GM Service Manual Online
For 1990-2009 cars only
  1. Operate the seat control switch until one adjuster reaches the full forward position.
  2. Disconnect the horizontal drive cable from the adjuster that has reached the full forward position.
  3. Operate the seat forward until the other adjuster reaches the full forward position.
  4. Connect the horizontal drive cable.
  5. Inspect the seat for correct horizontal travel.