This procedure covers the removal and replacement of the heated seat module located under the driver or passenger seat on a 2015-2020 Ford F-150 with 3.5L EcoBoost engine.

Warnings

Tools required

Parts

• Heated seat control module × 1 — Use OEM specification
• Module connector seals (if damaged) × 1 — Use OEM specification

Preparation

1. Position seat mid-travel (forward/back) and at highest position for best access to underside
2. Disconnect negative battery terminal and wait minimum 2 minutes for airbag system capacitor discharge
3. Note seat heating settings or fault codes if performing diagnostic work
4. Ensure ignition is OFF and key is removed from vehicle

Procedure

1. 1

   Access Seat Underside
   Carefully tilt the seat forward or access from the rear of the seat to view the underside. The heated seat module is typically mounted to the seat frame rail on the outboard side. You may need to remove plastic covers or shields attached to the seat bottom frame.
2. 2

   Locate Heated Seat Module
   Identify the heated seat control module - a small rectangular electronic module approximately 3x4 inches with two or three electrical connectors. It will be mounted to the seat frame with mounting bolts. Note the connector positions and wire routing for reinstallation.
3. 3

   Disconnect Electrical Connectors
   Locate the locking tabs on each electrical connector. Press the release tab while gently pulling the connector straight away from the module. There are typically 2-3 connectors: one for the seat heating element, one for power/ground, and one for the seat temperature sensor. Mark or photograph connector positions if not clearly different sizes.
   ⚠Release locking tabs completely before pulling connectors to avoid breaking the tabs.
4. 4

   Remove Module Mounting Bolts
   Using a 10mm socket, remove the module mounting bolts securing the heated seat module to the seat frame. Typically there are 2-3 bolts. Support the module while removing the last bolt to prevent it from falling.
   Torque spec

   Module Mounting Bolts8 Nm (6 lb-ft)
5. 5

   Remove Old Module
   Carefully remove the heated seat module from its mounting location. Inspect the mounting bracket and connectors for damage, corrosion, or debris. Clean mounting surface if necessary.
6. 6

   Install New Module
   Position the new heated seat module onto the seat frame mounting bracket, aligning the bolt holes. Ensure the module is oriented correctly with connectors accessible and wiring will not be pinched. Start all mounting bolts by hand before tightening.
7. 7

   Torque Module Mounting Bolts
   Using a torque wrench, tighten the module mounting bolts to specification in a cross pattern if multiple bolts are present. Ensure module is secure and does not move when gently pulled.
   Torque spec

   Module Mounting Bolts8 Nm (6 lb-ft)
8. 8

   Reconnect Electrical Connectors
   Connect all electrical connectors to the heated seat module in their original positions. Push each connector firmly until you hear or feel the locking tab click into place. Gently pull on each connector to verify it is locked. Ensure wiring is routed away from moving seat components and sharp edges.
   ⚠Verify each connector is fully seated and locked - partial connections will cause system faults.
9. 9

   Reinstall Seat Covers or Shields
   If any plastic covers or shields were removed from the seat bottom, reinstall them ensuring they do not interfere with seat movement or pinch wiring.
10. 10

    Reconnect Battery
    Reconnect the negative battery terminal to the battery post. Tighten the terminal bolt to specification, ensuring good contact but not overtightening the soft lead terminal.
    ⚠Do not overtighten battery terminals as this can damage the terminal or battery post.
    Torque spec

    Battery Terminal Bolts6 Nm (4 lb-ft)

Reassembly

1. Verify all electrical connectors are fully seated and locked
2. Ensure no wiring is pinched or routed near moving seat components
3. Check that seat moves freely in all directions without binding on module or wiring

Verification

• Turn ignition to ON position (engine off) and test heated seat operation at multiple heat settings
• Verify heated seat indicator lights illuminate on instrument cluster or seat switch
• Allow seat heater to warm for 2-3 minutes and confirm seat cushion is warming evenly
• Check for any fault codes related to seat heating system using diagnostic scanner if available
• Verify no airbag warning lights are illuminated on instrument cluster
• Test seat adjustment in all directions to ensure no interference with new module

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