A4 Mk2
| Multi-function steering wheel - overview |
| 1 - | Engine control unit -J623- in plenum chamber |
| 2 - | Instrument cluster |
| 3 - | Telephone and telematics control unit -J526- / telephone transmitter and receiver unit -R36- in electronics box beneath front seat (right-side) |
| 4 - | CAN bus (infotainment) |
| 5 - | CAN bus (convenience) |
| 6 - | Radio -R- / Navigation system with CD drive control unit -J401- in centre console (top) |
| 7 - | CD changer -R41- in glove box |
| 8 - | Multi-function steering wheel |
| q | Removing and installing multi-function buttons → Chapter |
| q | Removing and installing tiptronic buttons → Chapter |
| 9 - | Onboard supply control unit -J519- behind driver's storage compartment (LHD)/behind glove box (RHD) |
| 10 - | LIN data Bus (single-wire bus) |
| 11 - | Steering column electronics control unit -J527- on steering column |
| q | Pin assignment → Chapter |
| 12 - | CAN bus (drive train) |