My personal contribution to the right to repair initiative.

• build to test your Renault Scenic 2 dashboard after and during repair
• powers up your dashboard without the need of installation in the car
• large test sequence. Shows saved km/milage on startup. (see video)
• if connected to a serial console: timestamp and message logging on screen
• standalone operation (only with charging adapter) possible

click to watch the full vid on Vimeo

• an Arduino (Uno) a cheap clone also works ;-)
• a MCP2515 module (e.g. https://www.amazon.com/s?k=MCP2515)
• The Arduino IDE https://www.arduino.cc/en/software to compile and upload the sketch to the arduino.

On the MCP2515 board there is a jumper which is labeled J1. To work properly, make sure it is closed so the CAN bus termination is enabled.

The dash takes about 4-5 amps peak current (filament heating, caps) when it starts up. Especially when using small current limiting lab power supplies this may become a thing. Make sure your power supply and cabling is sufficient.

The arduino project can be compiled and uploaded via the Arduino IDE. Either clone this project or download it as a ZIP-File. The code which runs on the arduino is based on MCP_CAN_lib. For convenience a copy of this library also is part of this project. Just put the can-library into the library folder of your Arduino IDE (on linux: ~/Arduino/libraries).

The Message-Sequence can be extended or modified by patching the following code fragments within the canEmu.ino file:

/**
 * the following stuct contains the messages which are send to the dash
 * for initialization
 * feel free to add or remove messages.
 * {duration, id, dlc {byte1, byte2, ... byte_dlc}}
**/
const struct msgStruct initMessages[] PROGMEM = {
   {10, 0x35d, 8, { 0x10, 0x03, 0x20, 0x00, 0x00, 0x00, 0x50, 0x00}}   //dash on
  ,{4, 0x60d, 8, { 0x00, 0x10, 0x00, 0x00, 0x27, 0x73, 0x21, 0x71}}    //reset displ state
...
};

/**
 * the following stuct contains the messages which are send to the dash
 * within a loop
 * feel free to add or remove messages.
 * {duration, id, dlc {byte1, byte2, ... byte_dlc}}
**/
const struct msgStruct messages[] PROGMEM = { //load into flash-memory (sram was to small)
  {1, 0x743, 8, {0x02, 0x10, 0xC0, 0x00, 0x00, 0x00, 0x00, 0x00}}  //enable indicators
  ,{3, 0x743, 8, {0x04, 0x30, 0x06, 0x20, 0xFF, 0x00, 0x00, 0x00}} //left ind. lights
  ,{3, 0x743, 8, {0x04, 0x30, 0x07, 0x20, 0xFF, 0x00, 0x00, 0x00}}
  ,{1, 0x743, 8, {0x04, 0x30, 0x01, 0x20, 0x01, 0x00, 0x00, 0x00}}
  ,{1, 0x743, 8, {0x04, 0x30, 0x01, 0x20, 0x07, 0x00, 0x00, 0x00}}
  ,{1, 0x743, 8, {0x04, 0x30, 0x01, 0x20, 0x06, 0x00, 0x00, 0x00}}
  ...
  };

To see what the code is doing. Start the serial console of the Arduino IDE at 9600 Boud.

If you remove line #4

#define ENABLE_CANBUS

output to the MCP2515 breakout board will be skipped. By doing so the code runs fine within the free WOKI Online Arduino Simulator wich makes it easier for debugging purposes.

The code was tested on a V5.14 dashbord and runs fine.

• keep it stupid simple
• even "non-arduino experts" should be able to use and set up the project easily
• keep dependencies as few as possible (e.g. libraries, source files, additional hardware, ...)
• adaptable and expandable even without knowledge of C / C ++

• Read the CAN messages from an external SD card (thus support for different dashboards without having to compile the code)
• single step mode (possibly forwards and backwards) via an additional button
• PCB layout for a self containing, single board solution

• CAN message to activate the lightbulb symbol is currently unknown
  

• If you search for further information, tips & tricks on how to rapair your Renault Scenic II dashboard - take a look at https://www.digital-kaos.co.uk/forums/showthread.php/59335-repair-dashboard-scenic-2
• Radovan Petković Raša shows here the systematic troubleshooting and successful repair of a Scenic II dashboard with lots of tips and great advice. The best video on this topic that can be found online. If you don't speak Serbian, just turn on automatic subtitle translation. https://www.youtube.com/watch?v=_f3Z28OoKZQ - Thank you for the time and effort you put into this. Great work!
• A good repair video, which also shows how to desolder the large display properly (unfortunately in french - but the subtitle function should do the trick) https://www.youtube.com/watch?v=UUcnZQbhVvc

For an initial test on your desk, you can partially switch on the dashboard (only the small clock display) even without a CAN-bus emulator.
Therefor connect the gray connector to your power supply as usual:

• Pin1 +12V
• Pin2 GND

And on the red connector

• Pin1 via a 1kΩ resistor to +12V

• Thanks to the great work of David Douard there is now also a fork based on ESP32 + SN65HVD230 as CAN transceiver available. Check https://github.com/douardda/Scenic2DashCanEmu for details.