5. STEP 5. Check the wiring harness between hands free module connector C-110 (terminal 1) and fusible link (36). 
   • Check the power supply line for open circuit and short circuit.
   NOTE: Also check intermediate connector C-39, C-128 and ETACS-ECU connector C-307, C-311 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-39, C-128 and ETACS-ECU connector C-307, C-311 is damaged, repair or replace the connector as described in HARNESS CONNECTOR INSPECTION .

   Q: Is the wiring harness between hands free module connector C-110 (terminal 1) and fusible link (36) in good condition? 

   • YES:  The trouble can be an intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)
   • 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.
6. STEP 6. Check the power supply circuit to the hands free module. Measure the voltage at hands free module connector C-110. 
   1. Disconnect hands free module connector C-110, and measure the voltage available at the wiring harness side of the connector.
   2. Turn the ignition switch to "ACC" position.
   3. Measure the voltage between terminal 15 and ground.

      OK: 1 voltage or less. 

   Q: Is the measured voltage approximately 12 volts (battery positive voltage)? 

   • YES:  Replace the hands free module.
   • NO:  Go to Step 7.
     Fig 3: Measuring Voltage Between Terminal 15 And Ground

     Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
7. STEP 7. Check radio and CD player connector C-106 < Vehicles with radio and CD player > or multivision display connector C-107 < Vehicles with MMCS > for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is radio and CD player connector C-106 < Vehicles with radio and CD player > or multivision display connector C-107 < Vehicles with MMCS > in good condition? 

   • YES:  Go to Step 8.
   • NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION .
8. STEP 8. Check the wiring harness between hands free module connector C-110 terminal (terminal 15) and radio and CD player connector C-106 < vehicles with radio and CD player > or multivision display connector C-107 < vehicles with MMCS > terminal (terminal 17). 
   • Check the signal line for open circuit and short circuit.

   Q: Is the check result normal? 

   • YES:  Replace the radio and CD player or multivision display
   • 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.