2012 Golf TDI - No Dash, No Crank, No Horn, No Comm

[Dr Sheldon]

Okay, I finally found and removed the gateway. It was really up in that dash.

PN 7N0 907 530M

I have no idea how to test it - I'm thinking I'll just order a known good one off eBay instead of $275 for a new one. There are also Chinese versions on Amazon...thoughts?

The way to test it is to isolate it from the car electronically keeping and confirming the Power supply to it - It is connected and can be interfered with by every communicating module in that car - Which is likely all of them !!

Until such time that you can establish communication with the gateway you have ne reason to look any further into that car

I reckon you nipped a wire or 2 whilst you had that engine rockin and a rollin ?

 

[Dr Sheldon]

Hi-

I did some work on my friend's 2012 Golf TDI

I reconnected the battery and went to start the car - nothing! Start button does NOTHING, dash does not light up.


I appreciate any help you guys can give.


Thanks!

Get a new friend !!

 

[MrMeeseeks]

Get a new friend !!

I have to wonder, are you a in real life? Or just online?

 

[Uwe]

I replaced the DPF with a less-restrictive exhaust pipe per the vehicle owner’s request.

Are you sure you want to admit an act that would subject you to something like a $10k fine by the Feds in a public forum?

-Uwe-

 

[JMR]

What s with all the ruckus between members ???

 

[Uwe]

What s with all the ruckus between members ???

Good question. I wish I had a good answer.

-Uwe-

 

[Tharkhold]

I never thought I'd be looking at a VCDS threat with a bag of fresh popcorn... haha

But seriously,


As for the gateway, the easiest way (and cheapest/most independent way) would be to do a basic testbench.

You'd need a ODB2 receptacle socket; wire Can H/Can L, 2 x 1x+12V power wires (30a and 15a circuits) , GND to a J533 socket.
Run the +12V/GND to a 12VDC wall adapter.
Run a +12ACC/ignition wire from the relevant Gateway pin/socket+odb socket to the +12V source (to simulate ignition switch).

Plug in Gateway, then power up, then VCDS cable on ODB2 socket and you should be able to scan the gateway (if it shows). If it's dead, you wont be able to reach it.

Having access to a junkyard self-pull you can easily rip out the ODB2/pigtail and J533 (along with its plug/pigtail harness) in less than 30 minutes. If you have more time you can probably fish out the CANH/CANL wire pair between the two and save a soldering job, but that requires patience and a steady blade

You can find +12V 1-5Amp home/mains DC adapters on amazon/etc.

Note: VW diagram refer to the ODB2 socket as "U31", and the Gateway as the "Diagnostic module/etc"

Note2: "15a" and "30a" are DIN std circuit labels. The "a" doesn't mean "amps"


From memory/my own stuff (This is to show the simplicity of what is needed - DOUBLE CHECK ON ERWIN FOR PIN NUMBERS):

 

[Uwe]

From memory/my own stuff

Neither pin 1 nor pin 5 are needed on the OBD-II connector to get communications.

-Uwe-

 

[Dr Sheldon]

I have to wonder, are you a in real life? Or just online?

This is Real Life !!

I work amongst 35 technicians (almost all male, Young, Dumb & full of *um !!!) its not a huge workshop.

So there is always a bit of banter going on. If it is of any comfort to you I can assure the stuff I post is mild !!


On a serious note I did say it as a joke - and this !!

Are you sure you want to admit an act that would subject you to something like a $10k fine by the Feds in a public forum?

-Uwe-

And now we know why you were reluctant to disclose that !!!


Anyway - Move on and see if we can help get the old girl fired up !!

When that happens it may be a good Idea to dress and decorate your spare / guest room !! You may as well move your friend into that room

Some leave from work would not be the worst idea !! Of course I am the Alarm here guiding you to be prepared !!

 

[Dr Sheldon]

I never thought I'd be looking at a VCDS threat with a bag of fresh popcorn... haha

But seriously,


As for the gateway, the easiest way (and cheapest/most independent way) would be to do a basic testbench.

You'd need a ODB2 receptacle socket; wire Can H/Can L, 2 x +12V power wires (30a and 15a circuits) , GND to a J533 socket.
Run the +12V/GND to a 12VDC wall adapter.
Run a +12ACC/ignition wire from the relevant Gateway pin/socket+odb socket to the +12V source (to simulate ignition switch).

