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?