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# A lowcost DIY CAN bus emulator for Renault Scenic 2 dashboard repair
# A low-cost DIY CAN bus emulator for Renault Scenic 2 dashboard repair
*My personal contribution to the right to repair initiative.*

## Features
- 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
- Build to test your Renault Scenic 2 dashboard during and after repair
- Powers up your dashboard without the need for installation in the car
- Large test sequence that shows saved km/mileage on startup (see video)
- If connected to a serial console, timestamp and message logging on screen
- Supports standalone operation with a charging adapter

\
[![](./pics/RenaultScenic2CAN-BusEmulatorDIYonGitHub-low.gif)](https://vimeo.com/568058419 "CAN bus - Emulator in action - Click to watch on Vimeo!")
Expand All @@ -15,12 +15,12 @@


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

## Hardware
![](./pics/wireing.jpg)
![](./pics/wiring.jpg)

### Wiring
#### Arduino <-> MCP2515
Expand All @@ -35,8 +35,7 @@
|5V |VCC|
|GND|GND|

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.
On the MCP2515 board, ensure the jumper labeled J1 is closed to enable CAN bus termination.

#### The dashboard
|PIN# (grey connector on dash)| meaning|
Expand All @@ -47,17 +46,16 @@ To work properly, make sure it is closed so the CAN bus termination is enabled.
|30|CAN HI|

##### Hint
The dash takes about 4-5 amps peak current (filament heating, caps) when it starts up.
Ensure your power supply and cabling can handle 4-5 amps peak current (filament heating, capacitors) at startup.
Especially when using small current limiting lab power supplies this may become a thing.
Make sure your power supply and cabling is sufficient.
Should your power supply not provide enough current, the program might run, but the dashboard will remain dark.

## Software
The arduino project can be compiled and uploaded via the Arduino IDE. Either clone this project or download it as a [ZIP-File](https://github.com/dirksan28/Scenic2DashCanEmu/archive/refs/heads/main.zip).
The code which runs on the arduino is based on [MCP_CAN_lib](https://github.com/coryjfowler/MCP_CAN_lib).
For convenience a copy of this library also is part of this project. Just put the entire can-library folder (MCP_CAN_lib-master) into the library folder of your Arduino IDE (on linux: ~/Arduino/libraries), (on MAC-OS: /Users/YOUR-USER-NAME/Arduino/libraries/) .
The Arduino project can be compiled and uploaded via the Arduino IDE. Either clone this project or download it as a [ZIP-File](https://github.com/dirksan28/Scenic2DashCanEmu/archive/refs/heads/main.zip).
The code running on the Arduino is based on [MCP_CAN_lib](https://github.com/coryjfowler/MCP_CAN_lib).
For convenience, a copy of this library is part of this project. Just place the entire can-library folder (MCP_CAN_lib-master) into the library folder of your Arduino IDE (on linux: ~/Arduino/libraries), (on MAC-OS: /Users/YOUR-USER-NAME/Arduino/libraries/) .

The Message-Sequence can be extended or modified by patching the following code fragments within the [canEmu.ino](./Arduino/canEmulator/canEmulator.ino "link to canEmu.ino") file:
The message sequence can be extended or modified by editing the following code fragments within the [canEmu.ino](./Arduino/canEmulator/canEmulator.ino "link to canEmu.ino") file:

### Code
```c
Expand All @@ -69,7 +67,7 @@ The Message-Sequence can be extended or modified by patching the following code
**/
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
,{4, 0x60d, 8, { 0x00, 0x10, 0x00, 0x00, 0x27, 0x73, 0x21, 0x71}} //reset displayl state
...
};

Expand All @@ -81,58 +79,54 @@ const struct msgStruct initMessages[] PROGMEM = {
**/
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}}
,{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.
To see what the code is doing, start the serial console of the Arduino IDE at 9600 baud.
#### Hint
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](https://wokwi.com/arduino/new?template=arduino-uno) wich makes it easier for debugging purposes.
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 famous and free [WOKI Online Arduino Simulator](https://wokwi.com/arduino/new?template=arduino-uno), making it easier for debugging purposes.
## Current state
The code was tested on a V5.14 dashbord and runs fine.
The code was tested on a V5.14 dashboard and runs fine.
## Design principles
- 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 ++
- Keep it simple.
- Ensure even non-Arduino experts can easily use and set up the project.
- Minimize dependencies (e.g., libraries, source files, additional hardware, etc.).
- Make it adaptable and expandable even without knowledge of C / C++.
## Collection of ideas
- 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
- Read the CAN messages from an external SD card (supporting different dashboards without compiling the code).
- Single-step mode (possibly forwards and backwards) via an additional button.
- PCB layout for a self-contained, single-board solution.
## Known issues
- CAN message to activate the lightbulb symbol is currently unknown
- The CAN message to activate the lightbulb symbol is currently unknown.
<br><img title="click to enlarge" src="./pics/missingBulbInd.png" width=40% height=40%>
## Further infos & links
### Resources
- 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
- If you are looking for further information, **tips & tricks on how to repair your Renault Scenic II dashboard**, check a look at https://www.digital-kaos.co.uk/forums/showthread.php/59335-repair-dashboard-scenic-2
- Radovan Petković Raša shows the **systematic troubleshooting and successful repair** of a Scenic II dashboard with lots of tips and great advice. **The best video** on this topic online. If you don't speak Serbian, turn on automatic subtitle translation. https://www.youtube.com/watch?v=_f3Z28OoKZQ - Thank you, Radovan for the time and effort you put into this. Great work!
- A good repair video that also shows **how to desolder the large display properly** (unfortunately in French, but the subtitle function should help): https://www.youtube.com/watch?v=UUcnZQbhVvc
### How to powerup without any CAN-bus emulator
### How to power up even without a CAN-bus emulator
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.
<br> Therefore connect the **gray connector** to your power supply as usual:
<br> Connect the **gray connector** to your power supply as usual:
- Pin1 +12V
- Pin2 GND
And on the **[red connector](./pics/Scenic2SteeringWheelRadioRemote.pdf)**
- Pin1 via a 1kΩ resistor to +12V
<img title="click to enlarge" src="./pics/Scenic2CheckClockDisp.png" width=20% height=20%>
This simulates the same situation as turning on your radio in the car and therefore results in the clock display turning on.
<img title="click to enlarge" src="./pics/Scenic2CheckClockdisplay.png" width=20% height=20%>
This simulates turning on your radio in the car, resulting in the clock display turning on.
### Forks and Variants
- 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.
- Thanks to David Douard, there is now a fork based on **ESP32 + SN65HVD230 as CAN transceiver** available. Check https://github.com/douardda/Scenic2DashCanEmu for details.

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