GM Service Manual Online
For 1990-2009 cars only
  1. With the vehicle still raised, rotate the neutral start and back-up lamp switch back and forth until a central position is attained, then lightly tighten the front bolt to retain.
  2. With the ignition switched to the on position, check that the engine can only be started in both the Park and Neutral selector positions. A further minor adjustment may be required to achieve this state. Also check that the Reverse lamps illuminate with the Reverse range is selected.
  3. Important: To gain access to the rear screw, it will be necessary to remove the wiring harness connector, once again.

    Notice: All fasteners are important attaching parts as they affect the performance of vital components and/or could result in major repair expense. Where specified in this section, fasteners must be replaced with parts of the same part number or an approved equivalent. Do not use fasteners of an inferior quality or substitute design.

    Torque values must be used as specified during reassembly to ensure proper retention of all components.

    Throughout this Section, fastener torque wrench specifications may be accompanied with the following Identification marks:

    + Fasteners must be replaced after loosening.

    * Fasteners either have micro encapsulated sealant applied or incorporate a mechanical thread lock and should only be re-used once. If in doubt, replacement is recommended.

    ! Fasteners must not be final tightened until vehicle is at curb height with the vehicle weight on all four wheels.

    # Fasteners must be new and assembled dry.

    If one of these identification marks is present alongside a fastener torque wrench specification, the recommendation regarding that fastener must be adhered to.

  4. After the switch has been adjusted, tighten the switch attaching screws to the correct torque specification.
  5. Tighten
    Tighten the neutral start and back-up lamp switch retaining screw to 25 N·m.

  6. Following the bolts tightening procedure, reinstall the connector/s and CPA securing pin/s.
  7. Lower the vehicle to the ground and check the operation of the neutral start and back-up lamp switch. The vehicle should only start in either Park or Neutral positions and the reverse lamps should only illuminate when Reverse is selected.