B2775 B2795 after sitting for extended period, dead car

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Have you tried searching for the two DTCs (codes) mentioned above? (the advanced search feature is currently working)

If you need the step by step workups for those codes, just let us know.

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B2795 indicates an unmatched key code, so is it possible the seller has given you the wrong key fob?

 

Does the mechanical key work in the driver's door lock? Does the remote buttons lock and unlock the car? Is the Toyota logo on the fob black or silver? Does the car have SKS (little square button on exterior door and tailgate handles) or not?

Could be the wrong fob or might be someone replaced the fob case and didn't swap in the rfid chip from the old case.

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I have the same problem. My key works in the slot, though, and will start the car. However, it will not unlock the car. It is a black key. It also will not lock the doors. The little red light lights up on the FOB when the buttons are pressed. It has a new 3 volt battery in tnn fob.

 

What do you mean exactly when you say, 'I have the same problem'? Are you talking about your 2002 Gen 1 or a different Gen 2?

This area is different between Gen 1 and Gen 2, so you might be better off searching the Gen 1 forum for an answer.

 

My fob when inserted in the dash will start the car. The buttons, lock unlock and panic, don't do anything. I have the same immobilizer codes b2775 and b2795. My car had been sitting for a long time also.

 

have you checked the 12v?

 

DTC B2795 indicates an unmatched key code

Are you sure you are using the correct fob?

DTC B2775 indicates interior verification abnormal (to the theft deterrent ECU)

DESCRIPTION

This DTC is output when:

1. there is no response from the certification ECU,
2. the ECU communication ID was unable to be registered properly,
3. a communication error occurs between the transponder key ECU and certification ECU.

CHECK:

12 V battery is in good condition and fully charged.
You have the correct fob for the car.
Check the SKS disable switch (below the steering wheel) is in the 'out' position which is the SKS enabled position.

If these check out, then you have some issue with the theft deterrent system.

PS,

you still haven't confirmed you are talking about a Gen 2 and not the 2002 Gen 1 in your profile.

 

My family has 8 Gen 1s, 4 Gen 2s and 1 Gen3.

dolj. This is a 2005 Gen 2. That is why I replied to this post. I have a 2007 donor parts car. I'm thinking about taking the immobilizer out of it, a 2007 I bought for parts. I have the original working key for the donor car. This is a black back key. It will not work for SKS. Where is the ECU you are talking about? I have seen the immobilizer under the dash. I already have the dash apart in the donor 2007 Prius.

Bisco. 12.1 volts and 13.8 in "ready". I swapped the 12 volt battery out of another running 2007 car that the key fob works in but the 2005 buttons on the fob still don't work. Yet, the key when inserted in the slot will still start the car.

I'm not even addressing the SKS problem yet. I'd like to get the lock unlock and panic buttons on the fob to work. Also, I programmed another key from the 2007 donor Prius to the 2005 Prius. It will start the car but the buttons on that fob don't work. It has got to be something wrong in the 2005, because the newly programed key fob will still unlock and lock the 2007 donor Prius.

 

Thank you for clarifying, we can't assume because you're replying to a Get 2 thread that it logically follows you are talking about a Gen 2. People reply in the wrong forums all the time.

I'm confused (the quotes below only add to the confusion), are you conflating SKS with remote lock/unlock? SKS is the keyless 'have the fob in your pocket', can unlock the car by touching the door handle, and start the car by just pressing the power button. Remote lock/unlock is when you have to push the buttons on the fob itself to lock/unlock the car.

In any case, the DTCs you have indicate the fob you are using is not the correct one for the car.

If this fob does not remotely lock or unlock, it cannot be used in the chicken dance or Techstream to add another key.

So does the 2005 have SKS or not? Does the 2007 have SKS or not? Some clarity here would help in understanding what is going on. From what you have said so far I'm understanding the 2005 does not have SKS and the 2007 does have SKS. All versions of Prius have remote lock/unlock regardless of whether it also has SKS.

This is to be expected. You cannot program a used key to do anything but start with the key in the slot without reseeding and re-adding.

This does not follow at all. If you purchased a new key and it could not be programmed then maybe, but it seems the fob is not fully functional so it will never work.

 

2005 has SKS button. The black back key will never work with that. Agreed? The key I'm trying to get the buttons to work on is a black back key.

I understand how the SKS system works. I have SKS working on two other Prius. That is not what I'm working on here.

The 2005 key fob starts car when inserted. It is a black back key. It will never work with SKS. It's buttons the buttons on the fob don't work to unlock or lock the car. I did the "chicken dance" with the door and got the 2007 donor car fob to start the 2005. I never said the key was new. After starting the car with the 2007 fob I thought the buttons that unlock and lock the car would work. They do not.

I know what I'm going to try, I'm going to see if I can program the 2005 to start and unlock/lock the 2007 donor car. Then I will know something is wrong with the 2005 immobilizer system. And the 2005 fob will already be programmed for the other immobilizer.

Where is the key information stored. In the ECU? immobilizer? Bisco said they communicate. I have seen the immobilizer under the dash? It is labeled "immobilizer". Is the ECU the white component under it, above the gas pedal? Drivers side, kind of under the speed display when the dash is taken apart.

It's there a chicken dance to make the buttons work on a black back key? I took it to a place to program it (they have done other cars including Prius'). They did not charge me for their time, because they said they couldn't talk to the key memory computer. What does that mean?

 

Dolj. What it's "conflating" you mean confusing?

 

Conflating means combining two functions or ideas. There are clearer ways to communicate to a general audience.

 

When I bought the 2005 Prius, it had been sitting a long time. The previous owner was not driving it because the brake actuator would not communicate with the brake skid control ECU. I bought a new skid control ECU and installed it. It did not fix the brake problem. It obviously had to be programmed to the Actuator. I then bought the 2007 parts car. I removed the Actuator and skid control ECU from the "2007 donor" and installed them in the 2005 and together they work. The brakes work great now on the 2005.

 

PTS: That's the breaks though. Tough break.

Conflating would be a conflicting confusion. That's the worst.

 

I was "reticent" to bring it up but am encouraged when it "elicits" a positive response.

 

This can never work. The remote lock/unlock on a SKS model is different to the non-SKS model.

This is all you can do with the black back fob in a SKS, which is what you said the 2005 is. You cannot program a black backed fob to do either the remote lock/unlock or the SKS. You need a silver backed fob.

Similarly you cannot program a silver backed fob to do remote lock/unlock on a non-SKS car.

You can program any fob to start by inserting the fob in the slot.

 

Dolj: So, what you are saying is the black back key I was given when I bought the 2005 SKS capable Prius is not the right key for the 2005 Prius?

I have silver back (sounds like a gorilla) keys. How do I get it to work with my Prius?

 

PTS: Quit spending so much time looking at your thesaurus.