[jono246]

Hey guys, just got my hands on a 2018 mazda 3 sedan.
Is it possible to open the trunk from inside with the engine running?

I only have a bonnet latch and a fuel cap latch under the steering wheel, and if i try to long press the button on the key nothing happens.

 

[myDefiance]

Nope, not afaik. You can only unlock it from the inside using the central lock button. You'll have to instruct whoever you're dropping off how to open the boot lid.

 

[lvaleiron]

In some regions the car has an in cabin trunk opener switch (just above the bonnet and gas latches). I did purchase the button and installed myself, but it seems is not as simple as plug and play, there is a cable that needs to be routed from the button to the RBCM. There is a thread already about it, check it out:
http://mazda3revolution.com/forums/...or/203354-adding-trunk-lid-opener-switch.html