JB4 G5 install fail. But why?

[AP135]

Hello all,

So my amazing BF bought me a JB4 for my car, which we tried to install yesterday night, only to find that the car would stall straight after we turn on the engine.

We checked all the connections multiple times and everything seems to be correct, but the car just didn't seem to like it. When we took out the tune, the car started up fine again.

Given that everything seems to be connected correctly, I am at loss to know what the issue is. Has anyone experienced this before? Or have any suggestions on what else to try/check?

[Knightelf]

N54 or N55?

Best bet would be to email mike@burger

[AP135]

Originally Posted by Knightelf

N54 or N55?

Best bet would be to email mike@burger

N54...

Sorry, I am pretty new to the forum. Who is mike@burger?

[Curare86]

Originally Posted by AP135

N54...

Sorry, I am pretty new to the forum. Who is mike@burger?

Mike is one of the vendors for bms stuff. I think terry would be better; he designed the jb4. If you go to the burger motorsports website you can email him for support

did you try cycling through the steering wheel controls before starting up the car to see if the jb4 was working?

[skidz]

did you connect the power to the jb4?

[m4xm1l10n]

terry@burgertuning.com

He answers quick

[froop]

Originally Posted by Curare86

Mike is one of the vendors for bms stuff. I think terry would be better; he designed the jb4. If you go to the burger motorsports website you can email him for support

did you try cycling through the steering wheel controls before starting up the car to see if the jb4 was working?

Didn't try that actually. Might try to reinstall it tomorrow or tonight and check it out.

Might double check all the black wires and red wires are where they should be. If still no good I'll take a photo and put it up on N54tech.

Definitely everything was plugged in though. Power cable, USB, all sides of the harness.

Only the brown CPS wires were left unplugged. The harness we have does have a blue and a red cut wire sticking out of the end of the harness though. Not sure what that's for though...

[froop]

Hey guys,

I tried it again this afternoon but I'm getting the same problem.

Engine takes 5 seconds to crank and then finally starts before getting a half engine light, stalls after 2 seconds and then I get the "take the car to the dealership" light (car on a lift).

I've attached some photos of the install. If someone who knows JB4s please take a look and let me know if I've done anything wrong, it would be much appreciated.

I posted it up on N54tech as well.

[Simonnn]

Have you double checked the connectors which slide in? (can only go in one way). I was stupid enough to put mine in the wrong way around the first time I installed my JB4 and had similar issues you're having when trying to start the car up

[froop]

Originally Posted by Simonnn

Have you double checked the connectors which slide in? (can only go in one way). I was stupid enough to put mine in the wrong way around the first time I installed my JB4 and had similar issues you're having when trying to start the car up

Yeah I've tripled checked them. The black wired subconnectors go into the longer clip and the red wired subconnectors go into the shorter clip. Within those, they can only be slid in one way and also only on one side of the clip. I've also cross checked with the photos on the install guide and everything matches up.

[JB4-335]

Hey Alex, I'd be happy to check it out for you but im in LA at the moment. Will be back early December.

[froop]

Originally Posted by JB4135

Hey Alex, I'd be happy to check it out for you but im in LA at the moment. Will be back early December.

Thanks Edwin. If I haven't figured it out before then I might drop by your place and try work out what the problem is. I have a feeling it might be the harness.

[Gumball]

Happy to help you on the weekend if you have not fixed it.

[froop]

Originally Posted by Gumball

Happy to help you on the weekend if you have not fixed it.

Thanks Steve, I'll see if we're around your area on the weekend and give you a call to see if you're free.

Did you end up getting your trunk tank meth setup?

[Gumball]

Originally Posted by froop

Thanks Steve, I'll see if we're around your area on the weekend and give you a call to see if you're free.

Did you end up getting your trunk tank meth setup?

Thats fine, all the new bits are installed

[skidz]

i wonder what the odd are of a faulty jb4???

[froop]

Originally Posted by skidz

i wonder what the odd are of a faulty jb4???

Yeah I'm thinking the same thing but I reckon it's more likely the harness. Only way to know is to interchangeably swap in a working unit/harness with the ones I have

[bsm135]

Was the jb4 a g4 or a g5 board?

Was it an upgrade from a jb3?

I'm pretty sure I read somewhere that the harness needs to be modified if it is an upgrade. A couple of wires need to be swapped around if you are using the old harness.

Probably not the case, but just a thought.

[froop]

Originally Posted by pd135

Was the jb4 a g4 or a g5 board?

Was it an upgrade from a jb3?

I'm pretty sure I read somewhere that the harness needs to be modified if it is an upgrade. A couple of wires need to be swapped around if you are using the old harness.

Probably not the case, but just a thought.

It's a JB4 G5 ISO which would have been upgraded from a G4. It was working for the seller before it shipped so either it has broken in transit or we're doing something wrong lol

[Gumball]

Got a spare g4 we could try just to rule one part out...

[froop]

Originally Posted by Gumball

Got a spare g4 we could try just to rule one part out...

I'm an idiot. I got a spare G4 in the sale too lol. Didn't even think to try it

[skidz]

i got 20 that says the harness hasnt been upgraded