ID7 random resets.

[sjb993]

I'm trying to help out my son who has a 2019 G20 330e.

Various things on his car are randomly reset, and it happens fairly frequently. Things such as rear window lock button, BC stalk button setting, ambient light colour, phone disconnects and several more. IDrive resets don't make any difference.

Does anyone know what can cause this random behaviour, and things he can try to fix it?

TIA.

[rassi]

Duff battery? Using different key (= different profile) signing in?

[sjb993]

Thanks for your response.

Which battery? He has replaced the key battery and uses the same key all the time.

[miniman]

sjb993 said:

Thanks for your response.

Which battery? He has replaced the key battery and uses the same key all the time.

Main car battery. Failing batteries often cause odd electrical gremlins.

[sjb993]

Can the 12v battery be faulty enough to cause problems without the battery warning light showing in the instrument panel?

[miniman]

sjb993 said:

Can the 12v battery be faulty enough to cause problems without the battery warning light showing in the instrument panel?

In my experience of BMW, Jaguar and Land Rover, very much so.

[danb79]

sjb993 said:

Can the 12v battery be faulty enough to cause problems without the battery warning light showing in the instrument panel?

Absolutely!

Time to get a multimeter on it; needs to be c12.4v with engine off/car asleep and c14.4v with the engine running

[sjb993]

Thanks all. I'll tell him to check the 12v battery.

Just out of interest, as his car is a plug-in hybrid, does the 48V battery just power the electric motor? That is, the 48v battery doesn't have any part to play in the 12v components in the car.

[Caddyshack]

sjb993 said:

Thanks all. I'll tell him to check the 12v battery.

Just out of interest, as his car is a plug-in hybrid, does the 48V battery just power the electric motor? That is, the 48v battery doesn't have any part to play in the 12v components in the car.

If it’s 48v then surely that replaces the 12v and then you have a controller to drop the voltage for 12v stuff? If he electric motor battery would be over 300 volts wouldn’t it?

[sjb993]

Sorry for any confusion.

I have an M340i MHT which has a 12v and a 48v battery. I assumed that my son's 330e would also have 12v and 48v batteries.

Update: I have just checked and the 330e does have a 12v battery, along with a 293v one for the electric motor.

Edited by sjb993 on Tuesday 8th October 17:32