Seat Heater Element

This procedure covers the removal and replacement of a faulty seat heater element in a 2025 Rivian EDV 500, requiring partial disassembly of the seat upholstery and cushion.

Warnings

Tools required

Parts

• Seat heater element pad × 1 — Use OEM specification for specific seat position
• Hog rings × 12 — Stainless steel upholstery clips
• Wiring harness connector (if damaged) × 1 — Use OEM specification
• Seat cushion clips × 4 — Replace any broken clips

Preparation

1. Park vehicle on level surface and engage parking brake
2. Disconnect 12V auxiliary battery negative terminal using 10mm wrench
3. Wait minimum 5 minutes for airbag system capacitors to discharge
4. Move seat to full forward position for easier access to rear mounting bolts
5. Ensure seat heater switch is in OFF position
6. Identify which seat position requires heater element replacement

Procedure

1. 1

   Remove seat from vehicle
   Locate the four seat mounting bolts at the corners of the seat track assembly. Use T40 Torx driver to remove the front two bolts, then slide seat fully rearward. Remove the rear two mounting bolts. Disconnect the electrical connectors under the seat, including the seat heater connector, seat position sensor, and occupancy sensor (if equipped). Carefully lift seat from vehicle and place on protected work surface.
2. 2

   Remove seat back plastic covers
   Use trim removal tools to carefully pry off the plastic cover at the base of the seat back where it meets the cushion. This cover conceals the upholstery attachment points. Remove any visible Torx screws (typically T20 or T30) securing trim pieces. On Rivian seats, there may be side panel covers that snap into place - gently release these clips working from bottom to top.
3. 3

   Release seat cushion upholstery
   Turn the seat upside down to access the underside of the seat cushion. Locate the hog rings securing the upholstery to the seat frame. Using hog ring pliers, carefully remove hog rings around the perimeter of the seat cushion. Count and note the number and positions of rings for reinstallation. Gently pull upholstery away from the foam cushion, working slowly to avoid tearing material.
   ⚠Do not force upholstery removal as Rivian seats may have adhesive backing in addition to hog rings. Use heat gun on low setting to soften adhesive if present.
4. 4

   Disconnect heater element wiring
   Locate the seat heater element connector within the seat cushion foam. Trace wiring from the main harness connector under the seat to the heating element. Disconnect the element connector and carefully note wire routing through foam channels. Use multimeter to confirm the faulty element by checking resistance - a working element should read 3-8 ohms depending on seat size. Open circuit or very high resistance confirms element failure.
5. 5

   Remove foam cushion from seat frame
   Locate clips or fasteners securing the foam cushion to the metal seat frame. On Rivian EDV seats, these are typically plastic push-clips at four to six points around the frame. Use panel pry tool to carefully release clips without breaking them. Lift foam cushion away from frame, keeping track of any spacers or shims that may be present between foam and frame.
6. 6

   Remove failed heater element from foam
   The heater element is typically adhered to the bottom of the seat foam or embedded in a foam pocket. Carefully peel back or separate the element from the foam. Rivian heater elements are carbon fiber mats with integrated wiring. Note the exact position, orientation, and routing of wires through the foam. If the element is in a fabric pocket sewn into the foam, you may need to open a seam to extract it.
   ℹ️Mark the front/rear and left/right orientation of the old element with tape or marker before removal to ensure correct installation of replacement.
7. 7

   Prepare foam cushion for new element
   Clean the mounting surface on the seat foam where the new element will be installed. Remove any residual adhesive from the old element using isopropyl alcohol. Inspect foam for damage, tears, or compression that could affect heater performance. If the element sits in a foam channel or pocket, ensure the channel is clean and clear of debris.
8. 8

   Install new heater element
   Position the new heater element in the seat foam in the exact location and orientation of the original element. Ensure the wiring connector end is positioned for easy routing to the harness location. If the element has adhesive backing, remove the protective liner and carefully press element into place, working from center outward to avoid air bubbles. If using separate adhesive, apply per OEM specifications in a well-ventilated area. Route wiring through foam channels following original path.
   ⚠Ensure heater element lies completely flat with no wrinkles or folds, as these create hot spots that can cause premature failure or burn hazards.
9. 9

   Test new heater element
   Before reassembling seat, connect the new heater element to its wiring harness connector. Temporarily reconnect the main seat harness under the seat. Reconnect the 12V battery. Turn ignition to ON position and activate seat heater to level 1. Use multimeter or temperature probe to verify element is drawing current and generating heat. Monitor for 2-3 minutes to ensure even heating across element surface. Disconnect battery again before proceeding.
10. 10

    Reinstall foam cushion to seat frame
    Position the foam cushion back onto the metal seat frame, aligning any locating pins or guides. Reinstall spacers or shims if they were present. Secure foam to frame using the original plastic push-clips or replacement clips if originals were damaged. Ensure foam sits evenly on frame without gaps or misalignment. Verify heater wiring is not pinched between foam and frame.
11. 11

    Reattach seat upholstery
    Route the heater element wiring connector through the upholstery material following the original path. Position upholstery over the foam cushion, ensuring correct alignment with all seams and contours matching properly. Starting at the front center, stretch upholstery to the frame and secure with new hog rings using hog ring pliers. Work around the perimeter, maintaining even tension to avoid wrinkles. Install hog rings at the same locations and quantity as original installation.
12. 12

    Reinstall trim covers and seat back components
    Reattach the plastic covers at the base of the seat back and any side panel trim pieces removed during disassembly. Ensure all clips are fully seated and any Torx screws are reinstalled. Verify all trim pieces are flush and secure with no gaps or rattles.
13. 13

    Reinstall seat in vehicle
    Position seat assembly over mounting points in vehicle. Reconnect all electrical connectors under the seat: seat heater connector, occupancy sensor, and seat position sensor. Ensure connectors are fully seated with audible clicks. Slide seat fully rearward and install rear mounting bolts finger-tight with T40 Torx driver. Slide seat fully forward and install front mounting bolts finger-tight. Tighten all four mounting bolts in a cross pattern to ensure even seating. Note: Torque specifications not available in database - tighten securely to manufacturer specification.
14. 14

    Reconnect battery and clear fault codes
    Reconnect the 12V auxiliary battery negative terminal. Enter the vehicle and cycle the ignition to ON position. Check the instrument cluster for any seat-related warning lights or messages. If fault codes are present for the seat heater system, use the Rivian app or service mode to clear codes after verifying repair is complete.

Reassembly

1. Ensure all electrical connectors are fully seated and locked before reinstalling seat
2. Verify seat upholstery is smooth and properly tensioned with no wrinkles that could indicate misaligned heater element
3. Test seat movement in all positions to ensure no interference with heater wiring
4. Confirm seat mounting bolts are tightened securely and seat does not shift or rock when occupied

Verification

• Turn ignition to ON and activate seat heater to level 1 (low). Wait 2-3 minutes and verify warmth is evenly distributed across seat cushion with no cold spots
• Increase heater to level 2 (medium) and then level 3 (high), verifying proper operation at each level
• Check that seat heater indicator light on switch illuminates at each setting
• Verify no burning smell or excessive heat in any localized area
• Confirm no warning lights or fault messages appear on instrument cluster related to seat heater system
• Test seat position adjustment controls and verify heater continues to function during seat movement
• Perform a test drive to ensure seat heater maintains temperature and functions normally under vehicle operation

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