Just bough a NAC wave2 unit / Unable to turn it on. Defective ?

[gibman]

I am in the process of upgrading my old SMEG system (radio unit+touch screen) with a newer NAC system.
My car is a "Citroen C4 Grand Picasso 2015"

So I bought ..

• arduino + canbus shield 1.2 (already compiled and uploaded the VLUD sketch latest version.) + OBD connector. All soldered an ready.
  I've been working with arduinos for many years. doing home automation, c++ programming etc.
• a NAC radio unit WAVE2 (dab+ / dual LVDS) (OEM 9820469280).This is the NONE HD version. Taken from a Citroen C4 Spacetourer 2019 5 seaters. I have the VIN number also.
• a Touchscreen (OEM 9831652880). Taken from a citroen c4 grand picasso. This is the facelift version of the touchscreen.
• AliExpress SMEG=>NAC cable bundle

I assembled all the different parts with battery taken offline as I want to be careful

Now the big test:

When I start the ignition (motor off) then nothing happens on the touchscreeen.
It's all black.
I can start the engine. No problem.
I can still activate defogger button on the physical button on the touchscreen panel and a led indicates it has been activated.
No audio is coming out of the door speakers.
No FM white noise as happens when using the old SMEG setup. No audible beeps. Nada. Silencio.
The fan on the NAC is also not running. No idea if its supposed to ? Probably temp. regulated.

So I took a further look at the aliexpress wiring harness in order to make sure the 4 important wires are connected from one end to the other.
These are : 12+ / GND / canbus L/ canbus H

according to my multimeter the connection is fine.
I can measure 12v coming out of the aliexpress connector.
I have canbus L/H (OHM test on multimeter).
So the wiring harness is not the problem.

At this point I have only connected the big black connector on the NAC unit as well as 1 LVDS.
The one that goes to the touchscreen (the black colored one, the only one that fits).

So anything else have been disconnected. I want to rule anything else out.
Still same issue.

I tried connecting my arduino + laptop to the canbus of the car in order to see if the NAC is online or not.

PSA-Arduino-NAC.exe log file gives me.

Code: Select all

> 00
< 000000
> >764:664
> 1003
< OK

Its the same log output generated if I disconnect the OBD cable from the car.

I tried the arduino+MCP shield on a vanilla canbus sketch that merely logs anything happening on the can bus.
This works ok. Lots of chatter. Obviously I had to go back to the normal DB9=>OBD pin layout.
Using the left pinout:
So it seems the arduino is able to talk to the canbus.

obviously when using the VLUD PSA hack arduino hack I then use the appropriate pin layout as seen on the above photo (the pin layout to the right).

So for now I guess the conclusion is that the arduino finds no NAC unit

What are my options ?

return the radio as it's defective ?
(Funny thing is the seller has shown me a photo of the radio working. When it was in the donor car.)

Or should I try and start the NAC from my workbench and do some more troubleshooting there ?
How can I even the touchscreen connected on the bench ? wouldnt this require a BSI setup ?

For this bench setup I would need a 12v DC power supply.

Arduino connected to canbus L/H pins on the NAC radio as this is used to initiate turning it on.
How do I verify that the NAC unit is turned on ?
FAN movement ? audio from speakers ?

Or solely by interacting with arduino and using this to verify that the NAC responds or not ?

but before carrying on with this I would like to know if the NAC is supposed to start in my vehicle ?
Is it normal that NAC unit wont start as I tried doing in the car ?
The NAC unit was taken from more or less the same car (C4 spacetourer 2015, 5 seater 2019).

I tried installing my old SMEG radio and using the newer NAC compatible touchscreen. Just to see if my new touchscreen is the culprit here.
When testing this I can click on the physical buttons on the touchscreen panel and I can hear audio prompts for each of the presses.

The defogger button also works.
Nothing on the display though. My guess is the old SMEG radio uses another LDVS protocol that what the NAC system uses.

So you cant use a NAC touchscreen with an older SMEG radio. Atleast this is what I would guess.

I really dont know if the problem is the NAC unit or the touch screen itself ?
How can I isolate it any further than I already have ?

It would also be sad if I had to return the NAC unit back to the seller only to be told that it works in their end.
So I have to be 100% certain.

[GiveMeABreak]

Sorry, but I can't personally help you with this as the Forum is mainly concerned with repairs and issues with Original fitted equipment, not for fitting equipment not designed for the original vehicle. I'm not saying you can't do it, just that there will be little support here for this sort of thing.

[MacSlavko]

I am in the process of upgrading my old SMEG system (radio unit+touch screen) with a newer NAC system.
My car is a "Citroen C4 Grand Picasso 2015"

So I bought ..

