Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Ignition Key Registration
2003 Toyota PriusSECTION Ignition Key Registration
NOTE:
This procedure MUST BE performed ONLY when NEW Engine Control Module (ECM) is installed. A new ECM is in automatic registration mode. On Avalon, Camry Solara, Land Cruiser and MR2 up to 4 ignition key identification codes be may registered in the ECM at one time. On Camry models produced from January 2003 and later, Highlander and 4Runner, only up to 4 ignition key codes can be made: 3 master ignition key identification codes and 1 sub-key ignition key identification code may be registered in the ECM at one time. On Camry models produced before January 2003, RAV4, Sequoia and Sienna, up to 3 ignition key identification codes may be registered in the ECM at one time. For all models except Camry models produced after January 2003, Land Cruiser and 4Runner, in automatic registration mode, the last ignition key to be registered becomes the sub-key. For Camry models produced after January 2003 and 4Runner, the registration order is not specified because the transponder key ECU can distinguish keys types. On Land Cruiser, master and sub-key codes are registered automatically.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.