To use Android Auto with your Android Smartphone, at least Android 5.0 (Lollipop) or a higher version of the Android operation system must be installed on your smartphone.
To use Android Auto on your ZENEC device, you have to adjust time and date on your ZENEC device correctly. Please pay attention to chapter „Setup Operations → System → Clock & Date Setup“ in the main device manual of the Z-E3756.
For more detailed information about Android Auto, please visit https://www.android.com/auto/ and https://support.google.com/androidauto#topic=6348027