Heated Seat Module

Remove and replace the heated seat control module located under the driver or passenger seat to restore seat heating functionality.

Warnings

Tools required

Parts

• Heated seat control module × 1 — Use OEM specification - A2218702226 or A2218702326
• Dielectric grease × 1 — Small packet

Preparation

1. Park vehicle on level surface and engage parking brake
2. Turn ignition off and remove key from vehicle
3. Disconnect battery negative terminal and wait minimum 10 minutes for SRS system discharge
4. Move seat to full forward position for access to rear mounting bolts
5. Have replacement module and tools ready before disassembly

Procedure

1. 1

   Position seat for access
   Using seat controls, move the seat to the full forward position. This provides access to the rear seat mounting bolts. Make note of the seat position settings if equipped with memory function.
2. 2

   Remove rear seat mounting bolts
   Locate the two rear seat mounting bolts at the rear of the seat rails. Using a Torx T30 or T25 socket (depending on year), remove both rear mounting bolts completely. Set bolts aside in a clean location.
   Torque spec

   Module Mounting Bolts8 Nm (6 lb-ft)
3. 3

   Reposition seat and remove front mounting bolts
   Slide the seat manually to the full rear position to access the front mounting bolts. Remove both front seat mounting bolts using the appropriate Torx socket. The seat assembly is now free from the floor.
   ⚠Seat assembly is heavy (approximately 40-50 kg with mechanisms). Do not attempt to lift seat out alone
   Torque spec

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

   Tilt seat and disconnect main harness
   Carefully tilt the seat backward to access the underside. Locate the main seat wiring harness connector underneath the seat. Press the release tab and disconnect the main harness connector. On some models, there may be multiple connectors - disconnect all electrical connections to the seat.
5. 5

   Remove seat from vehicle
   With all electrical connections disconnected, carefully remove the seat assembly from the vehicle. Place the seat upside down on a clean, padded surface (blanket or cardboard) to prevent damage to the leather and avoid scratching the adjustment controls.
6. 6

   Locate heated seat module
   With the seat inverted, locate the heated seat control module. It is typically mounted to the seat frame near the center of the seat base, housed in a black plastic enclosure approximately 10cm x 8cm x 3cm. The module will have multiple wire connectors attached.
7. 7

   Disconnect module electrical connectors
   Identify all electrical connectors attached to the heated seat module (typically 2-4 connectors including power, ground, heating element connections, and sensor inputs). Press the release tabs and carefully disconnect each connector. Note the position and routing of each connector for reinstallation.
8. 8

   Remove module mounting hardware
   Using a 10mm socket or appropriate Torx driver, remove the module mounting bolts securing the heated seat module to the seat frame. Typically there are 2-3 mounting bolts. Remove the module from the seat frame.
   Torque spec

   Module Mounting Bolts8 Nm (6 lb-ft)
9. 9

   Inspect connectors and wiring
   Inspect all connector terminals for corrosion, burning, or damage. Check the heating element connectors especially for signs of overheating (melted plastic or discolored terminals). Clean connectors with electrical contact cleaner if necessary. Verify ground connections are clean and corrosion-free.
10. 10

    Install new heated seat module
    Position the new heated seat module in the mounting location on the seat frame. Install the module mounting bolts and torque to specification. Ensure the module is securely mounted and properly oriented with connector ports accessible.
    Torque spec

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

    Reconnect module electrical connectors
    Apply a small amount of dielectric grease to connector terminals. Reconnect all electrical connectors to the new module in their original positions. Ensure each connector clicks firmly into place and locking tabs are fully engaged. Verify no wires are pinched or stressed.
12. 12

    Reinstall seat assembly
    Carefully lift the seat assembly and position it over the mounting points in the vehicle. Route the main wiring harness to avoid pinching. Connect the main seat harness connector(s) under the seat, ensuring all connections click securely into place.
13. 13

    Secure seat mounting bolts
    Install the front seat mounting bolts and torque to 46 Nm (34 lb-ft). Slide the seat forward manually, then install and torque the rear mounting bolts to 46 Nm (34 lb-ft). Verify all four mounting bolts are properly torqued and seat is securely attached to floor.
    Torque spec

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

    Reconnect battery and verify operation
    Reconnect the battery negative terminal and torque to specification. Turn the ignition to position II (without starting engine). Test heated seat operation using the seat control switches. Verify the heated seat indicator illuminates and the seat begins warming within 2-3 minutes. Check that all seat functions (movement, memory, lumbar) still operate correctly.
    Torque spec

    Battery Terminal Bolts6 Nm (4 lb-ft)

Reassembly

1. Ensure all electrical connectors are fully seated with locking tabs engaged
2. Verify no wiring is pinched between seat frame and floor pan
3. Test all seat adjustment functions including memory settings after installation
4. Clear any fault codes from the vehicle's system using a diagnostic scanner if warning lights remain illuminated

Verification

• Heated seat indicator light illuminates when activated
• Seat surface becomes noticeably warm within 3-5 minutes of activation
• No warning lights on instrument cluster related to seat systems
• All seat adjustment functions operate normally
• Seat is firmly mounted with no movement or rattling
• No unusual odors from seat when heating system is activated

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