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

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.

The lumbar support system consists of two motors (vertical and horizontal) that operate independently of each other. Each motor contains a electronic circuit breaker (PTC) which will reset only after voltage has been removed from the motor. The lumbar horizontal motor moves the lumbar support in the forward and rearward directions and the lumbar vertical motor moves the lumbar support in the up and down directions. The memory seat module (MSM) provides each motor with a soft stop that will actually stop the motor just before its physical end- of-travel.

This decreases the stress on each motor. If a motor reaches the end-of-travel due a soft stop and the switch is released and pressed again, the lumbar support will move short distance farther to the physical travel limit.