GM Service Manual Online
For 1990-2009 cars only

Manual Seat Adjuster Does Not Unlock for GMC Truck TopKick C-Series (Conventional) C4/C5 2003

Problem

Action

The locking wire is too loose.

Tighten the locking wire.

The locking wire is disconnected or broken.

Repair or replace the locking wire.

The adjuster lock bar is sticking or binding.

Lubricate the lock bar pivot.