Testbench setup?

[DrGER]

I have an MMI3GP bench setup with a NAR MU9498 J794, display, control console, CAN Gateway module, and diagnostics connector. It appears to work, mostly (the main unit, display, and control console all power up, I can run SD scripts, and log into the QNX system from a networked telnet connection) -- but VCDS cannot communicate with Address 5F over the MOST optical bus. VCDS sees the CAN Gateway at Address 19, but that's about it. Note that the J794 MOST LED is visible when it is powered on, but I see no LED lit from the CAN Gateway module when it is powered on.

In this configuration, the main unit shuts down after 10 - 15 minutes or so, regardless of any console activity, and I cannot initiate a software update from the Red Engineering Menu. My goals are to (1) run software updates from the REM and (2) keep the main unit running long enough to complete software updates initated in the REM.

Anyone here with recent experience with bench testing the older MMI3GP system that might offer direction to at least getting VCDS to find the running J794 over the MOST bus ? --g

 

[1975 Kombi]

Gateway and diagnostics connector at a minimum. You don't need ignition to enable dev mode

Any CAN gateway module? Or 2016 and up?

 

[flynhawaiian]

How does one hookup a J519 module from a 2018 S4 for a bench setup? Also, is it possible to hook up VCDS to that gateway, if so what wiring would someone need to set it up?

 

[fabltd]

If all you need is to send the T15 ON message to your seats, you don't need to install a MQB gateway. The arduino board with a Canbus interface will do the job right?

@Ronaldo

I know its an old post but do you still have your Ardunio code. I am trying to get a reverse camera module working and think I need to simulate ignition on.

+I would like to get RPM and Speed working on my test cluster.

Thanks

 

[fabltd]

Does anyone have a CAN bus dump for the steering angle sensor please ?

 

[fabltd]

jonese: Hi. PQ35 BCM..........hmm?

I'm more familiar with MQB platform vehicles, but just looking at your picture, it's not immediately obvious how your set-up generates its T15 rail. A PQ35 vehicle uses exactly the same method as MQB car in that the BCM generates lots of DIN 72552 voltages including T50, T75 rail voltages AND especially pertinent for a test-bench T15!

In early versions of my test-bench that didn't include a BCM, it was sufficient that I used a single-pole-singe-throw to create a T15 supply from the T30 rail. However, when I subsequently installed a BCM, this solution was no longer appropriate because the BCM itself generates the T15 rail.

My quick look at the WD for a PQ35 car suggests that the BCM controls 2 x T15 relays (J681 and J329) using pin T52B /12 depending on the model.

The reason why I mention T15 voltage is because on the other modules in my early test-bench incarnation, the appearance of a T15 voltage was sufficient to wake-up the module and to have the other CAN buses communicate through J533. However, I found to my chagrin, that a different process was needed to wake-up the BCM - it was necessary to simulate the ignition key switch-on process via the steering wheel module (see the picture below). Of course, in addition to the inclusion of the hex44 module, I then needed to simulate the actual ignition key switch (again see picture below). My assumption is from the need for these separate pieces of equipment that the BCM wake up signal is transmitted by a CAN message from the steering wheel module.

Of course, once the BCM was added to my test-bench, I was able to generate the T15 voltage in the proper way - I used an old 12volt relay that was triggered by the appropriate BCM pin and I removed the original single-pole, single-throw switch.

The same may be needed in your PQ35 case-perhaps?

Don

PS:As you can see from my picture, I also have a driver-door module installed on the test-bench, but this was not needed to wake-up the BCM (I added the door module for an entirely different purpose)

Hi - Do you skill have your PQ35 setup. I am trying to get a reverse module working and I think I am missing T15 to get it to turn on.

Do you have a Can bus scan to know what command is sent for T15?

 

[Ziddywerks]

I just want to ask a question. I do alot of bench work on vw/audi/porsche/lamborghini and bentley. I recently had an issue with a2014 vw jetta cluster on the bench. I had my powers ground and can lines hooked up to a regulated power supply and obd connector setup with a 120ohm terminating resistor and yet vcds was no able to talk to this cluster. The question is why? Cluster lit up and was on I was able to pull immo data using a different tool but vcds itself said communication was not possible. I don't think a gateway in necessary in this case no?

 

[Uwe]

I had my powers ground and can lines hooked up to a regulated power supply and obd connector setup with a 120ohm terminating resistor and yet vcds was no able to talk to this cluster. The question is why?

How many different CAN buses does that cluster have?

I don't think a gateway in necessary in this case no?

In principle, it shouldn't be, but we use have them on our test bench setups, and without snooping on the bus, it's pretty much impossible to say why VCDS didn't connect to it.

-Uwe-

 

[Ziddywerks]

How many different CAN buses does that cluster have?

-Uwe-

Good question I didn't look at the complete pinout, based on what i see in the WD only 1 can high and 1 can low nothing crazy.

 

[Eric]

VCDS will not attempt to connect to a UDS cluster if the interface can't retrieve a VIN or if there's no gateway. Those are conditions you'd find on a B7 A4, where trying to connect to the instrument cluster over UDS can trigger a DTC in the (IIRC) airbag.

 

[NEtech]

Yes, I also connect the Gateway, then it should be possible.

 

[Uwe]

VCDS will not attempt to connect to a UDS cluster if the interface can't retrieve a VIN or if there's no gateway.

Ah yes, I forgot about the instrument cluster exception, which exists to protect one particular thing in old A4s.

-Uwe-

 

[1SVK1]

With software version 21.3 and lower I can connect to the UDS cluster directly without a CAN gateway. I found this out by accident when I pulled out my old laptop.

 

[Sebastian]

Correct, but that old version will cause you a huge headache with some models/configurations. That's why the above mentioned fix was implemented and why current versions are a bit more careful. Other tools just don't care it seems.

 

[1SVK1]

I admit I can't assess possible problems.

 

[Sebastian]

I've mentioned this earlier but for any serious setup, especially where you switch between many components like different clusters and/or even platforms, I'd really recommend a generic setup that has received some more planning than just connecting wires. I've mentioned this before, but one of our German distributors has developed a pretty elaborate system for many such scenarios and plenty of customer setup/connectors available too.

My own setup based on the same system looks like this and while this photo is older, the setup is currently catering to MEB platform components just fine.

 

[nugentp]

VCDS will not attempt to connect to a UDS cluster if the interface can't retrieve a VIN or if there's no gateway. Those are conditions you'd find on a B7 A4, where trying to connect to the instrument cluster over UDS can trigger a DTC in the (IIRC) airbag.

That's kind of annoying for us bench jockeys where a gateway is not always available eg testing / tweaking a UDS cluster on its own... is there any consideration for a future advanced feature option to allow users to negate the need for the VIN check ?

 

[Sebastian]

You can pretty much grab "any" Gateway. Late 7N0 or 5Q0 etc will all do. It doesn't need to be a gateway from the same platform as the cluster.

 

[nugentp]

With software version 21.3 and lower I can connect to the UDS cluster directly without a CAN gateway. I found this out by accident when I pulled out my old laptop.

I am glad someone else found this issue as well - I used to be able to connect to UDS cluster on a 6R bench loom with VCDS, but after recent update I found that I was unable to do it again and I wondered if I was going insane (again)

I would like the option to back to the old way of working with an advanced option in the UDS config which negated the need for a CGW (or BCM).

 

[Sebastian]

Please see my replies, there are workable and low cost solutions. There are no plans to change this behavior.