RTI control module (to audio unit)
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Volvo S80, 2005 Volvo S80, 2004 Volvo S80, 2003 Volvo S80, and 2002 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.
Before taking any readings, read Connecting the breakout box and checking the ground terminal .
The RTI control module terminals E1-E8 correspond to terminal #16-#23 on the breakout box.
| Control module terminal | Breakout box terminal | Signal type | Ignition on | Signal specification |
|---|---|---|---|---|
| E1 | #16 | Clock signal to audio unit | Digital signal | Melbus protocol |
| E2 | #17 | Signal ground, sound | Ulow | - |
| E3 | #18 | 15 supply | Ubat | - |
| E4 | #19 | Data signal to audio unit | Digital signal | Melbus protocol |
| E5 | #20 | Busy signal to audio unit | Digital signal | Melbus protocol |
| E6 | #21 | Left audio channel | Alternating current on sound to loudspeakers | 150 mV rms +/- 38 mV (1 kHz 30% mod) |
| E7 | #22 | Right audio channel | Alternating current on sound to loudspeakers | 150 mV rms +/- 38 mV (1 kHz 30% mod) |
| E8 | #23 | Voice guide channel | Alternating current on sound to loudspeakers (for voice guidance) | 150 mV rms +/- 38 mV (1 kHz 30% mod) |
| H | Screen ground, cable to audio unit | Ulow | - |