GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

  1. Remove rear bumper fascia. Refer to Rear Bumper Fascia Replacement in Bumpers.

  2. Object Number: 489061  Size: SH
  3. Disconnect the electrical connector to the rear object sensor.

  4. Object Number: 500502  Size: SH
  5. Lift the locking tabs on the housing (4) and remove the rear object sensor (1).

  6. Object Number: 489063  Size: SH
  7. Squeeze the spring (1) and remove it from the housing (2).

  8. Object Number: 489064  Size: SH
  9. Release the tabs on the housing and remove.

  10. Object Number: 489066  Size: SH
  11. Remove the bezel by pushing it through the fascia.

Installation Procedure

    Important: Do not refinish a previously painted sensor.

  1. Paint the new rear object sensor. Refer to Basecoat/Clearcoat Paint Systems in Paints and Coatings.
  2. Check the paint thickness to ensure it does not exceed 6 mils using a paint thickness gauge suitable for non-ferrous metals. Refer to Paint Gages in Paints and Coatings.

  3. Object Number: 489066  Size: SH
  4. Install the rear object sensor bezel by pressing the ring in until it is flush with fascia.

  5. Object Number: 500505  Size: SH
  6. Align the keyhole (2) with the key (1) and press the sensor bezel into the fascia.

  7. Object Number: 489064  Size: SH
  8. Install the housing to the bezel through the back side of the fascia. The housing snaps into the cutouts on the bezel.
  9. Important: The spring keys must be on the top and bottom of the housing.


    Object Number: 489063  Size: SH
  10. Install the spring (1) to the housing (2).

  11. Object Number: 500502  Size: SH
  12. Install the decoupling ring (2) to the sensor (1).
  13. Insert the sensor into the housing (4) with the connector pointing toward the passenger side of the fascia. The sensor tabs snap into the cutouts on the housing (4).

  14. Object Number: 489061  Size: SH
  15. Connect the electrical connector.
  16. Install the rear bumper fascia. Refer to Rear Bumper Fascia Replacement in Bumpers.