DTC U1651 Lost Communication With Meter (UART): Wiring Diagram

Multi-function display (MFD) system Ref. to the appropriate SYSTEM WIRING diagram article.

Fig 1: Multi-Function Display Wiring Diagram

G09484522

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK LAN SYSTEM. Read the DTC of the LAN system using the Subaru Select Monitor. < Ref. to OPERATION , Read Diagnostic Trouble Code (DTC). >	Is DTC displayed?	Perform the diagnosis according to DTC.	Go to step 2.
2 CHECK CONNECTOR. Disconnect the MFD connector and meter connector. Connect the disconnected connectors. Read the DTC of the MFD using the Subaru Select Monitor. < Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) . >	Is DTC U1651 a current malfunction?	Go to step 3.	There was poor contact of connector.
3 CHECK HARNESS. Disconnect the MFD connector and meter connector. Using the tester, measure the resistance between terminals. Connector & terminal (i10) No. 28 - (i122) No. 9:	Is the resistance 10 Ω or less?	Go to step 4.	Repair the open circuit of harness or replace harness.
4 CHECK HARNESS. Using the tester, measure the resistance between terminals. Connector & terminal (i122) No. 9 - Chassis ground:	Is the resistance 10 Ω or less?	Repair the short circuit of harness or replace harness.	Go to step 5.
5 CHECK COMBINATION METER. Replace the combination meter. < Ref. to COMBINATION METER . > Read the DTC of the MFD using the Subaru Select Monitor. < Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) . >	Is DTC U1651 a current malfunction?	Go to step 6.	There was something wrong with the meter.
6 CHECK COMBINATION METER. Replace the current combination meter with the original combination meter. Replace the MFD. < Ref. to MULTIFUNCTION DISPLAY (MFD) . > Read the DTC of the MFD using the Subaru Select Monitor. < Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) . >	Is DTC U1651 a current malfunction?	Replace the meter. < Ref. to COMBINATION METER . >	There was an abnormality in MFD.