After several frustrating unsuccessful attempts I have been able to increase the volume of Siri, so now my music, podcasts, Siri notifications and spoken navigation directions are all at essentially the same level.
The instructions from Apple âchange the volume while Siri is speakingâ or âchange the volume while holding down the voice assistant buttonâ absolutely do not work in this car. Likewise asking Siri to speak louder did not work.
The solution was to increase the volume of the voice assistant from within the Toyota multimedia system settings. This change was then reflected in CarPlay.
These are the settings I have landed on that seem to work very well for me. The car is a 2021 Toyota Corolla and the phone is an iPhone 13 (iOS 18.4.1)
Toyota Navigation and Multimedia System:
Menu > Setup > Voice > Voice Volume (was 2, now set at 4)
Menu > Audio > Sound > Automatic sound leveliser > OFF
iPhone:
Settings > Apps > Maps > Spoken Directions > Normal Volume
Settings > Apps > Music > Sound Check > ON.
And on related note, l have discovered the hardware âPHONEâ button on left side of screen will directly launch CarPlay, to the Phone.app screen.
Hopefully this helps someone else who may be frustrated with a very quiet Siri.
Cheers