C Crosser Diag Communication Problem

[bkod]

Hello there.
I have a similar problem with lexia trying to cooperate with c-crosser... No dialogue with any of the ECUs at all... ELM327 can read faults no bother. Lexia works fine with C4. Google told me that c4 and c-crosser use a different transmission protocols. Any suggestions what to do? Look for a fault in c-crosser's diagnostic socket or in lexia... A lot of people over internet points the relays onboard the pcb as very likely to fail for no obvious reason. Do you dear forum users have any experience like that?

[GiveMeABreak]

If you are using Lexia (standalone) - forget it, you need Diagbox as Lexia is too old.
If you are using Diagbox, then what version are you using?
The C Crosser is an all CAN multiplexed vehicle with 3 sub-networks. When did you buy your VCI? It may be a bit of hardware short of being able to communicate with later models.

[bkod]

Well... I used "lexia" in a wrong way... I ment VCI plus Diagbox. I have tried diagbox starting from 7.57 up to 7.62 and few different firmwares without any success... I'm getting tempted to order new hardware...
The one I already have seems to be a full chip one with blue varistor over the relays. It used to work with 07 c3, 08 c4 coupe and works fine with 05 c4...

[GiveMeABreak]

Ok, V7.62 is more than adequate for your ‘09 C Crosser, so what firmware have you uploaded to the VCI? It should apply the necessary firmware according to the version of Diagbox installed. Try downgrading the firmware i by one version and retry each time to see if that helps.

Failing that it might be that the wires are lose or the solder joints might have come away. It can be a common issue.

[bkod]

Would it work with c4 with loose wires? I'll have a look inside with multimeter and soldering iron. I have downgraded to few different firmwares, can't tell you now to exactly which ones, but DB flashed it back up anyway.

[bkod]

Would you, by any chance, be able to point where in Sedre I can find diagnostic socket pinout? Is there a difference in pinouts between c4 and c-crosser?

[GiveMeABreak]

There shouldn’t be any differences at all, as the only vehicles that need a different connector are the commercial range with Fiat influence that require the S1279 module. The C Crosser does not need a different connector.

There are more differences in the full-chip hardware, the full chip units have the 10k resistor that is missing on lessor kits, and all the missing octocouplers and some other parts.

The non full chip kits without the specific resistor wont work on the C5 and some Peugeot models too.

[bkod]

Would that be the reason of my problems?
Those 2 white ICs on the left hand side seem to be burnt and cracked.

Does anyone know their proper name?

Relay

Found another problem too... One of the relays hardly soldered onto pcb...

Relay

[GiveMeABreak]

I think you might have found the problem (s).
These units are super sensitive, I treat mine like a box of eggs.

[bkod]

New optocouplers have been ordered. We'll see how it goes.

[bkod]

Very interesting read:

https://www.drive2.com/l/466072809605431953/


https://www.drive2.com/l/467734721430815547/
https://www.drive2.com/l/467534885192466795/

[GiveMeABreak]

The quality of these units AND components used varies considerably. Lesser units will have issues with the 308 and the C5.

The RAM chip is another failing on these, but short of a bit of a bit of soldering this sort of component failure may be beyond the casual DIY mechanic. They just want the thing to work and another reason to treat the units with kid gloves I would suggest

[bkod]

Got it fixed! Thanks to the Russian guy's tutorial. I measured continuity of all the relays and found out K8 wasn't soldered properly. That's the one responsible for CANcommunication.
Now lexia recognises VIN and most of the ECUs and reads them.
Still waiting for the optocouplers. Maybe they are the answer.
But so far so good.

[GiveMeABreak]

Well done, as I said, they are very fragile and often suffer from weak soldering, especially this lead free stuff.

[bkod]

Unfortunately new optocouplers haven't resolved remaining communication problems.
I will probably try to replace the relays with a set of decent ones.