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-   -   VCDS (Vag-Com Diagnostic System) for VW & Skoda - Discussion Thread (https://www.team-bhp.com/forum/technical-stuff/152370-vcds-vag-com-diagnostic-system-vw-skoda-discussion-thread-65.html)

I will refuel and then check again for Jetta.

for instruments, 31347 worked once, will check again.



Quite frankly, even I am surprised.

31347 did work for me, but I don't know what to do after this step, still figuring out VCDS.

Using the real-time monitoring, my Kushaq 1.0 AT (post official AC update), the evaporator was cutting of at 3 degrees, and vents were at 9-10 degrees.

One noob question. what's the best way to understand long coding, without messing anything, and how does one take a back-up for full reset later, if required.

Long coding is usually a string in HEX (Hence the name HEX in the cable). Each component has their configuration embedded within the string.

An example of an ABS module is below:

Address 03: ABS Brakes (J104) Labels: 5Q0-907-379-IPB-V1.clb
Part No SW: 5Q0 614 517 CG HW: 5Q0 614 517 AG
Component: ESC H62 0643
Revision: 00000000 Serial number: 60778000000007
Coding: 0AEE929A34200B6D4777070662CB4950492CD0E2E046923D20 605008420A4200002F641A1B13111435351919323200

Notice the hex string beside Coding:. To perform long coding, we would need to understand what each byte corresponds to. VCDS makes it easier with the long coding helper OR you could use basic settings menu.

To make changes, you need to ensure you use security access (SA). Without SA you might not be able to write back to the module.

A backup would essentially be the long coding string saved prior to making changes in any module

Hope this helps

Note: I am not an expert. The details above are based on my understanding. Experts - please feel free to chime in

Looks like your car AC should be fine now. Default evaporator cut-off was at 3.5 degrees and vent temperature was higher than 15 degrees even when it was cold outside.

Just to add to the good explanation by eagle_bush, If you come from electronics/CS background, you would be aware of how a bit string can be used to derive some values, or in opposite how you can set different bits in a huge string and make sense of them. For example, a simple 32 bit string along with the byte will be like this:

Bit 32 Bit 0
0000 0000 0000 0000 0000 0000 0000 0000
Byte 3 Byte 2 Byte 1 Byte 0

Now I can develop the ECU software to read these bits and then react to certain values. Like I use bit 0 to turn on and turn off 120/80kmph speed alerts. Hence, if you set bit 0 to 0, the alerts are off and vice versa. My software will already have provision to react for the change in this bit and it does not need to be reprogrammed.

Like this, for every ECU, there will be tables to represent what these bits and bytes mean. For simple switches, a single bit is enough to turn on and turn off some logic. For complex things like setting minimum temperature etc, more than one and upto four bits can be used. The collection of multiple switches will form a long coding string. Based on which bit or bits are modified, the ECU behaviour will change. And these have to be valid bits which are a part of the software logic. Like if my AC controller can accept values 0-3 for AC strength, 4 will be unacceptable.

Softwares like VCDS decode these bits based on pre information they have for every ECU and hence will allow you to set them in a user friendly manner. In the industry, these codes are provided to the part supplier who might not always know what the whole string means and will just write it into the ECU while producing it. Generally ECUs dont accept values the software isnt programmed to understand and you can see this happening in VCDS where the controller will refuse the coding.

When ECUs were simpler, long coding would cover whatever changes had to be done but now with increasing complexity, adaptations have been added. This will provide a larger space for changes and each adaptation is linked to a channel, which is a location in the ECU memory. Compared to this, the long coding is a single memory location.

Always keep backup of the stock codes and adaptations before you experiment. In case of emergency, you can always find the previous changes in the logs folder of VCDS. Recently I had enabled some random flag in the long coding of instruments and that was resulting in a DTC in the instruments. I was not sure what I changed and hence checked the logs from November last year and successfully rolled it back.

I will compile a list of Dos and Donts while using VCDS sometime soon.

This is super helpful... thanks a ton! :)

I am not an engineer, but I love all things automotive and VCDS is super interesting...

Played around with VCDS over the weekend, and was able to do the following:

1. Jetta: Activated auto-folding ORVMs (God knows how much I've wanted this), all thanks to BHPian Sarfraz1997, quoting his post (from May 09, 2020) for others who may need it.



