Replacing a Bricked damaged or faulty ECU with new or used ECU FRS BRZ GT 86

[Chris14a]

Hi

Sorry to bring up a old thread but i have a issue with my smt ecu not communicating correctly as when I go to start my car I get the orange key symbol and i have to press the start button once amd the car will beep and the orange key light comes on and the smart key led flashes, I then hold my smart key on the start button this then turns the ignition on and the key symbol goes green ,The car will then start. When the car is running the orange key symbol flashes.

It is flagging error code b2799 which is related to the key ecu and engine ecu not communicating. I have used tech stream and the car will do a "handshake" with the key using the start but and recognises it but will not pick the key up any other way. I have tried this procedure with another ecu that the car would notrun with and now ot will run but it still requires the emergency start procedure.

Does anybody have any ideas or should i have started a new thread.

Thanks Chris

[steve99]

Originally Posted by Chris14a

Hi

Sorry to bring up a old thread but i have a issue with my smt ecu not communicating correctly as when I go to start my car I get the orange key symbol and i have to press the start button once amd the car will beep and the orange key light comes on and the smart key led flashes, I then hold my smart key on the start button this then turns the ignition on and the key symbol goes green ,The car will then start. When the car is running the orange key symbol flashes.

It is flagging error code b2799 which is related to the key ecu and engine ecu not communicating. I have used tech stream and the car will do a "handshake" with the key using the start but and recognises it but will not pick the key up any other way. I have tried this procedure with another ecu that the car would notrun with and now ot will run but it still requires the emergency start procedure.

Does anybody have any ideas or should i have started a new thread.

Thanks Chris

Replace the battery in key fob will sort it
If you have a read of owners manual it explains the key symbols and beeps

[Chris14a]

Originally Posted by steve99

Replace the battery in key fob will sort it
If you have a read of owners manual it explains the key symbols and beeps

Unfortunately i do not have a owners manual as the car didnt come with one from japan. I have replace the key batterys and nothing changed. My car was changed to keyless entry in japan as originally it came with a standard key but the car arrived to me like it is. I think one of the ecu's is miss matched but dont know how to re sync them.

Thanks Chris

[churchx]

Chris14a: find owners manual in pdf form online from one of toyota's sites. My car also didn't come with one, but found/downloaded for reference pdfs both in english and translated in local/native language, IIRC from here.

[Trapgodfrs]

Hey guys I’m a absolute noob at this, when you “loop pins 4 and 13” are you switching the pins on the obd port or looping them together?

[steve99]

Originally Posted by Trapgodfrs

Hey guys I’m a absolute noob at this, when you “loop pins 4 and 13” are you switching the pins on the obd port or looping them together?

No dont need to remove pins or wires mate. Just use a peper clip or other small piece of wire to connect 4 and 13 togeather, just poke one end in 4 and other in 13 of obd port

[steve99]

Originally Posted by Trapgodfrs

Hey guys I’m a absolute noob at this, when you “loop pins 4 and 13” are you switching the pins on the obd port or looping them together?

No dont need to remove pins or wires mate. Just use a paper clip or other small piece of wire to connect 4 and 13 togeather, just poke one end in 4 and other in 13 of obd port


See example here from different car


No need to remove the obd port like in video , just done so you can see conbwctions easier, jist loop the 4 and 13 sockets on connector

[CokeZero]

I need help.

My 15 BRZ the cluster doesn't come on. The car will not go into accessory mode or run or start. The hazard indicators flash in the cluster when their on.

The cluster, the clock, the radio, the power windows, the heated seats all do not work.

The lights, interior lights, horn, hazards all work fine. The car just won't turn on. (The obd port does get power too)

Ive replaced all 3 ecms, checked all fuses, made sure the battery was good, tried holding key to start button, nothing is working.

I cant do the pin 4 and 13 thing because the car wont even go into on mode. Could the immobilizer have something to do with this? If i took it to the dealer to get it all coded together again would that fix all these issues?

[steve99]

Originally Posted by CokeZero

I need help.

My 15 BRZ the cluster doesn't come on. The car will not go into accessory mode or run or start. The hazard indicators flash in the cluster when their on.

The cluster, the clock, the radio, the power windows, the heated seats all do not work.

The lights, interior lights, horn, hazards all work fine. The car just won't turn on. (The obd port does get power too)

Ive replaced all 3 ecms, checked all fuses, made sure the battery was good, tried holding key to start button, nothing is working.

I cant do the pin 4 and 13 thing because the car wont even go into on mode. Could the immobilizer have something to do with this? If i took it to the dealer to get it all coded together again would that fix all these issues?

If the obd port is bot working either fhe obd port power fue is blown or you have dead ecu or a can buss problem. The engine ecu should be accessable via obd port regardless of security sync.


Why did you replace these parts, which units were replaced

[CokeZero]

Originally Posted by steve99

If the obd port is bot working either fhe obd port power fue is blown or you have dead ecu or a can buss problem. The engine ecu should be accessable via obd port regardless of security sync.


Why did you replace these parts, which units were replaced

The obd 2 port does work. when I put a dongle on there it lights up. But I thought you had to be in the "on" position to be able to program anything.

In this pic #1, #6 and #7 were replaced. Because the car had got water in it.

Would them not being programmed cause the cluster not to light up? I assumed it still would. maybe even turn over, just not start.

The Toyota dealership in my town said they can't reprogram mine that only a Subaru dealership can (which i dont have in my town)

[steve99]

Originally Posted by CokeZero

The obd 2 port does work. when I put a dongle on there it lights up. But I thought you had to be in the "on" position to be able to program anything.

In this pic #1, #6 and #7 were replaced. Because the car had got water in it.

Would them not being programmed cause the cluster not to light up? I assumed it still would. maybe even turn over, just not start.

The Toyota dealership in my town said they can't reprogram mine that only a Subaru dealership can (which i dont have in my town)

the only unit in the security set you can easily swap yourself is the engine ecu, the other will require dealer programming unfortunatly

[CokeZero]

Originally Posted by steve99

the only unit in the security set you can easily swap yourself is the engine ecu, the other will require dealer programming unfortunatly

Isn’t the dealer programming tech stream? If they do it with that, why can’t we?

[steve99]

I belive its possible to re code some modules if you have a dealer level techstream. But some modules ie imobilisier and keys require access to an external database.


Ive not done other modules just ecu


You wil! Also need the full service manual, which has the proceedures to change each module. These oroceedures must be ferformed ecaxtly and in sequence


Even without security sync of modules you should be able to access them via can buss. For example the ecu should be accessable via obd port as soon as ignition full on. If not you have other issues like power bad connections or other dead modules interferring with can buss communications

[CokeZero]

That’s what I’ve been saying all along. The obd has power but can’t put the push button start into full on mode