Can I get the code from a J519 - Onboard Supply Control Unit

[Dr Sheldon]

What I cannot understand is the CanH and CanL at the OBDII. with key off, I have 10.8v on BOTH Can wires (obviously not good) With Key ON, I get 12v on BOTH can lines. I wanted to know which side of the circuit the voltages are coming from, so I removed (de-pinned) both CanH and CanL at the OBDII and rechecked voltages on the Can wires at the OBDII. Voltages remain the same. So I re-pinned the OBDII and read voltages again with key ON and OFF and at the same time as reading voltages, I disconnected the J533, voltages go away. So I have to assume the voltages are getting on the Can wires from the J533.

Pins 6 & 14 at the DLC are connected directly to the J533 pins 9 & 19

And you cannot measure voltages on those lines

First it is a Digital Data - you will need a scope
Second, unless you got a diagnostic tool connected and communicating you wont see what a lot !!

 

[Dr Sheldon]

The FACT remains that you claim to have Coded the J533 on the bench !!

Now repeat that in the car !! Not a big ask !!! Is it ??




Have you been Hacked ?

 

[hillburnsh]

The FACT remains that you claim to have Coded the J533 on the bench !!

Now repeat that in the car !! Not a big ask !!! Is it ??




Have you been Hacked ?

it is a big ask. Do you know how to code the J533? You have too REMOVE the J533 from the vehicle. Then connect the powers (15 and 30), ground, and Can wires to the J533 PINS. How the hell can I do that if the pins are connected to the F'n car?

You cant measure voltages on Can wires? Most certainly can measure voltages on Can wires.

have you been hacked?

I will connect a scope on those lines and see if the voltages of nearly 12v magically disappears and becomes 0V. Care to make a wager?

Then I will remove the J533, connect it to the VCDS on the bench and post a picture of "how" I coded it with hope that it will finally become clear to you.

 

[hillburnsh]

 

[hillburnsh]

IT WONT LET ME POST PICTURE OF SCOPE MEASURING THE SAME VOLTAGES ON THE CAN LINES YOU SAY i CANNOT. BUT THE VOLTAGES AREN THERE EVEN ON THE SCOPE

 

[Bruce]

IT WONT LET ME POST PICTURE OF SCOPE MEASURING

See the "How To" in the blue bar at the top of the page. The instructions can be found there.

You may want to find your CAP lock button.

 

[Dr Sheldon]

No point in having that attitude but you carry on -

I know how to fix that car and getting communication with a module should not take this much effort - really shouldn't !

it is a big ask. Do you know how to code the J533? You have too REMOVE the J533 from the vehicle. Then connect the powers (15 and 30), ground, and Can wires to the J533 PINS. How the hell can I do that if the pins are connected to the F'n car?

Those "Diagnostic CAN" wires from 9 & 19 J533 go to Pins 6 & 14 of the DLC - So pins 6 & 14 of the VCDS dongle

You cant measure voltages on Can wires? Most certainly can measure voltages on Can wires.

My bad !! You cant measure Can Signal Voltages with a meter - has to be a scope !

have you been hacked?

I will connect a scope on those lines and see if the voltages of nearly 12v magically disappears and becomes 0V. Care to make a wager?

Please dont go on trying to teach me basic Electrical Testing - I mastered that 50 years ago !!


It wont disappear - But again if they remain constant at 12v and do not meet the criteria of CAN signal then that 12v is wrong !!

ALSO - You need a scan tool connected to wake up that data lines

Then I will remove the J533, connect it to the VCDS on the bench and post a picture of "how" I coded it with hope that it will finally become clear to you.

Well that is fine - You have communication with it - to be able to code it ??

Is that correct ??

 

[hillburnsh]

No point in having that attitude but you carry on -

I know how to fix that car and getting communication with a module should not take this much effort - really shouldn't !


Those "Diagnostic CAN" wires from 9 & 19 J533 go to Pins 6 & 14 of the DLC - So pins 6 & 14 of the VCDS dongle




My bad !! You cant measure Can Signal Voltages with a meter - has to be a scope !




Please dont go on trying to teach me basic Electrical Testing - I mastered that 50 years ago !!


It wont disappear - But again if they remain constant at 12v and do not meet the criteria of CAN signal then that 12v is wrong !!

ALSO - You need a scan tool connected to wake up that data lines



Well that is fine - You have communication with it - to be able to code it ??

Is that correct

If i remove the J533 and put on my bench to code it, yes I can communicate with it that way.

If it shouldnt take this much effort, then please tell me the next step, because im lost. I see 12v on the can wires and I know that is not good and I believe that is what I cannot communicate with it at all while its in the car. But I have no idea how in the hell voltages that high are getting on the bJ533 can wires.

 

[Uwe]

I have no idea how in the hell voltages that high are getting on the bJ533 can wires.

Is there any termination on your CAN wires? If you're measuring this with a very high impedance meter and have no termination on the bus, the voltage might be that high due to leakage current in the drivers.

-Uwe-

 

[Dr Sheldon]

Is there any termination on your CAN wires? If you're measuring this with a very high impedance meter and have no termination on the bus, the voltage might be that high due to leakage current in the drivers.

-Uwe-

Yes but if he is looking ONLY at "Diagnostic CAN" between 9 & 19 Gateway and 6 & 14 DLC WITH A SCAN TOOL ATTACHED then all the termination required will be there ,,,

Just as if it were in the car !! With every thing de pinned except power, Ground and one PAIR of Can lines to DLC !!

Not Every Can Network needs termination Resistors ? ! The slower ones often dont have them !! Ones at 500kBs almost always do !!

The HIGH 12v he is claiming is not yet measured with a scope ??


OP claims he can Communicate with J533

If i remove the J533 and put on my bench to code it, yes I can communicate with it that way.

Then there is no reason so far he cannot do the same in the car ?? Is there ??

I now would depin or cut every wire other than the 5 above - Confirm the Powers and grounds - Confirm the DLC wires are not contaminated and then look to communicate with scan tool !!

Has he followed the good robust advice ? DLC wire contamination ??? Cross Contamination ?? High Resistance. Open ????


So far the evidence is overwhelming -

He is not here to fix his car !
He is here to Row and Nit Pick with me !!



FFS with the amount of Scientifically correct Guidance he has been furnished with, this should have been nailed last month !!

He can get J533 to talk on the bench but not in the car - Show me a 2 Videos PLEASE !!!

There, for sure, is a story here that OP is reluctant to divulge - Made more obvious in his aggressive / tantrum like replies !!

 

[Dr Sheldon]

If i remove the J533 and put on my bench to code it, yes I can communicate with it that way.

If it shouldnt take this much effort, then please tell me the next step, because im lost. I see 12v on the can wires and I know that is not good and I believe that is what I cannot communicate with it at all while its in the car. But I have no idea how in the hell voltages that high are getting on the bJ533 can wires.

Are you communicating on the Bench with 12v on the CAN WIRES ???

My friend - You are delivering facts similar to that of a Cheap Chinese Watch !!

For reference and context - My knowledge of Can Networks is Recognised & National Award Winning

 

[hillburnsh]

Are you communicating on the Bench with 12v on the CAN WIRES ???

My friend - You are delivering facts similar to that of a Cheap Chinese Watch !!

For reference and context - My knowledge of Can Networks is Recognised & National Award Winning

You know what. I'm over your unjustified disrespectful comments. And you started that bullshit on Day 1. So....go fuck yourself

 

[Dr Sheldon]

 

[Uwe]

So....go fuck yourself

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-Uwe-