GM Service Manual Online
For 1990-2009 cars only

High Mount Stop Lamp Replacement SUT

Removal Procedure


    Object Number: 1477816  Size: SH
  1. Carefully lower the rear headliner in order to access the electrical connector.
  2. Disconnect the electrical connector from the center high mounted stop lamp (CHMSL).
  3. Remove the 2 screws securing the CHMSL to the exterior rear header garnish molding.
  4. Disconnect the electrical harness grommet from the rear header.
  5. Remove the CHMSL and attached electrical harness.
  6. Remove the foam gasket and discard if damaged.

Installation Procedure


    Object Number: 1477816  Size: SH
  1. Install a new foam gasket.
  2. Install the lamp, with the attached harness, to the rear header.
  3. Secure the electrical harness grommet to the rear header.
  4. Caution: Refer to Fastener Caution in the Preface section.

  5. Install the retaining screws.
  6. Tighten
    Tighten the screws to 3 N·m (26 lb in).

  7. Connect the electrical connector for the CHMSL to the headliner harness.
  8. Re-secure the rear of the headliner.

High Mount Stop Lamp Replacement SUV

Removal Procedure

  1. Remove the liftgate trim panel. Refer to Liftgate Trim Panel Replacement.

  2. Object Number: 803121  Size: SH
  3. Disconnect the electrical connector from the high mounted stop lamp.
  4. Remove the retaining screws.
  5. Remove the grommet from the liftgate.
  6. Remove the lamp, with the attached harness, from the vehicle.

Installation Procedure

  1. Install the lamp, with the attached harness, to the vehicle.

  2. Object Number: 803121  Size: SH
  3. Install the grommet to the liftgate.
  4. Caution: Refer to Fastener Caution in the Preface section.

  5. Install the retaining screws.
  6. Tighten
    Tighten the screws to 3 N·m (26 lb in).

  7. Connect the electrical connector to the high mounted stop lamp.
  8. Install the liftgate trim panel. Refer to Liftgate Trim Panel Replacement.