How do you power down a Cybertruck like the Model 3

[gtgarner]

How does one fully power down the Cybertruck? (Please avoid speaking about the power down button on the screen).

Simple.

On the Model 3

1. Remove 12v battery cable.
2. Disconnect the Connector under the passenger's rear seat (opens contactor in the penthouse)

Done

On the Cybertruck

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[CyberGus]

You must access the MV battery under the frunk apron to disconnect it.

https://service.tesla.com/docs/Cybe...UID-A399E8AE-5DCF-4095-91FA-AF0148503F3B.html

 

[gtgarner]

You must access the MV battery under the frunk apron to disconnect it.

https://service.tesla.com/docs/Cybe...UID-A399E8AE-5DCF-4095-91FA-AF0148503F3B.html

Understood.

Does the MV power procedure disconnect the High Voltage Pack?

In the Model 3 - disconnecting the 12V low voltage power ( MV power) does NOT disconnect the Main Battery Pack. You have to also disconnect the wire from the penthouse to open the contactor from the main battery pack.

In the Cybertruck - does disconnecting the 48V low voltage power (MV power disconnect) also disconnect the Main Battery Pack?

 

[CyberGus]

With the MV power disconnected, the HV contactors will remain open.

 

[gtgarner]

With the MV power disconnected, the HV contactors will remain open.

Ok, so the Cybertruck only has a single step process instead of a 2 step process like the other models.

What do you mean by - remain open?

Do you mean that they will open?

 

[CyberGus]

Ok, so the Cybertruck only has a single step process instead of a 2 step process like the other models.

What do you mean by - remain open?

Do you mean that they will open?

When contactors are open, the circuit is open; the HV cells are physically disconnected from the external connectors.

This assumes that the vehicle was powered OFF first. If the vehicle is on when the MV battery is disconnected, it will remain on by supplying 48V via the DC-DC converter.

 

[CyberGus]

Is this an academic exercise, or are you planning on removing the HV pack? There are significantly more steps to do so.

 

[gtgarner]

Is this an academic exercise, or are you planning on removing the HV pack? There are significantly more steps to do so.

No, I'm not removing the pack. I'm swapping out the steering wheel if I can.

I've seen (word of mouth) that there are 2 connectors to disconnect

1. Blue one - to keep the auto steering reset from occurring.
2. Red one - MV disconnect to keep the Center hub from moving.

However, there are some people that have bricked their vehicles - behind the scenes - because either they took too long to re-establish the MV connect (which caused the 48v battery to deplete to a need for charge status - after a few hours).

If the vehicle is powered off and MV disconnect has occurred - how is any CPU still running if the main pack contactor is open?

Something is totally different than the other 4 models.

 

[gtgarner]

When contactors are open, the circuit is open; the HV cells are physically disconnected from the external connectors.

This assumes that the vehicle was powered OFF first. If the vehicle is on when the MV battery is disconnected, it will remain on by supplying 48V via the DC-DC converter.

Interesting - because that's not true with the other models.

In the other models - if you disconnect the 12v battery and remove that connector from beneath the rear seat on the passenger's side - That battery pack connector instantly opens. I've done it many many times on my Model 3

I'm trying to learn the CT because its different.

 

[CyberGus]

I've seen (word of mouth) that there are 2 connectors to disconnect

Yes, the Service Manual link I provided above states that the Firemans’ Cut Loop must also be disconnected, but I don’t know exactly why.

there are some people that have bricked their vehicles - behind the scenes - because either they took too long to re-establish the MV connect (which caused the 48v battery to deplete to a need for charge status - after a few hours)

I’ve never heard of this. The MV battery can of course die, but I don’t understand how it could discharge in a few hours when physically disconnected.

If the vehicle is powered off and MV disconnect has occurred - how is any CPU still running if the main pack contactor is open?

It cannot. If the contactors are closed, the MV battery is not needed to keep the HV pack active. Once opened, the contactors cannot be closed without a power source.

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