This procedure covers the removal and replacement of the heated seat module on a 2021-2024 Ford F-150 with 3.5L EcoBoost engine, typically located under the driver or passenger seat.

Warnings

Tools required

Parts

• Heated seat control module × 1 — Use OEM Ford specification - verify part number matches existing module
• Electrical connector dielectric grease × 1 — Motorcraft XG-3-A or equivalent

Preparation

1. Park vehicle on level surface and engage parking brake
2. Disconnect battery negative terminal using 10mm socket
3. Wait at least 2 minutes for airbag system capacitors to fully discharge
4. Move seat fully rearward for easier access to front mounting bolts, then move seat fully forward for rear access
5. Ensure seat heater switch is in OFF position

Procedure

1. 1

   Disconnect battery ground
   Using a 10mm socket, loosen and remove the battery negative terminal bolt. Move the cable away from the terminal and secure it so it cannot make contact. Wait minimum 2 minutes before proceeding.
   Torque spec

   Battery Terminal Bolts6 Nm (4 lb-ft)
2. 2

   Remove seat track covers
   Locate the plastic covers on the inboard and outboard seat tracks. Using a trim tool, carefully pry up the front and rear cover caps to access the seat mounting bolts. On some models, these covers simply pull up. Set covers aside in a safe location.
3. 3

   Remove seat mounting bolts
   Using a 13mm socket and extension, remove the four seat mounting bolts (two front, two rear) that secure the seat track to the floor. Support the seat assembly while removing the final bolt to prevent the seat from shifting. Each bolt location has a ground contact point that should remain clean.
   Torque spec

   Module Mounting Bolts8 Nm (6 lb-ft)
4. 4

   Disconnect seat electrical connectors
   Tilt the seat backward to access the electrical connectors underneath. Locate all connectors including heated seat, airbag, seat belt pretensioner, and power seat connectors. Press the locking tabs and carefully disconnect each connector. Note the yellow connector is for the airbag system. Leave seat belt buckle connected if possible.
5. 5

   Remove seat from vehicle
   With all electrical connections disconnected, carefully lift the seat assembly from the vehicle. The seat weighs approximately 50-70 lbs depending on options. Place the seat on a clean, padded work surface with the bottom facing up. Use caution not to damage any wiring harnesses hanging from the seat.
6. 6

   Remove seat bottom cushion cover
   With seat inverted, locate the hog ring clips or J-clips securing the seat cushion cover to the seat frame around the perimeter. Use hog ring pliers or needle nose pliers to remove clips. Carefully pull the seat cover away from the foam cushion to access the heating element and module. The heating element mat is typically embedded in or attached to the bottom of the foam.
7. 7

   Locate heated seat module
   The heated seat control module is typically mounted to the seat frame on the inboard side, near the front or rear of the seat pan. It is a small rectangular module (approximately 3x4 inches) with two or three electrical connectors. On some configurations, it may be combined with the memory seat module. Identify the module and trace the wiring to confirm correct component.
8. 8

   Disconnect module electrical connectors
   Press the locking tab on each electrical connector attached to the heated seat module and carefully pull the connector straight away from the module. There are typically two connectors: one from the heating element and one from the vehicle harness. Note the connector orientation for reassembly.
9. 9

   Remove heated seat module
   Using an 8mm socket, remove the mounting bolts securing the heated seat module to the seat frame bracket. There are typically two bolts. Carefully remove the module from the mounting location. Inspect the mounting bracket for damage or corrosion.
   Torque spec

   Module Mounting Bolts8 Nm (6 lb-ft)
10. 10

    Install new heated seat module
    Position the new heated seat module in the mounting location on the seat frame bracket, ensuring proper orientation. Install the module mounting bolts finger-tight first, then torque to specification using a torque wrench. Ensure the module sits flat against the mounting surface.
    Torque spec

    Module Mounting Bolts8 Nm (6 lb-ft)
11. 11

    Reconnect module electrical connectors
    Apply a small amount of dielectric grease to the connector terminals if moisture exposure is suspected. Connect the electrical connectors to the new module, ensuring each connector clicks into place and the locking tab fully engages. Gently tug each connector to verify it is secure.
12. 12

    Reinstall seat cushion cover
    Carefully reposition the seat cushion cover over the foam pad, ensuring the heating element remains properly positioned and is not pinched or folded. Reinstall the hog rings or J-clips around the perimeter to secure the cover to the seat frame. Ensure even tension and no wrinkles that would indicate misalignment.
13. 13

    Reinstall seat in vehicle
    With assistance if needed, carefully position the seat assembly back into the vehicle, aligning the seat track mounting holes with the floor bolt holes. Be careful not to pinch any wiring harnesses. Reconnect all electrical connectors under the seat, ensuring each connector locks securely. Verify the yellow airbag connector is fully seated.
14. 14

    Install seat mounting bolts
    Install all four seat mounting bolts finger-tight first to ensure proper alignment. Once all bolts are started, torque each bolt to specification in a cross pattern (front left, rear right, front right, rear left) using a torque wrench. Ensure ground contact surfaces between seat frame and floor are clean and making good contact.
    Torque spec

    Module Mounting Bolts8 Nm (6 lb-ft)
15. 15

    Reconnect battery and test system
    Reconnect the battery negative terminal and torque the terminal bolt to specification. Start the vehicle and allow it to complete any system initialization. Test the heated seat function on all heat settings (low, medium, high) and verify proper operation. Check for any diagnostic trouble codes using a scan tool if available.
    Torque spec

    Battery Terminal Bolts6 Nm (4 lb-ft)

Reassembly

1. Reinstall seat track covers by pressing firmly until they snap into place
2. Cycle the seat through full range of motion (forward/back, up/down if power seats) to verify no interference with wiring or mounting
3. Test all seat functions including lumbar, memory settings if equipped, and seat belt buckle operation
4. Clear any stored trouble codes related to seat systems if they do not auto-clear after successful operation

Verification

• Turn ignition to ON position and verify no airbag warning lights remain illuminated
• Test heated seat function on all heat levels - low, medium, and high settings should produce noticeably different heat outputs
• Verify heated seat indicator lights function correctly on the switch when activated
• Check that heated seat reaches operating temperature within 2-3 minutes on high setting
• Ensure no unusual odors or smoke from seat assembly during operation
• Verify seat mounting is secure with no movement or noise when rocking the seat
• Scan for diagnostic trouble codes - no codes related to heated seat or restraint systems should be present

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