INSPECTION PROCEDURE 2: No Sound. < Vehicles with Amplifier >: Diagnosis

Required Special Tool: 

• MB991223: Harness set

1. STEP 1. Measure at amplifier connector D-27 by backprobing in order to check the battery circuit of power supply system to the amplifier. 
   1. Measure at amplifier connector D-27 without disconnecting the connector.
      Fig 1: Identifying Amplifier Connector D-27

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   2. Measure the voltage between terminal 2 and ground.
      • The measured value should be approximately 12 volts (battery positive voltage).
   3. Measure the voltage between terminal 10 and ground.
      • The measured value should be approximately 12 volts (battery positive voltage).

   Q: Does the measured voltage correspond with this range? 

   1. YES  : Go to  Step 4.
   2. NO  : Go to Step 2.
   Fig 2: Measuring Voltage Between Terminal 2 And Ground

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2. STEP 2. Check amplifier connector D-27 for damage. 

   Q: Is amplifier connector D-27 in good condition? 

   1. YES  : Go to Step 3.
   2. NO  : Repair or replace the connector. Refer to HARNESS CONNECTOR INSPECTION . The speakers should sound.
   Fig 3: Identifying Amplifier Connector D-27

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3. STEP 3. Check the wiring harness between amplifier connector D-27 (terminal 10 and 2) and battery. 
   Fig 4: Identifying Amplifier Connector D-27

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   NOTE: Also check intermediate connector C-116 and C-117. If intermediate connectors C-116 or C-117 are damaged, repair or replace the connector as described in HARNESS CONNECTOR INSPECTION .

   Q: Are the wiring harness between amplifier connector D-27 (terminal 10 and 2) and battery in good condition? 

   1. YES  : There is no action to be taken.
   2. NO  : Repair the wiring harness. The speakers should sound.
   Fig 5: Identifying Connector Terminals C-116 And C-117

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4. STEP 4. Measure at amplifier connector D-27 by backprobing in order to check the ground circuit to the amplifier. 
   1. Measure at amplifier connector D-27 without disconnecting the connector.
      Fig 6: Identifying Amplifier Connector D-27

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   2. Measure the resistance between terminal 1 and ground by backprobing.
      • The measured value should be 2 ohms or less.
   3. Measure the resistance between terminal 9 and ground by backprobing.
      • The measured value should be 2 ohms or less.

   Q: Does the measured resistance value correspond with this range? 

   1. YES  : Go to  Step 7.
   2. NO  : Go to Step 5.
   Fig 7: Measuring Resistance Between Terminal 9 And Ground

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5. STEP 5. Check amplifier connector D-27 for damage. 

   Q: Is amplifier connector D-27 in good condition? 

   1. YES  : Go to Step 6.
   2. NO  : Repair or replace the connector. Refer to HARNESS CONNECTOR INSPECTION . The speakers should sound.
   Fig 8: Identifying Amplifier Connector D-27

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
6. STEP 6. Check the wiring harness between amplifier connector D-27 (terminal 1 and 9) and ground. 

   Q: Are the wiring harness between amplifier connector D-27 (terminal 1 and 9) and ground in good condition? 

   1. YES  : There is no action to be taken.
   2. NO  : Repair the wiring harness. The speakers should sound.
   Fig 9: Identifying Amplifier Connector D-27

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
7. STEP 7. Check the DIN cable between amplifier and radio and CD player. 

   Q: Are the DIN cable in good condition? 

   1. YES  : Go to Step 8.
   2. NO  : Repair or replace the DIN cable. The speakers should sound.
8. STEP 8. Replace the radio and CD player. 

   Q: Is sound output normally from all the speakers? 

   1. YES  : There is no action to be taken.
   2. NO  : Repair or replace the amplifier. The speakers should sound.