Note that the messaging scheme for PQ vs. MQB vs. MLB (Audi only) are entirely different. Following are the VW version definitions for the different CAN-matrix (as VW names its CAN-version).
- PQ: CAN matrix v4.5.x (4.x ?)
- MQB: CAN matrix v5.x
- MLB: CAN matrix v6.x
CAN bus
VW uses 11bit identifiers in broadcast-manner, 29bit are used for diagnostic/ISO-traffic but that is (obviously) only seen when sniffing CAN bus during a diagnostic session.
Not all bus are present in all PQ cars. Passat B6 for example only has CAN powertrain + diagnosis. Passat B7 has powertrain, infotainment, comfort, cluster, infotainment mandatory.
CAN bus requires 120Ohm termination on either side of the distributed CAN. VW does use following terminations:
| CAN | speed | termination 1 | termination 2 |
| AFS private | 100 kBit/s | AFS: 66Ohm | AFS module left & right (both 2.6kOhm) |
| powertrain / Antrieb | 500 kBit/s | ECU / Motorsteuergerät: 66Ohm | ACC (3C0-radars, LIDAR), AFS, Airbag, ESP/ABS, DCC, PDC/PLA, EPS/Lenkung, CAN-Gateway, TCU/Getriebe, LWS/Lenkwinkelsensor, GearSelector/Wählhebel, Haldex: all 2.6kOhm EPB (if not on private CAN with ABS) |
| diagnosis | 500 kBit/s | CAN-Gateway: 66Ohm | OBD-II connector |
| infotainment | 100 kBit/s | CIB/car interface box, CAN-Gateway, Radio&Navigation, phone, SHZ/Standheizung: all 560Ohm | compass, MDI/mobile device interface, rearset audio, TV-Tuner, soundsystem: all 5.6kOhm |
| cluster / Kombiinstrument | 500 kBit/s | CAN-Gateway: 66Ohm | cluster: 2.6kOhm |
| comfort | 100 kBit/s | BCM, CAN-Gateway, clima: 560Ohm driver-door, passenger-door: 1kOhm | trailer, Multifunktionssteuergerät, SMLS/steering column electronics, memory driver seat: all 5.6kOhm |
| EPB private / parking break | 500 kBit/s | EPB | ABS/ESP (not MK60EC1) |
| SWA / side assist private | 500 kBit/s | side assist master | side assist slave |
| extended | 500 kBit/s | ? CAN-Gateway ? probably 66Ohm ? | MFK/multifunctional camera, SWA/side assist, ACC (post 3C0-radars like 3AA, 7N0) |
“private” indicates a private CAN between control units. Private means that the CAN is not routed to the CAN-Gateway.
some abbreviations are more German than others:
- AFS = Advanced Frontlight System
- DCC = Dynamic Chassis Control
- TCU = Transmission Control Unit = GSG = Getriebesteuergerät
- LWS = Lenkwinkelsensor = steering angle sensor
- BCM = Body Control Module = BSG = Bordnetzsteuergerät
- SMLS = Schaltermodul Lenksäule = steering column electronics
- EPS = Electronic Power Steering
- SWA = Spurwechselassistent = lane change assist
- EPB = Electronic Parking Brake = elektronische Parkbremse
LIN bus
speed 19,2 kBit/s
| name | participants |
| BCM-LIN / BSG-LIN | RLS/rain-&lightsensor, front wiper |
| Tür-LIN / door | back doors |
| SMLS-LIN / steering wheel electronics | MFL/MFSW multifunctional steering wheel |
| DWA-LIN / alarm | alarm horn, sensors overhead (?) |
| Dach-LIN / roof |
Higher level protocols
BAP
DDP (probably not used in PQ, clusters with red color dot matrix display)
TP2.0