HDMI-CEC has many different set of functionalities: Auto power on/off, Auto input switch, PLQS and ARC. On Pioneer, you need to make sure HDMI control is ON and Control Mode is ON in order to do what you want. There is also settings for turning on/off ARC and PLQS.
TVs can similar settings. For example, my Panasonic allows me to control auto power on/off and input switch separately.