2. Kushaq

MID Tweaks:
- Oil Temperature
- Refuel Quantity
- Speed Alarms Turned Off
- Steering Angle Display

HVAC
- Fan Speed Display in Auto Mode
- AC Tuning Changed to Cold Tuning; More Air (this also happens to be the default setting on my Jetta, but the Jetta doesn't have evaporator temperature option)

I need help with the following:
- Lane change clicks from 3 to 5
- RPM bar in Virtual Cockpit
- Steering Setting to Dynamic

Lastly, please have a look at this video, would this be safe? I'm not a fan of DRLs; and would rather keep them turned off. I have a hunch this may work as in the video but was sceptical to try without a second opinion.

Activating DRL on/off setting in Infotainment

I have this setting from factory on my MY19 Octavia. It is helpful if you would want to turn off the DRL.

I prefer to leave them on for safety reasons.

I've been trying to understand VCDS over the past few days and was able to successfully make some tweaks, however, I've also hit a few roadblocks and need some help.



Image 1: DRL only when Light Switch on Auto (for Kushaq) - Which option to pick in this situation?




Image 2: VCDS Language: My version of VCDS is a mix of English and German, is this okay?




Image 3: Adaptation vs. Coding (for Kushaq) - I was unable to get the Oil Temp display through adaptation, but it worked by changing Long Coding - is this normal?




Image 4: Comfort Turn Signal 3 to 5 Blinks (for Kushaq) - Is this the right option?




Image 5: Auto Scan/ Gateway Installation - These features work when I start VCDS, but after a few minutes I get this License pop-up. Should I re-install or ask for a fresh copy from my seller?




Image 6: VW Jetta MT 2.0 TDI (MK6) default AC Compressor Setting - Sharing for reference. Thank You BHPian Audioholic, this change made a huge difference to my Kushaq's AC. :)

Can anyone suggest from where I can buy OBDeleven in India , I don't mind even a used one as I would be using it occasionally. I saw the option to buy it directly from OBDeleven website but not too sure if I will face any hassles with customs. I don't have anyone in from circle who will be coming to India from US or Europe at least for next 6-8 months else would've asked someone to carry it for.

I would've considered VCDS but as it doesn't support Mac and I'm not compatible with windows so had to rule it out.

Thanks !

Order it directly from the website and if possible choose a premium shipping option. Generally goods shipped from the EU are never looked into much and even goods from China/SE Asia are pretty smoothly processed by customs. If its sent by government post like Deutsche Post of Post NL, it will take some time for customs to clear it but since they invoice it clearly, you will only end up paying customs as per the actual rate.

If they choose to send it with a premium service like Fedex/DHL then it will arrive really quick and customs will be cleared easily, except that you will end up paying extra to the shipper for this in terms of processing charges in addition to the duty payable. But there are hardly any chances of it getting stuck somewhere or similar.

Thank you for the detailed response , this really helps. Will place an order directly with them in few days :Cheering:

Did this change, benefit the cooling effectiveness of your Jetta? Also, what change did it make? For example, did it increase the fan speed or is their any change in the way the compressor behaves?

Thanks!

I did not change anything on my Jetta, the stock coding works fine for me. I had shared the image for reference.

However, I did change the setting in my Kushaq to Cold Tuning, More Air (original setting was Moderate Tuning) after reading about it in BHPian Audioholic's post. My car has received the software update and coupled with this change the AC has become very effective.




Hello everyone, any help/ guidance on these items? :sadface

Glad that the AC tweaks have worked for you.

1. I havent explored the settings for turning off the DRL but have tried around switching DRL off with handbrake. There is a straight forward adaptation for that.
2. The adaptations are specified by the part supplier and is just read by VCDS. Hence it is a mix of German and English.
3. The Instrument cluster made for MQB IN models are not correctly decoded by VCDS yet. Hence there will be some ambiguity.
4. Yes thats right
5. This is why you need the loader.

Thanks a ton, this is super helpful.. :)

Will get a fresh copy of VCDS (with Loader) from the Seller.

Thanks audioholic. Even I am planning to get one and in a similar dilemma of customs duty.
However I also saw this product on ETSY. Any idea if we can order this via ETSY and not get into customs scanner ?

Got the Loader to work, license prompts have gone away now.

Latest tweaks:

Jetta
- Rain Closing (with enable/ disable option in MID)

A6
- Cornering Lamps (with steering angle change and/or indicator on)
- DRL on/off option activated in MMI

Kushaq
- RPM Bar display in Virtual Cockpit



@Audioholic Can you help with DRL Off When Handbrake On for Kushaq?

Lastly, for MQB AO IN, has anyone figured out the following:

1. Lowering of Left Outside Rear View Mirror upon selecting reverse gear?

2. Reducing Auto Lights Sensitivity? (for delayed activation)