GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2007 🢒 CTS 🢒 Body Systems 🢒 Lighting 🢒 High Intensity Discharge Headlamp Ballast Replacement

Removal Procedure

    Caution: The high intensity discharge system produces high voltage and current. To reduce the risk of severe shocks and burns:

       • Never open the high intensity discharge system ballast or the arc tube assembly starter.
       • Never probe between the high intensity discharge system ballast output connector and the arc tube assembly.

    Caution: The high intensity discharge system produces high voltage and current. In order to reduce the risk of severe shocks and burns, the battery negative cable must be disconnected any time service work is being performed on or around the high intensity discharge system.

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.


    Object Number: 867674 Size: SH
  1. Remove the headlamp. Refer to Headlamp Assembly or Headlamp Bulb and/or Cornering, Sidemarker, Park, Turn Signal Bulb Replacement .
  2. Remove the screws  (1) from the headlamp.

    3. Important:  Be careful when disconnecting the electrical connector.

  3. Disconnect the electrical connector.
  4. Remove ballast  (2) from headlamp.

Installation Procedure

    Object Number: 867674 Size: SH

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

    Important: Always replace the old gasket with the gasket provided with the new ballast .

  1. Install the ballast (2) to the headlamp.

    2. Tighten
    Tighten the ballast screws to 2 N·m (18 lb in).

  2. Install the headlamp. Refer to Headlamp Assembly or Headlamp Bulb and/or Cornering, Sidemarker, Park, Turn Signal Bulb Replacement .