Inspection Procedure 6: Combination Meter Does Not Work: Diagnosis

Required Special Tools: 

• MB991223: Harness Set

1. STEP 1. Measure at combination meter connector C-01 in order to check the battery circuit of power supply system to the combination meter. 
   1. Disconnect combination meter connector C-01, and measure at the wiring harness side.
      Fig 1: Identifying Connector C-01

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   2. Measure the voltage between terminal 7 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 7 And Ground

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2. STEP 2. Check combination meter connector C-01 for damage. 

   Q: Is combination meter connector C-01 in good condition? 

   1. YES:  Go to Step 3.
   2. NO:  Repair or replace the connector. Refer to HARNESS CONNECTOR INSPECTION . Check to see that all meters operate.
      Fig 3: Identifying Connector C-01

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3. STEP 3. Check the wiring harness between combination meter connector C-01 (terminal 7) and battery. 
   Fig 4: Identifying Combination Meter Connector C-01

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   NOTE: Also check intermediate connector C-129 and joint connector (1) C- 05. If intermediate connectors C-129 or joint connector (1) C-05 is damaged, repair or replace the connector as described in HARNESS CONNECTOR INSPECTION .

   Q: Are the wiring harness between combination meter connector C-01 (terminal 7) and battery in good condition? 

   1. YES:  There is no action to be taken.
   2. NO:  Repair the wiring harness. Check to see that all meters operate.
      Fig 5: Identifying Fusible Link

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      Fig 6: Identifying Connector C-129

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      Fig 7: Identifying Connector C- 05

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4. STEP 4. Measure at combination meter connector C-01 in order to check the battery circuit of power supply system to the combination meter. 
   1. Disconnect combination meter connector C-01, and measure at the wiring harness side.
   2. Turn the ignition switch to "ON" position.
      Fig 8: Identifying Connector C-01 Terminals

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   3. Measure the voltage between terminal 9 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 7.
   2. NO:  Go to Step 5.
      Fig 9: Measuring Voltage Between Terminal 9 And Ground

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5. STEP 5. Check combination meter connector C-01 for damage. 

   Q: Is combination meter connector C-01 in good condition? 

   1. YES:  Go to Step 6.
   2. NO:  Repair or replace the connector. Refer to HARNESS CONNECTOR INSPECTION . . Check to see that all meters operate.
      Fig 10: Identifying Connector C-01

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6. STEP 6. Check the wiring harness between combination meter connector C-01 (terminal 9) and ignition switch (IG1). 
   Fig 11: Identifying Connector C-01

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   NOTE: Also check junction block connectors C-211, C-214 and joint connector (5) C-21. If junction block connectors C-211, C-214 or joint connector (5) C-21 are damaged, repair or replace the connector as described in HARNESS CONNECTOR INSPECTION .

   Q: Are the wiring harness between combination meter connector C-01 (terminal 9) and ignition switch (IG1) in good condition? 

   1. YES:  There is no action to be taken.
   2. NO:  Repair the wiring harness. Check to see that all meters operate.
      Fig 12: Identifying Connectors C-211, C-214

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      Fig 13: Identifying Joint Connector C-21

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7. STEP 7. Measure at combination meter connector C-01 in order to check the ground circuit to the combination meter. 
   1. Disconnect combination meter connector C-01, and measure at the wiring harness side.
      Fig 14: Identifying Connector C-01 Terminals

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   2. Measure the resistance between terminal 1 and ground.
      • The measured value should be 2 ohm or less.
   3. Measure the resistance between terminal 2 and ground.
      • The measured value should be 2 ohm or less.

   Q: Does the measured voltage correspond with this range? 

   1. YES:  Repair the combination meter. Check to see that all meters operate.
   2. NO:  Go to Step 8.
      Fig 15: Measuring Resistance Between Terminal 2 And Ground

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8. STEP 8. Check combination meter connector C-01 for damage. 

   Q: Is combination meter connector C-01 in good condition? 

   1. YES:  Go to Step 9.
   2. NO:  Repair or replace the connector. Refer to HARNESS CONNECTOR INSPECTION . . Check to see that all meters operate.
      Fig 16: Identifying Combination Meter Connector C-01

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9. STEP 9. Check the wiring harness between combination meter connector C-01 (terminal 1 and 2) and ground. 

   Q: Are the wiring harness between combination meter connector C-01 (terminal 1 and 2) and ground in good condition? 

   1. YES:  There is no action to be taken.
   2. NO:  Repair the wiring harness. Check to see that all meters operate.
      Fig 17: Identifying Combination Meter Connector C-01

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