Lumbar Pump Replacement

Lumbar Pump Replacement

Removal Procedure

The 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 and #4 to aid in assembly.

1. Raise the seat to the full up position.
2. Remove the seat. Refer to Seat Replacement (Seat Replacement) .
3. Remove the seat cushion cover. Refer to Driver Seat Cushion Pad Replacement (Driver Seat Cushion Pad Replacement) or to Passenger Seat Cushion Pad Replacement (Passenger Seat Cushion 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 air hoses (1) that connect the control module to the bladder 75 mm (3 in) from the control module (5).
9. Remove the pump (4) and the control module (5) as an assembly.



Installation Procedure





1. Lay the new pump and control module assembly on top of the seat spring assembly.
2. Apply a very small amount of air to each of the 2 lumbar bladder hoses. Perform the procedure in the next step based upon the following information:

* If the upper lumbar inflates, connect that hose to the hose labeled #3 on the new pump.
* If the lower lumbar inflates, connect that hose to the hose labeled #4 on the new pump.





3. Using Loctite(TM) 406, or equivalent, glue each hose to the fitting (2) in the module hose.

1. Position the hose 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.





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 Driver Seat Cushion Pad Replacement (Driver Seat Cushion Pad Replacement) or to Passenger Seat Cushion Pad Replacement (Passenger Seat Cushion Pad Replacement) .
9. Install the seat. Refer to Seat Replacement (Seat Replacement) .