Cruise Control Not Working? Troubleshooting Guide.

Hello,

Approximately 1.5 years ago, I installed and activated a cruise control (GRA) system in my Passat 35i AFN.
It didn't work, though. After a long time, I finally had the time and motivation to investigate, but it still doesn't work.
The following actions were taken:

- Pins for switch positions, clutch, and brake checked with VAG 1551 - OK.
- Checked continuity of 3 cables to the control unit - OK.
- Switched the switch with another one - still doesn't work, so the switch is fine.
- 4. When the ignition is turned on, the cables receive a 12 V power supply.

Ich weiß echt nicht mehr an was es liegen könnte. Ist mein Steuergerät kaputt? SoAnything is possible.
Could there still be something adjusted incorrectly on the pedals, even though the pins seem to be fine?

Hoping for new ideas!

Best regards, Albrecht.

I recently experienced something similar with an Octavia.

Even here, the cruise control didn't work, despite being installed and activated correctly.

The cause was the contact for the CANCEL function. The on/off switch is actually a two-pole switch. The second contact can be accessed with a sliding switch to temporarily disable the GRA (presumably a specific function). On the multifunction steering wheel, this is then a dedicated button.

This contact was not activated by the GRA lever and remained at 0 constantly.
-> Cruise control not working.

CU Gremlin.

and how did you solve it now?

Sure, here is the translation of the text from German to English:

'MFG' is an abbreviation for 'Mit freundlichen Grüßen,' which means 'Sincerely' or 'Best regards' in English.

You can read that out using VCDS. For each function, there's a single bit that changes state when the switch is activated or not.
After that, you can definitely say what the cause is.

So, the situation is like this...

We installed an additional wiring harness for the interior lighting in a 2004 Ibiza 6L BPX, along with the corresponding switch.

So far, so good.

Activate cruise control (on a Seat)...
But it doesn't work!!!

Now we were troubleshooting, as described in the EBA (Environmental Impact Assessment).

Everything is fine, except for: 'Switch B must be set to 'OFF' before the power-on point.'

He didn't know what that meant... and neither did we...

The display should show '000001'...

Does anyone here have the solution to this riddle ?


Best regards,
Marcus

I suspect that it means you should slide the switch towards the "off" position, but only up to the point where the switch will permanently turn off.

"But that has nothing to do with the functionality! It simply doesn't work if the clutch is depressed (or the switch is defective), if the brake is depressed (or the switch is defective), and if the slider is moved to the position mentioned above (or, again, the switch is defective)."

However, all of these functions can be checked by examining the bit sequence. Simply check the bits; whenever the clutch is engaged, the brake pedal is pressed, or the lever is moved, a bit must change. If it doesn't, then the error must be located there.

I might go to Seat again tomorrow, if I have the chance.

WHAT exactly do you mean by 'bit order'?

The has apparently tested 'EVERYTHING'... and it seems that everything was fine with the clutch and brakes.

In the MWB 6, you can see a multi-digit number in fields 3 or 4. These digits represent individual bits that respond to inputs from the GRA (presumably a sensor or control unit). The first four digits were, to my knowledge, responsible for functions like disengaging the clutch (e.g., brake pedal pressed), while the remaining digits controlled functions like setting the acceleration.

Do you mean this?

http://foto.arcor-online.net/palb/alben/08/379508/1024_3332656233346338.jpg

According to Seat, everything should be fine.

Make sure to set switch B to the OFF position before the power-on point.

He didn't know what to do with that...

Could it just be a power outage, or something like that?

What is the white cable actually for?

Is that the gala/speed signal???

Sure, here is the translation of the text from German to English:

'MFG' is an abbreviation for 'Mit freundlichen Grüßen,' which means 'Sincerely' or 'Best regards' in English.

As I mentioned, as soon as you move the switch towards the "off" position (but without fully engaging it), the cruise control deactivates. If you release the button, the cruise control remains active and can be reactivated by pressing the "set" button. If you fully switch to the "off" position, you can't reactivate it with the "set" button.

Are you sure the 6L can do that?

For example, this wasn't possible in the G3, as the switch could only click into the off position, the on position, or the RES (reset) position.

There's no option to type it out.

m;

Yes, I installed them myself! (in my old Colour Concept).

It's possible that the system can't do that, but you can see in the next field whether it changes after being activated, or whether it remains the same.

Could the standard Golf 3 GRA lever be bypassed?

Mine couldn't do that - I'm pretty sure of it.

m;

Perhaps there were different versions? I also bought mine originally, so it wasn't from a different model or anything like that.

or did you get yours from the factory? (it's possible that something else was added later).

No.

mine was retrofitted by the dealer in 2002 (after I explained to him that it was possible and how to do it ).

I can double-check, because I actually sold that Golf to a friend.

m;

EDIT: According to the wiring diagram, the G3 cannot actually distinguish between "power off" and "power off due to inactivity" (so it cannot be using 2 bits).

It's possible that the detent mechanism was simply slightly misaligned from the electrical contact, causing it to randomly trigger the "tip" function.

Are you sure the cruise control is activated?
Take a look here:

Select engine control unit 01.
"G00SG" in the identifier stands for: GRA enabled.
"00SG" in the identifier stands for: GRA, not activated.

Select "Login" function. 11.

code: 11463 -> Enable GRA.

Okay, I'm ready.

I'm assuming you've connected the cables correctly. You had to remove the red/white wire and reconnect it to the original one (power supply). Do you have the model with the round pins (manufactured before August 1997) or the one with the square pins (manufactured after August 1997)?

Have fun!