CITROËN C3 Handbok page 62

Comfort
Connector lines
A1 (+) Right hand rear speaker
A2 (+) Right hand front speaker and tweeter
A3 (+) Left hand front speaker and tweeter
A4 (+) Left hand rear speaker
A5 (-) Right hand rear speaker
A6 (-) Right hand front speaker and tweeter
A7 (-) Left hand front speaker and tweeter
(-) Left hand rear speaker
a8
a9 not used
A10
not used
A11
not used
A12 (+) Permanent
A13
not used
A14
not used
A15 (+) Ignition switched (operation of the audio system only with the ignition on)
A16
Earth
60
Never use a separate wire to connect
the (+) of your audio equipment (risk of
discharging of the battery).