DTC U1651 Lost Communication With Meter (UART)

DTC DETECTING CONDITION:

UART data from combination meter is not received.

TROUBLE SYMPTOM:

LCD is not displayed.

WIRING DIAGRAM:

Multi-function display (MFD) system <Ref. to WIRING DIAGRAM , Multi-function Display (MFD) System.>

Fig 1: Lost Communication With Meter (UART) Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

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 for LAN system displayed?	Perform the diagnosis of DTCs for LAN system.	Go to step 2.
2 CHECK CONNECTOR. Disconnect the MFD connector and combination 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 displayed? (Current malfunction)	Go to step 3.	There was poor contact of connector.
3 CHECK HARNESS. Disconnect the MFD connector and combination 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 displayed? (Current malfunction)	Go to step 6.	There was something wrong with the combination meter.
6 CHECK COMBINATION METER. Replace the current combination meter with the original combination meter. Replace the MFD. <Ref. to Multi-function Display (MFD) .> Read the DTC of the MFD using the Subaru Select Monitor. <Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) .>	Is DTC U1651 displayed? (Current malfunction)	Replace the combination meter. <Ref. to Combination Meter .>	There was an abnormality in MFD.