Prius (2004-09) :: Immobilizer Light Flashing While Driving


Feb 22, 2016

Today I test drove the car and was told that the key fob was lost and a replacement was programmed for the car to start...but not locks. But while driving it I noted that the Immobilizer / Theft deterrent light was flashing. Is this normal because everything i'm reading says that the car shouldn't even start. I know that the car isn't stolen because we are planning to take over the loan in the morning for the car at the bank. What I should do. If this is because the key was only programmed without the original then can I simply use this one until I can have Toyota make me a new key for around 350-400 based on what I'm seeing online.

Below is the light that i'm referring to (car with key in it).

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I bought a new to me 2005. The car came with one fob with the silver logo. The smart key functionality does not work on the car. Lock and unlock works with the fob and I can start and drive with the fob inserted in the slot. Oddly when I push the black button on the outside of the door the red light flashes on the key fob. I have pressed the button under the steering wheel labeled key and that does not seem to change anything. Pressing the button on the door handle causes a long beep to sound.

In addition the light on the dash that is the car with the black key in the middle constantly flashes. It never turns off while driving. I believe this is the same light that acts as the theft deterrent light. I would think that the two are somehow related.

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So I got my car today (2005) and I love it! I have some questions about it. When I was driving back from the dealership, I was watching the energy screen. The temperature was about 28F and it was mostly highway driving between 65-75 MPH.

During the drive, I kept noticing the yellow arrows flashing on for 500mS, then go off, then come back on in a few seconds. I wasn't able to keep the yellow arrows on consistently. There didn't seem to any sequence to it, it just seemed random. The battery never dropped below 7 bars except when I was going slow and it was always green when I was going slow. Also, the only time the battery went to 8 bars was when I braked hard and that was one time.

I would have thought the car would have used more of the battery to assist but at the same time my MPG was over 50 (51.1 to be exact) so I'm thinking this is normal. Is it?

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Lexus GX 2004-09 :: 2005 470 - Immobilizer / Security Indicator Light Flashes?

2005 GX470.After returning home my wife parked the GX470 in the garage. She returned 30 minutes later and noticed the headlights were on. She also noticed the immoblizer light was blinking.

We always keep the headlights in the "auto" position. Headlights staying on is a little strange. but I recall the lights staying on once or twice before. Immoblizer light flashing has never happened.

I inserted the key and turned to start the car and the light went out and the GX started fine. Once I remove the key, the light starts blinking again. I tried this with both keys to make sure it wasn't a transponder issue--all keys did the same as above.

I checked battery voltage--12.4v. Charging--13.6v at idle Some light corrosion around the negative cable but not too bad. cleaned anyway Wife did say she came out of work and noticed that two different car alarms were going off that were right next to her car. Possible kids messing around. Maybe our car was going off as well?

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Why would I get this all of a sudden? Did something happen to the chip in my key? Could the sensor in the steering column by bad? I don't want to have to load this thing on a trailer and take it to the dealership. Why would this happen out of the blue??

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Owner's manual says call dealer. Car battery is 1 year old and 2 fobs have new batteries, and neither will work.

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I went back out to the car and messed around a little bit. When I put the key in the slot I get what I described above...nothing. But if I don't put the key in the slot, and just push the power button the display comes on but I am not able to shift into any thing other than park or neutral. When I am able to power up with out the key in the slot I get a red car with an explanation point going through it at the top left of the screen.

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