FAQS Honda Immobilizer Theft Deterrent System

Frequently Asked Questions

The questions listed below represent a collection of questions commonly asked by new Honda owners and lessees. The responses to these questions represent a shortened version of Honda's official position on these subjects. For a more complete explanation, please review your Owner's Manual or contact your local Honda Dealer.

I'd like some spare keys. Do I need to use Honda key blanks?

If your Honda is not equipped with an Immobilizer Theft-Deterrent System, you may obtain replacement key blanks from after-market suppliers.
Use only Honda-approved key blanks (regardless of where you purchase them).
You should have received a key number plate with your keys. You will need this key number if you ever have to get a lost key replaced. Keep the plate stored in a safe place.
If your Honda is equipped with an Immobilizer Theft-Deterrent System, your keys contain a transmitter in the key head, which signals a control unit to activate the ignition system. Without this signal, your car will not start.
- Protect the keys from direct sunlight, high temperature and high humidity
- Do not drop the keys or set heavy objects on them.
- Keep the keys away from liquids. If they get wet, dry them immediately with a soft cloth.
- The keys do not contain batteries. Do not try to take them apart.
At the time of this writing, your Honda dealer may still be the best (or only) source of replacement Immobilizer key blanks.
- Regardless of where you purchase replacement Immobilizer key blanks, you must bring an original key for use when programming the replacement key.
- If no original keys are available for programming purposes, you must replace the Immobilizer control unit (for Prelude models only).

How does this Immobilizer Theft-Deterrent System work?

The Immobilizer Theft-Deterrent System protects your vehicle from theft. A properly coded ignition key must be used in the ignition switch for the engine to start. If an improperly coded key (or other device) is used, the engine's starting circuit is disabled.
When you turn the ignition switch to ON (II), the Immobilizer Theft-Deterrent System indicator light should come on for a few seconds, then go out. If the indicator starts to blink, it means the system does not recognize the coding of the key. Turn the ignition switch to LOCK (O), remove the key, re-insert it and turn the switch to ON (II) again.
This indicator will also blink several times when you turn the ignition switch from ON (II) to ACCESSORY (I) or LOCK (O).
- The system may not recognize your key's coding if the key is in contact with a key from another immobilizer system. If you have a key from another vehicle's immobilizer system, keep it separate.
If the system repeatedly does not recognize the coding of your key, contact your Honda dealer.
Do not attempt to alter this system or add other devices to it. Electrical problems could result that may make your vehicle inoperable.