Tightening Harness Connector on Subaru

You may encounter a 2019 Subaru Forester where the driver monitoring system (DMS) is inoperative. DTC U0156 for lost communication may be stored in multiple modules. The seat memory feature may also be not working. The root cause may be a loose harness connector located behind the exterior trim cover on the driver’s door mirror assembly.

Information courtesy of Mitchell 1

Mike Mavrigian

Nov. 21, 2022

View shows the turn signal moved out of the way.
|Photo Credit: Mitchell 1

With e covers removed, access to the connector is made easier by removing the turn signal lamp from the mirror housing. Make sure that the connector is fully locked in place. When removing the covers, remove the lower cover first. During reassembly, install the upper cover first.

About the Author

Information courtesy of Mitchell 1

Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.

Mike Mavrigian

Motor Age Editor

Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety of specialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.