Check Power Supply And Ground Circuit And Communication Circuit

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK POWER SUPPLY. Disconnect the MFD connector. 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. Disconnect the connector of combination meter assembly. 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. Remove the MFD. 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.