GM Service Manual Online
For 1990-2009 cars only

Stop Lamp Switch Adjustment 1st Design

  1. Turn ignition to the Off position.

  2. Object Number: 888497  Size: SH
  3. Remove the left side lower I/P closeout panel, hush panel push pin fasteners and remove the panel.
  4. Remove the left side lower heater duct assembly push pin fastener and remove the duct.
  5. Remove the applicable switch from the bracket by rotating 90 degrees.

  6. Object Number: 885924  Size: SH

    Notice: Do not attempt to adjust switch more than three times. Multiple adjustments of the switch will cause excessive wear on the adjustment mechanism within the switch. If switch has been adjusted more than three times, replace the switch.

    Important: The notch on the plunger will be fully visible when the plunger is fully extended.

    Important: If the witch plunger separates from switch body, do not attempt to re-insert the plunger into switch body. The switch must be replaced.

  7. Fully extend the plunger from the switch housing, this may require moderate force, to prepare the switch for adjustment.

Stop Lamp Switch Adjustment 2nd Design


    Object Number: 885926  Size: SH
  1. Install the applicable switch into the bracket and rotate 90 degrees while holding the brake pedal down.

  2. Object Number: 891943  Size: SH
  3. Adjust the applicable switch by pulling up on the brake or clutch pedal by hand, with moderate force.
  4. Important: Do not pull up on the brake or clutch pedal with excessive force. Adjustment is complete after 2-3 clicks are heard from the switch.

  5. Ensure that the brake lamps and cruise control function as designed.
  6. If either system does not function as designed, re-adjust the appropriate switch using the procedure outlined in this bulletin.
  7. If both systems function properly continue to the next step.

  8. Object Number: 888497  Size: SH
  9. Install the left side lower heater duct and push pin fastener.
  10. Install the left side lower I/P closeout panel, hush panel and push pin fasteners.