Toyota Sienna Forum - siennachat.com banner

1 - 2 of 2 Posts

·
Registered
Joined
·
21 Posts
Discussion Starter #1
I bought a 4D-67 key, cut and programmed it. It worked well for a month. (2008 Sienna)

All of the sudden, that new key won't start the car since the car isn't recognizing the chip for the immobilizer (key icon still blinking on the dash). Original master key works great.

I tried wiggling the key in the cylinder lock to make a contact, it doesn't do anything. Randomly though it will recognize the key and the blinking key light goes away.
I tried reprogramming the key: I can get into programming mode but the car doesn't see a chip to be programmed when I insert the key.

Do those transponder have a battery or something that can explain the intermittent connection with the car? Thanks.
 

·
Super Moderator
2015 Sienna Limited Premium
Joined
·
5,168 Posts
Assuming it's a real copy of a Toyota key (or an actual Toyota transponder key), then no, the immobilizer is an RF powered chip. No battery. When you insert it into the ignition, an electric field powers the little wedge shaped assembly and it broadcasts a code.
 
  • Like
Reactions: supra129
1 - 2 of 2 Posts
Top