GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

    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: 276746  Size: SH
  1. Disconnect the negative battery cable.
  2. Disconnect the electrical connector from the pump motor switch relay.
  3. Remove the relay mounting bolt.

  4. Object Number: 258755  Size: SH
  5. Remove the pump relay (1).

Installation Procedure


    Object Number: 258755  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.

  1. Install the pump motor (2).
  2. Install the parking brake pump motor relay (1).
  3. Tighten
    Tighten the electric/auto apply park brake pump motor relay mounting bolt to 13 N·m (115 lb in).

  4. Connect the electrical connector to the pump relay.
  5. 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.

  6. Connect the negative battery cable.