INSPECTION PROCEDURE 1: The multi-center display does not Show any Information: Diagnosis

Required Special Tools: 

• MB991223: Harness Set
• MB992006: Extra Fine Probe

1. STEP 1. Check the multi-center display unit connector C-06 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is the multi-center display unit connector C-06 in good condition? 

   YES:  Go to Step  2.

   NO:  Repair or replace the connector. Refer to HARNESS CONNECTOR INSPECTION .

   Fig 1: Identifying C-06 Connector Terminals

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2. STEP 2. Check the multi-center display unit ground circuit. Measure the resistance at the multi-center display unit connector C-06. 
   1. Disconnect the multi-center display unit connector C-06 and measure at the harness side.
      Fig 2: Identifying C-06 Connector Terminals

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   2. Measure the resistance between terminal 6 and ground.
      • The measured value should be 2 ohm or less.

   Q: Is the measured resistance 2 ohm or less? 

   YES:  Go to Step  4.

   NO:  Go to Step  3.

   Fig 3: Measuring Resistance Between Terminal 6 And Ground

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3. STEP 3. Check the wiring harness between multi-center display unit connector C-06 (terminal 6) and ground. 
   Fig 4: Identifying C-06 Connector Terminals

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   NOTE: After checking joint connector (2) C-01 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. check the wires. If joint connector (2) C-01 is damaged, repair or replace the wiring harness. Refer to HARNESS CONNECTOR INSPECTION .

   Q: Is the wiring harness between multi-center display unit connector C-06 (terminal 6) and ground in good condition? 

   YES:  There is no action to be taken.

   NO:  Repair the wiring harness. The multi-center display unit should work normally.

   Fig 5: Identifying Connector C-01 Terminals

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4. STEP 4. Check the multi-center display unit power supply circuit (battery). Measure the voltage at the multi-center display unit connector C-06. 
   1. Disconnect the multi-center display unit connector C-06 and measure at the harness side.
      Fig 6: Identifying C-06 Connector Terminals

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   2. Measure the voltage between terminal 1 and ground.
      • The measured value should be approximately 12 volts (battery positive voltage).

   Q: Is the measured voltage approximately 12 volts? 

   YES:  Go to Step  6.

   NO:  Go to Step  5.

   Fig 7: Measuring Voltage Between Terminal 1 And Ground

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5. STEP 5. Check the wiring harness between multi-center display unit connector C-06 (terminal 1) and battery. 
   Fig 8: Locating Connector C-06(B)

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   NOTE: Also check intermediate connector C-24 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-24 is damaged, repair or replace the wiring harness. Refer to HARNESS CONNECTOR INSPECTION .

   Q: Is the wiring harness between multi-center display unit connector C-06 and battery in good condition? 

   YES:  There is no action to be taken.

   NO:  Repair the wiring harness. The multi-center display unit should work normally.

   Fig 9: Identifying Connector A-24 Terminals

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6. STEP 6. Check the multi-center display unit power supply circuit [ignition switch (ACC)]. Measure the voltage at the multi-center display unit connector C-06. 
   1. Disconnect the multi-center display unit connector C-06 and measure at the harness side.
   2. Turn the ignition switch to "ACC" position.
      Fig 10: Identifying C-06 Connector Terminals

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

   Q: Is the measured voltage approximately 12 volts? 

   YES:  Go to Step  8.

   NO:  Go to Step  7.

   Fig 11: Measuring Voltage Between Terminal 3 And Ground

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7. STEP 7. Check the wiring harness between multi-center display unit connector C-06 (terminal 3) and ignition switch (ACC). 
   Fig 12: Identifying C-06 Connector Terminals

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   NOTE: Also check joint connector (2) C-01, and intermediate connector C-24 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If or joint connector (2) C-01 or intermediate connector C-24 is damaged, repair or replace the wiring harness. Refer to HARNESS CONNECTOR INSPECTION .

   Q: Is the wiring harness between multi-center display unit connector C-06 (terminal 3) and ignition switch (ACC) in good condition? 

   YES:  There is no action to be taken.

   NO:  Repair the wiring harness. The multi-center display unit should work normally.

   Fig 13: Locating Joint Connector C-01 And Intermediate Connector C-24

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8. STEP 8. Check the multi-center display unit power supply circuit [ignition switch (IG1)]. Measure the voltage at the multi-center display unit connector C-06. 
   1. Disconnect the multi-center display unit connector C-06 and measure at the harness side.
   2. Turn the ignition switch to "ON" position.
      Fig 14: Identifying C-06 Connector Terminals

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

   Q: Is the measured voltage approximately 12 volts? 

   YES:  Replace the multi-center display unit. The multi-center display unit should work normally.

   NO:  Go to Step  9.

   Fig 15: Measuring Voltage Between Terminal 2 And Ground

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9. STEP 9. Check the wiring harness between multi-center display unit connector C-06 (terminal 2) and ignition switch (IG1). 
   Fig 16: Identifying C-06 Connector Terminals

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   NOTE: Also check joint connector (2) C-01, junction block connectors C-202 and C-215 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If joint connector (2) C-01 or junction block connectors C-202 or C-215 is damaged, repair or replace the wiring harness. Refer to HARNESS CONNECTOR INSPECTION .
   Fig 17: Identifying Connector C-01 Terminals

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   Q: Is the wiring harness between multi-center display unit connector C-06 (terminal 2) and ignition switch (IG1) in good condition? 

   YES:  The procedure is complete.

   NO:  Repair the wiring harness. The multi-center display unit should work normally.

   Fig 18: Locating Junction Block Connectors C-202 And C-215

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