GS450h cuts out

[Gokan]

I was hoping someone can help me. I've got a 2009 GS450h which has an odd issue. The car goes completed dead on occasion when I try push to switch off the engine. The steering wheel does not fully retract and I cannot use the remote to lock the doors. It then doesn't restart and I have to disconnect the Battery to start the engine as everything is completely dead. 

On occasion the vehicle has also failed to unlock and start up and does not respond to the key. I have replaced the fob Battery and it has not changed anything. The Battery appears to have appropriate voltage.

Any idea what is causing this issue? I do not have any warning lights.

 

[steve2006]

Hi Gokan and welcome to the LOC.

There is a very good chance it could still be due to your 12 volt aux Battery, how old is it?
You may have a good terminal voltage present but without sufficient current (amps) being provided it won’t be able to supply enough power for the systems.

Have it checked professionally, most places do a free test.

BTW have you checked the Battery terminals are tight?

[ColinBarber]

Possibly an issue with the power management ECU or the relays it controls.

When the issue occurs, what items still work - interior light, can you turn on the side lights, brake lights if you press the brake pedal, horn etc. etc. When you say the steering wheel doesn't fully retract, is it only partial retracting or not at all?