Honda CRF1100A 2021 Owner's Manual page 342

Audio System Trouble
Symptom
III IN, II MA, III MA, KO, III KO
type
Apple CarPlay is not be
available.
336
When the paired headset connection is broken due to headset
battery depletion or communication failure, Apple CarPlay cannot be
used until the connection is restored.
The screen will not switch to Apple CarPlay automatically, other than
when the ignition switch is turned to
activated.
Some USB cables may be incompatible with Apple CarPlay. Use
certified cable to connect the iPhone.
You have not agreed to enable Apple CarPlay. Reconnect the
iPhone and enable CarPlay on the disclaimer screen.
Apple CarPlay setting on your iPhone may be disabled. Disconnect
iPhone and enable the Apple CarPlay setting on your iPhone.
Cause/remedy
(Off) with Apple CarPlay
P. 201
2