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Check Power Supply And Ground Circuit And Communication Circuit

Step Check Yes No
1 CHECK POWER SUPPLY  .
  1. Disconnect the MFD connector.
  2. Measure the voltage between MFD connector and chassis ground.

    Connector & terminal 

    (i122) No. 1 (+) - Chassis ground (-): 

 Is the voltage 10 V or more? Go to step 2  . Check the harness for open or short between the fuse and MFD.
2 CHECK GROUND CIRCUIT  .
Measure the resistance between MFD connector and chassis ground.
Connector & terminal 
(i122) No. 2 - Chassis ground: 		 Is the resistance less than 10 Ω? Go to step 3  . Repair or replace the harness.
3 CHECK HARNESS BETWEEN MFD AND COMBINATION METER ASSEMBLY  .
  1. Disconnect the connector of combination meter assembly.
  2. Check the harness between MFD and combination meter assembly.

Connector & terminal 
(i122) No. 9 - (i10) No. 28: 		 Is harness normal? Go to step 4  . Repair or replace the harness.
4 CHECK MFD  .
  1. Remove the MFD.
  2. Attach the clock to another vehicle on which the clock display operates normally, and check its operation.
 Is MFD normal? Replace the meter - main assembly. Ref. to COMBINATION METER . Replace the MFD.
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