GM Service Manual Online
For 1990-2009 cars only

Two-Way Manual Seat Adjuster Mechanical Diagnosis Chart

Condition

Possible Cause

Correction

Adjuster Will Not Lock

    • Seat Adjuster handle twisted or bent.
    • Adjuster lockbar return spring broken.
    • Lock sticking or binding on adjuster.
    • Cross bent or hung up.
    • Obstruction or bent lockbar.
    • Crosswire missing or disconnected.
    • Straighten handle to ensure both sides release and lock at the same time or replace.
    • Install new adjuster.
    • Lubricate lockbar pivot with AutoLube A. If lockbar binding, eliminate cause of binding or replace adjuster.
    • Route crosswire correctly or replace crosswire.
    • Connect or replace crosswire.

Seat Hard To Move Forward or Backward

    • Adjusters new, not broken in. (Required break in period 20 cycles).
    • Adjuster(s) improperly lubricated.
    • Adjuster(s) binding due to bent or damaged channels.
    • Adjuster binding due to bearing out of position.
    • Operate seat to full-forward and full-rearward positions several times to work new tightness out of channels.
    • Lubricate adjuster channels with AutoLube A or equivalent.
    • Replace Adjuster.
    • Push on adjuster full-forward (into stops) to rephase.

One Adjuster Track Looks Ahead of The Other Track

Seat System assembled with one track ahead of the other.

  1. Move the seat fully forward.
  2. Remove two assist springs.
  3. Loosen the adjuster to floor and adjuster to seat bolts.
  4. Latch seat in full-forward position and tighten adjuster to floor bolts to 42 N·m (31 lb ft) and the adjuster to seat bolts to 24 N·m (18 lb ft).
  5. Reconnect the two assist springs.