GM Service Manual Online
For 1990-2009 cars only

Downstop Adjustment

  1. Turn pump bypass valve to open position (full clockwise).
  2. Lower folding top by hand.
  3. Lay straightedge level across rearmost edge of side rail garnish moldings with straightedge level extending to left and right edges of vehicle.
  4. Reposition plastic splash shield to allow access to downstop bolts/screws.

  5. Object Number: 386056  Size: MH
  6. Loosen downstop bolts/screws.
  7. Adjust octagonal downstop cams so that folding top is level from left to right along straightedge level and allows sufficient clearance for boot cover to be installed
  8. Tighten
    Tighten the downstop bolts/screws to 17 N·m (13 lb ft).

  9. Remove straightedge level.
  10. Turn pump bypass valve to closed position (full counterclockwise).
  11. Perform upstop adjustment if necessary as outlined in the procedure below, otherwise raise top (automatically).

Upstop Adjustment

  1. Turn pump bypass valve to open position (full clockwise).
  2. Lower folding top by hand.

  3. Object Number: 386056  Size: MH
  4. Turn upstops all the way in (clockwise).
  5. Raise (manually) and latch folding top.
  6. With top latched, turn each upstop counterclockwise (out) until they contact pivot bracket.
  7. Lower folding top (manually).
  8. Turn upstops out of outer arm an additional 1/4 of a turn.
  9. Tighten
    Tighten the jamb nut on upstops to 17 N·m (13 lb  ft).

  10. Turn pump bypass valve to closed position (full counterclockwise).
  11. Raise and latch convertible top.