Jetta CAN

Control the gauges and lights of a Jetta instrument cluster via CAN bus.

Parts

Using the following hardware:

• 2014 Jetta instrument cluster (used, Ebay)
• Arduino UNO
• Seeed Studio CAN bus shield v2
• hookup wires and cables
• AC-DC 12V PSU (Velleman)

Using the following software:

• Eclipse Photon
• Sloeber
• CAN bus shield library https://github.com/Seeed-Studio/CAN_BUS_Shield

Connections

Found a pretty good reference.

• 16 GND (31)
• 28 CANH
• 29 CANL
• 31 +12V ignition (15)
• 32 +12V battery (30)

Quick connect

Until proper wiring harness:

TOP 27 11 28 12 29 13 30 14 31 15 32 16 BOTTOM

Use 8-pin F-F for pins 32-27=ROYGUB Use 3 pin F-F for pins 16-14=BRW

Cluster boot

16=GND, 32=B, 31=B

received ids

The cluster emits the following:

• 320
• 420
• 621
• 727

transmit ids

the cluster receives the following PGNs:

• 050 airbag
• 1A0 abs
• 280 tachometer
• 470 operating lights, warning lights, doors
• 480 engine malfunction, fuel cap
• 5A0 speed and drive mode

Instrument indicators

Gauges

Tachometer Speedometer Mileage Trip mileage Time of day Fuel Outside temperature

Telltales

Oil * Engine coolant temperature low/level low/malfunction * Door mirror? * Power steering malfunction/reduced/locked * Engine check MIL * Off road * ABS * Tire pressure * Airbag * Door open Trunk open High beam Fog lamp Left turn Right turn Clutch/park Key battery Glow plug preheating Brake pedal not depressed Handbrake * ESC CRUISE Alternator malfunction EPC engine control malfunction

Fuel low Fuel cap not tight/missing

Sounds

Notes and references

Wikipedia gives the translation formulas https://en.wikipedia.org/wiki/OBD-II_PIDs

Dashboard symbols https://www.vwserviceandparts.com/service/volkswagen-dashboard-indicator-lights/ (different than the 2014)

A good resource including a sample ino file. Got a lot of the data details here. https://hackaday.io/project/6288-volkswagen-can-bus-gaming

Volkswagen Communication But does seem to have the CAN IDs https://www.snapon.com/Files/Diagnostics/UserManuals/VolkswagenAudiVehicleCommunicationSoftwareManual_EAZ0031B01D.pdf

http://www.copperhilltechnologies.com/can-bus-guide-message-frame-format

Some very detailed overview of particular vehicles: https://www.slideshare.net/soxxxcool/car-hacking

Bitfields

We can use bit fields, shift masks, B-literal masks. Bit fields are not very portable. Here's some info on a C++ way to have portable bit fields: https://stackoverflow.com/questions/31726191/is-there-a-portable-alternative-to-c-bitfields

Decoding the CAN bus

General decoding

https://hackaday.io/project/6288/instructions https://christian-rossow.de/publications/vatican-ches2016.pdf https://sites.google.com/view/dashboard-control/can-bus-hardware

Hacking 0x280:

http://ev-a2.blogspot.com/2013/06/can-bus-analysis-started.html

0x470

Turning lights 2?

Links and references

Seed Studios CAN Bus Shiels v2