INSPECTION PROCEDURE 5: No Sound. < Vehicles with audio amplifier>: Diagnosis

Required Special Tools: 

• MB991223: Harness set
• MB992006: Extra Fine Probe

1. STEP 1. Check audio amplifier connector C-114 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is audio amplifier connector C-114 in good condition? 

   YES:  Go to Step  2.

   NO:  Repair or replace the component(s). Refer to HARNESS CONNECTOR INSPECTION . The speakers should sound.

   Fig 1: Identifying Connector C-114 Terminals

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. STEP 2. Measure the voltage at audio amplifier connector C-114 in order to check the battery circuit of power supply system to the audio amplifier. 
   1. Disconnect audio amplifier connector C-114, and measure at the wiring harness side.
      Fig 2: Identifying Connector C-114 Terminals

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   2. Measure the voltage between terminal 5 and ground.
      • The voltage should measure approximately 12 volts (battery positive voltage).
   3. Measure the voltage between terminal 15 and ground.
      • The voltage should measure approximately 12 volts (battery positive voltage).
   4. Measure the voltage between terminal 16 and ground.
      • 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  4.

   NO:  Go to Step  3.

   Fig 3: Measuring Voltage Between Terminals 5, 15 & 16 And Ground

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
3. STEP 3. Check the wiring harness between audio amplifier connector C-114 (terminal 5, 15 and 16) and the battery. 
   Fig 4: Identifying Connector C-114 Terminals

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   NOTE: Also check intermediate connector C-24 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connectors C-24 is damaged, repair or replace the connector as described in HARNESS CONNECTOR INSPECTION .

   Q: Is the wiring harness between audio amplifier connector C-114 (terminal 5, 15 and 16) and the battery in good condition? 

   YES:  There is no action to be taken.

   NO:  Repair the wiring harness. The speakers should sound.

   Fig 5: Identifying Connector A-24 Terminals

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
4. STEP 4. Measure the resistance at audio amplifier connector C-114 in order to check the ground circuit to the audio amplifier. 
   1. Disconnect audio amplifier connector C-114, and measure at the wiring harness side.
      Fig 6: Identifying Connector C-114 Terminals

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   2. Measure the resistance between terminal 4 and ground.
      • The resistance should be 2 ohms or less.
   3. Measure the resistance between terminal 11 and ground.
      • The resistance should be 2 ohms or less.
   4. Measure the resistance between terminal 17 and ground.
      • The resistance should be 2 ohms or less.

   Q: Is the measured resistance 2 ohms or less? 

   YES:  Go to Step  6.

   NO:  Go to Step  5.

   Fig 7: Measuring Resistance Between Terminals 4, 11 & 17 And Ground

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
5. STEP 5. Check the wiring harness between audio amplifier connector C-114 (terminal 4, 11 and 17) and ground. 

   Q: Is the wiring harness between audio amplifier connector C-114 (terminal 4, 11 and 17) and ground in good condition? 

   YES:  There is no action to be taken.

   NO:  Repair the wiring harness. The speakers should sound.

   Fig 8: Identifying Connector C-114 Terminals

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
6. STEP 6. Check radio and CD player with CD changer connector C-119 and audio amplifier connector C-115 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Are radio and CD player with CD changer connector C-119 and audio amplifier connector C-115 in good condition? 

   YES:  Go to Step  7.

   NO:  Repair or replace the component(s). Refer to HARNESS CONNECTOR INSPECTION . The door speaker (LH) should sound.

   Fig 9: Locating CD Changer Connector C-119 And Audio Amplifier Connector C-115

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
7. STEP 7. Check the wiring harness between CD player and CD changer connector C-119 (terminals 21, 22, 23, 24, 25, 26, 32, 33, 34, 35, 36 and 37) and audio amplifier connector C-115 (terminals 24, 34, 27, 33, 22, 21, 31, 26, 30, 32, 25, 29, and 28). 

   Q: Do the speakers sound normally? 

   YES:  The procedure is complete.

   NO:  Replace the audio amplifier.

   Fig 10: Locating CD Changer Connector C-119 And Audio Amplifier Connector C-115

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.