Check for a Loose Connector on the Subaru

This bulletin applies to 2019 Subaru Forester vehicles. The DMS (driver monitoring system) may be inoperative.

DTC U0156 for lost communication may be stored in multiple modules. In addition, the seat memory feature may be inoperative. The cause may be a loose harness connector located behind the exterior trim cover of the driver’s door mirror assembly. The upper and lower covers may be carefully removed using a plastic trim tool . With the covers removed, access to this connector is much easier by removing the turn signal lamp from the mirror housing. After re-seating the connector and confirming that it is locked in place, all systems should return to normal. When removing the mirror overs, remove the lower cover first, then the upper. During re-installation, install the top first, then the lower.

This view provides an example with the mirror housing removed for access.
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.

About the Author

Mike Mavrigian | Editor

Mike received a BA degree from Youngstown State University in English Literature with a minor in Journalism in 1975.