Plug in Gateway, then power up, then VCDS cable on ODB2 socket and you should be able to scan the gateway (if it shows). If it's dead, you wont be able to reach it.

Having access to a junkyard self-pull you can easily rip out the ODB2/pigtail and J533 (along with its plug/pigtail harness) in less than 30 minutes. If you have more time you can probably fish out the CANH/CANL wire pair between the two and save a soldering job, but that requires patience and a steady blade

You can find +12V 1-5Amp home/mains DC adapters on amazon/etc.

Note: VW diagram refer to the ODB2 socket as "U31", and the Gateway as the "Diagnostic module/etc"

Note2: "15a" and "30a" are DIN std circuit labels. The "a" doesn't mean "amps"


From memory/my own stuff (This is to show the simplicity of what is needed - DOUBLE CHECK ON ERWIN FOR PIN NUMBERS):

@Tharkhold

I have this from ERWIN for another car - However I do not see in this thread a Build Year nor an Engine Code so cannot look up accurate info.

However - like your thinking !! Proper Logical Robust Methodical Approach to this fault / Symptom

Pin 9 or/br > DLC 14
Pin 19 or/bl > DLC 6

Pin 1 rt/ws > SB24 Fuse
Pin 11 Br > Ground

Pin 14 > Sc7 Fuse

 

[marty_seguin]

Thanks for all the information and entertaining dialogue

I’m going to get a known good gateway from another vehicle, and plug it in. It might solve the problem. If it still doesn’t work, then I will have to dive into actual electrical troubleshooting.

 

[Dr Sheldon]

Thanks for all the information and entertaining dialogue

I’m going to get a known good gateway from another vehicle, and plug it in. It might solve the problem. If it still doesn’t work, then I will have to dive into actual electrical troubleshooting.

Thanks for all the information and entertaining dialogue

I’m going to get a known good gateway from another vehicle,

Be sure the Part Number is identical !!

 

[Dr Sheldon]

Be sure the Part Number is identical !!

Pedantic and the perfectionist that I am - Would it not be sad if the fault in your car, in which you have rattled from pillar to post the Engine like a rag doll , was to destroy the "Known Good and demote it to "Was Good" RIP ??

Can Gateways do not die of boredom nor hard work - Milliamps travel through them - No moving Parts !!

One of us has not thought this through !!

 

[Tharkhold]

Neither pin 1 nor pin 5 are needed on the OBD-II connector to get communications.

-Uwe-

Ah, I take it pin 5 is pin 1's ground, and the 15a circuit doesn't need to get energized (for this simple case).

That makes it even simpler.

I updated my drawing & credits

Cheers

 

[Dr Sheldon]

Ah, I take it pin 5 is pin 1's ground, and the 15a circuit doesn't need to get energized (for this simple case).

Cheers I'll update my memory

Pin 4 & 5 are ground

4 = Chassis Ground
5 = Sensor Ground

Most WD's I have looked at do splice the pair together !

Pin 1 - that is an option for the VM - Often used as Ign On. Mb I think has it for Rpm (Pre CAN)

 

[ED30R]

I’ve seen plenty of dead gateways usually from water damage, if I remember rightly you will always get ignition and cranking but a load of lights on the dash, immo active and the stereo will say safe as there is no communication with the clocks.

 

[Dr Sheldon]

I’ve seen plenty of dead gateways usually from water damage,

Absolutely agree!! - BUT this was on the table having its intestines removed !! ??

Concussed - Battery off !!

 

[ED30R]

What was removed to do the dpf delete? Nothing electrical apart from egt, dpf and lambda probe plugs, driveshaft. There’s nothing that can really create the issues you describe.

Have you tried going directly to any modules through SELECT and not AUTOSCAN with the ignition on.

 

[Dr Sheldon]

What was removed to do the dpf delete? Nothing electrical apart from egt, dpf and lambda probe plugs, driveshaft. There’s nothing that can really create the issues you describe.

Have you tried going directly to any modules through SELECT and not AUTOSCAN with the ignition on.

YES - Even if the Can Lines were chopped up, Shorted etc in the engine bay - Comms with CGW is a given !!

More to this "STORY"

A photo of Op's 12/24v Boost Pack may help ? And a Close up of the battery / Jump Terminals in the car may add to that help !!

 

[ED30R]

Imagine that