This procedure covers the removal and replacement of the heated seat module on a 2016-2021 Honda Civic with 1.5L turbo engine, including seat removal and electrical connector servicing.

Warnings

Tools required

Parts

• Heated seat module × 1 — Use OEM specification for specific seat position
• Seat mounting bolt seals (if damaged) × 4 — Use OEM specification

Preparation

1. Park vehicle on level surface and engage parking brake
2. Turn ignition off and remove key/fob from vehicle
3. Open driver's door and lower driver's window to maintain interior access
4. Move seat to full forward position for easier access to rear mounting bolts
5. Gather all tools and new heated seat module before beginning

Procedure

1. 1

   Disconnect battery and wait
   Disconnect the negative battery terminal using a 10mm socket. Tighten the terminal away from the battery post. Wait at least 3 minutes to allow the SRS system capacitors to fully discharge before proceeding.
   Torque spec

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

   Remove seat trim covers
   Use trim removal tools to carefully pry up the plastic covers at the front and rear of the seat rails on both sides. These covers protect the seat mounting bolts. Set covers aside in a clean location.
3. 3

   Remove seat mounting bolts
   Using a 14mm socket, remove the four seat mounting bolts (two at front, two at rear). The rear bolts may require moving the seat to the full forward position for access. Keep bolts and any washers/seals organized.
   Torque spec

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

   Tilt and access seat connectors
   Carefully tilt the seat backward to access the underside. Have an assistant support the seat weight. Locate all electrical connectors under the seat including the heated seat module connector, seat position sensor, and airbag connector (if equipped).
5. 5

   Disconnect electrical connectors
   Press the locking tabs and disconnect all electrical connectors under the seat. Note the yellow connector is the airbag circuit. The heated seat connector is typically gray or black with 4-6 pins. Take a photo before disconnecting to aid reassembly.
   ⚠Handle yellow airbag connectors with care and do not probe or force connections
6. 6

   Remove seat from vehicle
   With all connectors disconnected, carefully lift the seat assembly out of the vehicle. Use proper lifting technique and/or assistance. Place seat upside down on a clean, padded work surface to access the bottom cushion.
7. 7

   Remove seat cushion retaining clips
   Locate the retaining clips or hog rings securing the seat cushion fabric to the seat frame around the perimeter. Use a flathead screwdriver or trim tool to release these clips. You only need to release the front and side clips to access the heated seat module.
8. 8

   Access heated seat module
   Carefully pull back the seat cushion fabric and foam padding to expose the heated seat element and module. The module is typically a small black box (approximately 3x4 inches) mounted to the seat frame or attached to the heating element with mounting screws or clips.
9. 9

   Remove old heated seat module
   Disconnect the wiring harness from the heated seat module by pressing the connector locking tab. Remove the module mounting bolts using a 10mm socket. If module is adhered with tape or clips, carefully separate it from the seat frame or heating element pad.
   Torque spec

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

    Install new heated seat module
    Position the new heated seat module in the exact location as the old unit. Ensure the heating element connector is properly oriented. Install and torque the module mounting bolts to specification. Reconnect the wiring harness to the module ensuring a positive click.
    Torque spec

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

    Reinstall seat cushion
    Carefully reposition the foam padding and seat cushion fabric over the heating element and new module. Ensure no wires are pinched. Reinstall all retaining clips or hog rings in their original positions to secure the cushion to the frame.
12. 12

    Reinstall seat in vehicle
    With assistance, lift the seat assembly and position it over the four mounting points in the vehicle. Route all wiring harnesses to avoid pinching. Reconnect all electrical connectors in the reverse order of removal, ensuring each connector locks with an audible click.
13. 13

    Secure seat mounting bolts
    Install the four seat mounting bolts with any original washers or seals. Hand-thread all four bolts first, then torque to specification in a cross pattern (front left, rear right, front right, rear left) using a 14mm socket and torque wrench.
    ⚠Properly torqued seat bolts are critical for occupant safety in a collision
    Torque spec

    Module Mounting Bolts8 Nm (6 lb-ft)
14. 14

    Reinstall trim covers
    Snap the plastic trim covers back into place over all four seat mounting bolt locations. Ensure they are fully seated and flush with the carpet.
15. 15

    Reconnect battery and clear codes
    Reconnect the negative battery terminal and torque to specification using a 10mm socket. Turn the ignition to ON position (do not start) and verify no airbag warning lights remain illuminated after the initial bulb check (approximately 6 seconds).
    Torque spec

    Battery Terminal Bolts6 Nm (4 lb-ft)

Reassembly

1. Ensure all electrical connectors are fully seated with locking tabs engaged
2. Verify seat moves freely on rails without interference from wiring
3. Check that seat mounting bolts are torqued to specification for safety
4. Confirm all trim covers are properly reinstalled

Verification

• Start the vehicle and verify no airbag warning light on the instrument cluster
• Turn on the heated seat switch and verify the indicator light illuminates on the switch
• Allow heated seat to run for 2-3 minutes and verify seat cushion becomes warm to the touch
• Test all seat adjustment functions (fore/aft, recline, height if equipped) to ensure proper operation
• If airbag light remains on, use a scan tool to check for stored codes and verify all connectors are properly seated

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