The XDA II pinout is outlined below
The connector pinout
1 CAR_MIC_IN
2 GND / SENSE
3 CAR_AUDIO_R
4 CAR_AUDIO_L
5 ANALOG GND
6 RS232_DCD
7 RS232_CTS
8 RS232_TXD
9 RS232_RTS
10 RS232_RXD
11 RS232_DTR
12 NC
13 USB_VDD
14 UDC+
15 UDC-
16 GND
17 GND
18 GND
19 CAR_ON#
20 V_ADP
21 V_ADP
22 V_ADP