Signal specification
General
All the values given below are between the terminals stated in column 1 and terminal #1 in column 2 (signal ground). This applies unless otherwise indicated in brackets.
NOTE:
It is important to connect the breakout box and check the ground terminals before taking readings.
| U= | DC voltage in volts (V) | UAC = | AC voltage in volts (V) |
| Ubat = | Battery voltage (V) | f = | Frequency in Hertz (Hz) |
| Ulow = | Voltage approximately 0 V | t = | Time in seconds |
| PWM = | Pulse width modulated signal as a % |
Connector handsfree box
| Control module terminal | Signal type | Ignition on | Idle | Other |
|---|---|---|---|---|
| #1 | Ground | U low | - | - |
| #2 | 30 supply In the XC90 and S40 (04-) the handsfree box is powered via the infotainment relay. |
U bat | - | - |
| #3 | - | - | - | - |
| #4 | Loudspeaker signal (+) | Alternating current when there is sound in the loudspeaker | - | - |
| #5 | 15 supply | U=12 V | - | - |
| #6 | Radio mute signal | During a call U=Ulow U=12 V otherwise |
- | - |
| #7 | Loudspeaker signal (-) | Alternating current when there is sound in the loudspeaker | - | - |
| #8 | - | - | - | - |
Antenna connector
| Control module terminal | Signal type | Ignition on | Idle | Other |
|---|---|---|---|---|
| #1 | Handsfree antenna | Handsfree antenna signal | - | - |
| #2 | Antenna ground | U low | - | - |
Microphone connector
| Control module terminal | Signal type | Ignition on | Idle | Other |
|---|---|---|---|---|
| #1 | Microphone | Alternating current when there is sound in the microphone | - | - |
| #2 | Signal ground, microphone | U low | - | - |