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Workshop manual -> Search for antennas.

No antenna. No signal. No datalink.

If the iPhone can use its body as an antenna then your car can use its wiring or body parts etc?

Hopefully you can find a single antenna connection and suitably terminate it (instead of just having it unpopulated).

But yeah, no guarantees that this is possible, or terminating all external antenna connectors is sufficient.

And no eCall.

I can put my car in offline mode (blue link).