Provisions for handsfree (TEL 1): Function
- Voltage (+30) is supplied from fuse 39 to pin 11 for powering the mobile phone and charging its battery.
- Voltage (+15) is supplied from fuse 19 to pin 10 for switching on the mobile phone.
- Ground connection at grounding point G41P via pin 1.
- Mute control for disconnecting normal sound via pin 4 of the 18-pin connector to pin 6 of the main unit.
- Incoming phone sound (line output) via pins 7/16 to pins 22/23 on the main unit for relaying through the audio system loudspeakers.
- Outgoing phone sound from microphone, signal via pin 18 and ground via pin 9.