GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Saturn 🢒 2007 🢒 ION 🢒 Power and Signal Distribution 🢒 Wiring Systems and Power Management 🢒 Ambient Light Sensor Replacement

Removal Procedure

    Object Number: 877765 Size: SH
  1. Remove the left and right outer trim covers. Refer to Instrument Panel Outer Trim Cover Replacement.

    2. Object Number: 877771 Size: SH
  2. Pull out on the accessory trim plate in order to release the retaining fasteners.

    3. Object Number: 877774 Size: SH
  3. Disconnect the accessory trim plate electrical connectors.

    4. Object Number: 877802 Size: SH
  4. Remove the screw retaining the cluster trim plate to the center trim panel.
  5. Lift up on the cluster trim plate to release the retaining fasteners.
  6. Remove the cluster trim plate.
  7. Remove the left and right windshield garnish moldings. Refer to Windshield Garnish Molding Replacement.

    8. Object Number: 877812 Size: SH
  8. Remove the defroster grille bolt covers.

    9. Object Number: 877803 Size: SH
  9. Remove the defroster grille center bolts and the outer screws.
  10. Lift up on the defroster grille to release the retaining fasteners.

    11. Object Number: 877737 Size: SH
  11. Turn the ambient light sensor body clockwise to remove it from the defroster grille.
  12. Disconnect the ambient light sensor electrical connector.

Installation Procedure

    Object Number: 877737 Size: SH
  1. Connect the ambient light sensor electrical connector.
  2. Install the ambient light sensor to the defroster grille. Turn the ambient light sensor body counterclockwise to lock it into the defroster grille.

    3. Object Number: 877803 Size: SH
  3. Align the defroster grille retaining fasteners with the I/P.
  4. Push on the defroster grille in order to secure the retaining fasteners.

    5. Notice: Refer to Fastener Notice in the Preface section.

  5. Install the defroster grille center bolts.

    6. Tighten
    Tighten the defroster grille center bolts to 10 N·m (88 lb in).

  6. Install the defroster grille outer screws.

    7. Tighten
    Tighten the defroster grille outer screws to 2.5 N·m (22 lb in).


    Object Number: 877812 Size: SH
  7. Install the defroster grille bolt covers.
  8. Install the left and right windshield garnish moldings. Refer to Windshield Garnish Molding Replacement.

    9. Object Number: 877802 Size: SH
  9. Align the cluster trim plate retaining fasteners with the center trim panel.
  10. Push on the outer edge of the cluster trim plate in order to secure the retaining fasteners.
  11. Install the screw retaining the cluster trim plate to the center trim panel.

    12. Tighten
    Tighten the cluster trim plate screw to 2.5 N·m (22 lb in).


    Object Number: 877774 Size: SH
  12. Connect the accessory trim plate electrical connectors.

    13. Object Number: 877771 Size: SH
  13. Align the retaining fasteners with the I/P.
  14. Push on the outer edge of the accessory trim plate in order to secure the retaining fasteners.

    15. Object Number: 877765 Size: SH
  15. Install the left and right outer trim covers. Refer to Instrument Panel Outer Trim Cover Replacement.