INSPECTION PROCEDURE 5: No Sound. < Vehicles with Audio Amplifier >: Diagnosis

Required Special Tool: 

• MB991223: Harness set

1. STEP 1. Measure the voltage at audio amplifier connector C-113 in order to check the battery circuit of power supply system to the audio amplifier. 
   1. Disconnect audio amplifier connector C-113, and measure at the wiring harness side.
      Fig 1: Locating Audio Amplifier Connector C-113

      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 2.

   Fig 2: Measuring Voltage Between Terminals 5, 15, 16 And Ground

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. STEP 2. Check audio amplifier connector C-113 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is audio amplifier connector C-113 in good condition? 

   YES:  Go to Step 3.

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

   Fig 3: Locating Audio Amplifier Connector C-113

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
3. STEP 3. Check the wiring harness between audio amplifier connector C-113 (terminal 5, 15 and 16) and the battery. 
   Fig 4: Locating Audio Amplifier Connector C-113

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   NOTE: Also check intermediate connector C-29 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connectors C-29 is damaged, repair or replace the connector as described in HARNESS CONNECTOR INSPECTION .

   Q: Is the wiring harness between audio amplifier connector C-113 (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 C-29 Terminals

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4. STEP 4. Measure the resistance at audio amplifier connector C-113 in order to check the ground circuit to the audio amplifier. 
   1. Disconnect audio amplifier connector C-113, and measure at the wiring harness side.
      Fig 6: Locating Audio Amplifier Connector C-113

      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 12 and ground.
      • The resistance should be 2 ohms or less.

   Q: Is the measured resistance 2 ohms or less? 

   YES:  Go to Step  7.

   NO:  Go to Step 5.

   Fig 7: Measuring Resistance Between Terminals 4, 11, 12 And Ground

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
5. STEP 5. Check audio amplifier connector C-113 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is audio amplifier connector C-113 in good condition? 

   YES:  Go to Step 6.

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

   Fig 8: Locating Audio Amplifier Connector C-113

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
6. STEP 6. Check the wiring harness between audio amplifier connector C-113 (terminal 4, 11 and 12) and ground. 

   Q: Is the wiring harness between audio amplifier connector C-113 (terminal 4, 11 and 12) and ground in good condition? 

   YES:  There is no action to be taken.

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

   Fig 9: Locating Audio Amplifier Connector C-113

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
7. STEP 7. Check radio, CD player and CD changer connector C-134 and audio amplifier connector C-114 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Are radio, CD player and CD changer connector C-134 and audio amplifier connector C-114 in good condition? 

   YES:  Go to Step 8.

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

   Fig 10: Locating CD Changer Connector C-134 And Audio Amplifier Connector C-114

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
8. STEP 8. Check the wiring harness between CD player and CD changer connector C-134 (terminals 21, 22, 23, 25, 26, 32, 34, 35 and 37) and audio amplifier connector C-114 (terminals 24, 34, 27, 22, 21, 31, 32, 25 and 28). 

   Q: Do the speakers sound normally? 

   YES:  The procedure is complete.

   NO:  Repair or replace the audio amplifier.

   Fig 11: Locating CD Changer Connector C-134 And Audio Amplifier Connector C-114

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.