• arduino + canbus shield 1.2 (already compiled and uploaded the VLUD sketch latest version.) + OBD connector. All soldered an ready.
  I've been working with arduinos for many years. doing home automation, c++ programming etc.
• a NAC radio unit WAVE2 (dab+ / dual LVDS) (OEM 9820469280).This is the NONE HD version. Taken from a Citroen C4 Spacetourer 2019 5 seaters. I have the VIN number also.
• a Touchscreen (OEM 9831652880). Taken from a citroen c4 grand picasso. This is the facelift version of the touchscreen.
• AliExpress SMEG=>NAC cable bundle

I assembled all the different parts with battery taken offline as I want to be careful

Now the big test:

When I start the ignition (motor off) then nothing happens on the touchscreeen.
It's all black.
I can start the engine. No problem.
I can still activate defogger button on the physical button on the touchscreen panel and a led indicates it has been activated.
No audio is coming out of the door speakers.
No FM white noise as happens when using the old SMEG setup. No audible beeps. Nada. Silencio.
The fan on the NAC is also not running. No idea if its supposed to ? Probably temp. regulated.

It would also be sad if I had to return the NAC unit back to the seller only to be told that it works in their end.
So I have to be 100% certain.

That's a great unit you've got (was looking for one myself...) and shame it won't work!
Been following your issue on VLud's page, but don't have any suggestions to add (seems you've run them all)...
I suppose you've tested AliExpress SMEG=>NAC cable bundle? Could be the culprit...
Do you have Denon speaker system (and a dedicated amplifier for the subwoofer in the boot)? That option should be set right with Arduino for the speakers to work...
Even if touchscreen is dead or not suitable to this NAC (don't know about that), you still shold hear the music from the spekers. And you guess right, you can't use the old one form SMEG.
As for the protocol, I'd say the SMEG uses the same as NAC since my conversion form SMEG+IV2 to NAC Wave2 went smoothly (DS5 2015, facelift).
My set is NAC 9821908880 and touchscreen 9813041280 + cable adaptors.
You get no Beep as the seller probably set it to your VIN already (that Beep goes form the speaker under the steering wheel).

Be curious to se (if possible) how the unit woud do in an another vehicle (if you can find one for test purposes), before you turn it back to seller...

[gibman]

Thanks for replying.

All is good now.

The NAC didn't power up because I was too gentle on the big black 50+ pins multi connector thus it wasn't fully inserted.
Once I pushed it in harder.. bingo. The speakers began with the expected 1sec beeping due to the the different VIN.

I quickly fixed this by running the arduino

Later I had a microphone that didn't work on the same NAC. Again it was due to me not pushing in the connector tight enough.
One needs to make sure the aliexpress harness is connected 100% tight in both ends.
Rookie mistake I know.

Once I had the NAC unit powered on in the car the next problem was being able to establish a connection with the NAC itself.
I was unable to connect to it on the bench using the bench low speed sketch.
Nor was I able to connect to it in the car in either low or high speed mode.

By a coincidence I figured out how to make a working connection in the car.
I could not believe it.

The NAC unit came installed with a very old F/W. (21.07.67.32_NAC-r0 2019).
I don't think it was ever updated by the previous owner.

With this particular FW version I had the above mentioned issues.
Serial Monitor, PSA exe, nothing worked.

I discovered the following:
1) connect OBD to car, and arduino to your laptop usb port.
2) turn on ignition, wait 1+ minute to make sure NAC is booted and ready.
3) upload low speed sketch to arduino
4) open the PSA-Arduino-NAC.exe, click arduino connect then nac/rcc access
5) PSA-Arduino-NAC.exe does not connect. fine close it.
6) upload high speed sketch to arduino
7) open the PSA-Arduino-NAC.exe, click arduino connect then nac/rcc access

It should now be connected !!!
In order to verify this I pulled the OBD cable.. then tried connecting using highspeed.
Didnt work again.
I had to start from step 1 through 7. Then I was back in business.

I then updated the NAC+maps to latest and now I can connect always using the OBD at hispeed.
No need for the above trickery.

So it might be related to a very old NAC fw version that I initially had on that NAC.

I did not modify my shield 1.2 version.
It had 120 ohm preinstalled as I could measure 120 ohm on can-H can-L using a multimeter.

Now I need to figure out what to do about the DAB antenna.
Currently I am running one of those cheap attach to window antennas. It doesnt exactly do wonders.
Funny if I open the side window then signal seems to be getting in. I guess the windscreen reflects UV, GPS, DAB.. well anything really
Pulling some new wires from the existing antenna along the ceiling is probably not worth it either. Too much hassle.

[mbprado]

That is really nice .

Just by curiosity, since you managed to make it work, after the change, you see both water and oil temperature gauges? Or only as it was on smeg?
This is something I was considering for few months. I also have a c4gpII, but I need to decide between the functionalities as Apple car and the new dash layout that nac provides, that is much less elegant than smeg+. Maybe just a matter to get used to that

Thanks!!!