GM Service Manual Online
For 1990-2009 cars only
    • Inspect the condition of the headlamps, taillamps, turn signals, side lamps, and blackout (B/O) lamps before beginning to operate the vehicle each time.
    • Inspect the axle vent tube filter for blockages every six months and more often when difficult off-road conditions are encountered. Replace as needed. Refer to Front Axle Vent Tube Filter Replacement in Front Drive Axle or Rear Axle Vent Tube Filter Replacement in Rear Drive Axle.
    • Inspect the transfer case vent tube filter for blockages every six months and more often when difficult off-road conditions are encountered. Replace as needed. Refer to Transfer Case Vent Tube Filter Replacement in Transfer Case NVG 261-NP2.