Pioneer F90BT - AVIC - Navigation System Operation Manual page 122

Chapter
24 Using the external unit (EXT1, EXT2)
The external unit can be operated by trans-
mitting the operating commands set to 1
key — 6 key.
p Operation varies depending on the exter-
nal unit connected. (In some cases,
some functions may not be used until
you touch and hold the key.)
7 Operate the external unit by using F1 —
F4
The external unit can be operated by trans-
mitting the operating commands set to F1
— F4.
p The operating commands set to F1 —
F4 vary depending on the external unit.
p Some functions may not be used until
you touch and hold the key.
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