Opel Zafira Tourer Owner's Manual page 51

Note
The socket must always be kept
clean and dry.
Usage
Press the CD/AUX button once or
several times to activate the AUX
mode.
Navi 600 / Navi 900:
CD 300 / CD 400:
An audio source that is connected to
the AUX input can be operated only
via the control elements of the audio
source.
AUX input 51