GM Service Manual Online
For 1990-2009 cars only

Power-Operated Six-Way Seat Adjuster Mechanical Diagnosis Chart

Condition

Possible Cause

Correction

Horizontal Operation of Seat Not Smooth but Jerky-Apparent Hard Operation

Adjuster horizontal actuator

Replace adjuster subassembly.

Horizontal Chuck or Looseness

    • Horizontal actuator improperly adjusted to rack
    • Top plate subassembly looseness
    • Replace adjuster subassembly.
    • Replace adjuster subassembly.

One Adjuster Will Not Operate Horizontally

    • Horizontal drive cable disconnected or damaged.
    • Horizontal actuator inoperative
    • Check horizontal drive cables, replace if damaged.
    • Replace adjuster subassembly.

One Adjuster Will not Operate Vertically

    • Vertical drive cable disconnected or damaged
    • Vertical actuator subassembly
    • Check vertical drive cables, replace if desired.
    • Replace vertical actuator assembly.

Both Adjusters Will Not Operate Horizontally and/or Vertically

    • Damaged or inoperative motor or motors
    • Wiring harness
    • Replace damaged or inoperative motor or motors.
    • Replace wiring harness.

Vertical Chuck or Looseness

Vertical actuator

Replace vertical actuator sub-assembly.