Lumbar Pump Replacement First Design

The first design lumbar pump and control module are combined into one unit. The unit is riveted to a bracket under the front of the seat.

1. Remove the seat. Refer to Seat Replacement - Power with Adjuster .
2. Remove the rivet attaching the pump to the front of the bracket.
3. Slide the pump forward disengaging the pump's rear mounting tabs.
4. Disconnect the electrical connectors.
5. Disconnect the air hose connectors.
6. Remove the pump.

1. Connect the electrical connectors to the pump.
2. Connect the air hose connectors to the pump.
3. Attach the pump rear mounting tabs to the underside of the seat.
4. Rivet the front of the pump to the bracket under the front of the seat.
5. Install the seat. Refer to Seat Replacement - Power with Adjuster .

Lumbar Pump Replacement Second Design

The second design lumbar pump and control module are separate units that are attached to each other by a wire harness and a hose. They are supplied and replaced as an assembly. The lumbar pump is contained in a vinyl pouch under the seat and is tie strapped to the seat adjuster torque tube. The attached control module is contained in a vinyl pouch and is secured with J strips to the bottom of the seat support springs. The service part is supplied with connector fittings and the air hoses are labeled #3, #4, and #5 to aid in assembly.

1. Raise the seat to the full up position.
2. Remove the seat. Refer to Seat Replacement - Power with Adjuster .
3. Remove the seat cushion cover. Refer to Seat Cushion Trim Cover and Pad Replacement .



4. Remove the tie straps attaching the pump to the torque tube (4) under the seat.
5. Remove the control module by unhooking the J strips from the seat cushion support wires.



6. Disconnect the electrical connector.
7. Reposition the pump and the lumbar control module from under the seat support wires to on top of the seat support wires.



8. Cut the control module to bladder air hoses (1) 75 mm (3 in) from the control module (5).
9. Remove the pump (4) and the control module (5) as an assembly.

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.




3. Using Loctite™ 406, or equivalent, glue each hose to the fitting on the module.

3.1.	Position the hose so it is just over the edge of the barb on the attaching fitting.

3.2.	Apply the adhesive completely around the fitting.

3.3.	Quickly push the hose the rest of the way onto the fitting.




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.



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 with Adjuster .