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.
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 has written thousands of automotive technical magazine articles involving a variety ofspecialties, 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.
