Check Clock System Communication Circuit

Step	Check	Yes	No
1 CHECK POWER SUPPLY. Disconnect the MFD connector. Turn the ignition switch to ON. Measure the voltage between MFD connector and chassis ground. Connector & terminal (i122) No. 3 (+) - Chassis ground (-):	Is the voltage 10 V or more?	Go to step 2 .	Repair or replace the harness.
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 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 the MFD normal?	Replace the meter - main assembly.	Replace the MFD.