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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 654 (SEAT SYSTEM)REPAIR INSTRUCTIONSLUMBAR PUMP REPLACEMENTINSTALLATION PROCEDURE
1999 GMC Forward Control 5.7 R, Automatic

Installation Procedure

1999 GMC Forward Control 5.7 R, AutomaticSECTION Installation Procedure
WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
  1. Lay the new pump and control module assembly on top of the seat spring assembly.
  2. Apply a very small amount of air (blow into the hose) to each of the three lumbar bladder hoses that were cut in step 8.
    • If the upper lumbar inflates, use the procedure in step three to connect that hose to the hose labeled #3 on the new pump.
    • If the lower lumbar inflates, use the procedure in step three to connect that hose to the hose labeled #4 on the new pump.
    • If the bolsters inflate, use the procedure in step three to connect that hose to the hose labeled #5 on the new pump.
      Fig 1: Connecting Electrical Connector
      G01451707Courtesy of GENERAL MOTORS CORP.
  3. Using Loctite™ 406, or equivalent, glue each hose to the fitting (2) in the module hose.
    1. Position the hose so it is just over the edge of the barb on the attaching fitting.
    2. Apply the adhesive completely around the fitting.
    3. Quickly push the hose the rest of the way onto the fitting.
      Fig 2: Applying Adhesive Completely Around Fitting In Module Hose
      G01451708Courtesy of GENERAL MOTORS CORP.
  4. Insert the pump and the control module down under the seat support wires.
  5. Attach the control module with the J strips facing outward to the underside of the seat cushion support wires.
  6. Connect the electrical connector to the control module.
  7. Tie strap the pump to the torque tube (4) under the front of the seat.
    Fig 3: Tie Straps Attaching Pump To Torque Tube Under Front Of Seat
    G01451709Courtesy of GENERAL MOTORS CORP.
  8. Install the seat cushion trim cover. Refer to SEAT CUSHION TRIM COVER AND PAD REPLACEMENT .
  9. Install the seat. Refer to SEAT REPLACEMENT (POWER)  or SEAT REPLACEMENT (MANUAL) .
    Fig 4: Seat Cushion Trim Cover
    G01451710Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.