Lumbar Support Description and Operation (with A45, Memory Seat): Horizontal

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora and 2001 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

When the lumbar switch is operated to move the lumbar support forward, battery positive voltage (B+) is applied through the switch contacts and the driver seat lumbar forward switch signal circuit to the MSM. In response to this signal, the MSM applies battery positive voltage (B+) through the lumbar motor forward control circuit and ground through the lumbar motor rearward control circuit to the horizontal motor. The motor runs to drive the lumbar support forward toward the occupant's back until the switch is released. Moving the lumbar support rearward works similarly to moving the lumbar support forward, except that battery positive voltage (B+) and ground are applied on the opposite circuits causing the motor to run in the opposite direction. The MSM also controls the lumbar horizontal motor during memory recall functions.