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Toyota (20-24) EV Steering Wheel Transceiver, Clockspring, Spline Adapter

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Toyota Steering Wheel

Toyota (20-24) EV Steering Wheel Transceiver, Clockspring and Spline Adapter.

Personal project for extending compatibility with my 2003 Toyota Corolla, including extended functionality for the buttons, paddles and horn

Development Progress

Models:

  • Spline adapter: Complete
  • Clockspring: Complete

PCB:

  • Steering wheel transceiver: Complete
  • Car transceiver: Complete

Firmware:

  • Steering wheel transceiver: In Progress
  • Clockspring transceiver: In Progress

Material List

Crimps

  • FDD1.25-250 (Horn Tab)
  • RV1.25-4 (Ground)
  • MDD1.25-187 and FDD1.25-187 (Power Connection)

Screws

  • M5x12mm Flat Head Nut & Bolt

Splicing

  • 2.5 - 3mm Diameter Heat Shrink
  • Solder, and Soldering Iron
  • Wire Strippers and/or Wire Cutters

Connectors

  • 24 pin ATX cable (24-pin Molex Mini-Fit Jr.™)
  • 16 pin IDC cable
  • Also for the PCBs:
    • Sparkfun ATX Power Supply Connector - Right Angle (PRT-09498)
    • Two 7x1 Pin Headers (Female and Male) or just cut to size

Airbag Connector

  • Typically the airbag inflator on the new steering wheel will use 1 or 2 connectors based on the 3 variations of the AK2 Squib Connector.
    • In my case, the Toyota EV steering wheel airbag inflator used a single Code 2 (Blue/Green) AK2 Squib Connector.
    • You can find each individual connector here: Link to Molex PDF
  • You can source these connectors either by:
    • Buying the same clockspring used with the new steering wheel (Toyota)
    • Buying a third party clockspring from older cars that happen to use the same connector (Kia, Hyundai, GM in some cases).

Microcontrollers

  • Xiao ESP32-C3 - Mounted inside the steering wheel
  • Xiao ESP32-S3 - Mounted in the car, below the clockspring

Custom PCBs

  • Ordered on JLCPCB
  • Please take a look in the hardware directory:
    • Steering Wheel Transciever
    • Car Transciever

Spline Adapter

  • Required to fit the steering wheel on older cars (tested working with 2003 Toyota Corolla).
  • Ordered on IN3DTEC (Maraging Steel, Bead blasted)

Clockspring

  • Provides wiring for the airbag and repurposed horn cable (12V Power)
  • Printed locally using Bambu P1S (White ABS, 0.2mm nozzle)
  • You must also purchase the clockspring used with the old steering wheel, as the new clockspring will reuse the spiral ribbon cable and connectors.

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Toyota (20-24) EV Steering Wheel Transceiver, Clockspring, Spline Adapter

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