Help... Are JBB's interchangeable?

[SilverSlug]

My OBD port, along with the cluster, iDrive screen, wipers, doorlock button... are not working (after I was messing with the wires running to/from the junction box). E93 2011 M3.

Since the headlights/windows work, the car starts and drives, I'm suspecting the JBB or the ECU is the culprit.

I got a JBB on eBay (exact matching numbers), but is used, so not 100% certain that it isn't also fried.

FCP Euro is showing this one fits, but the part number is different: https://www.fcpeuro.com/products/bmw...0aAhpUEALw_wcB

Are JBB's snd ECU's interchangeable from different years?

[SilverSlug]

Although if it was the ECU... The car wouldn't start, right?

[Makaveli7]

odd question: did this happen when it rained or washed the car?

We had a similar e93 m3 2009 with the exact same issue (cluster, iDrive screen, wipers, doorlock button... are not working) and it was the water drainage plug in the roof clogged and running water on the IBS and airbag module in the back. Tried different JBBEs and fuse box cleaning and ended up changing the IBS cable, FRm and coding of CAS. Hope its not that kind of mystery issue.

With that said did you code the JBBE as they need to be programmed to the car (if it didnt come from an E93 with the same options).

For compatibility check, see the realoem list to ensure that the old/updated part number of the JBBE you have.

https://www.realoem.com/bmw/enUS/par...&q=61359364819

[SilverSlug]

Thanks a lot for that info.

Yes, I tried coding the JBB using BMW Standard Tools, and even though got Cable Detected and Ignition On... It couldn't fully connect, and received "No Response from Control Unit" when trying to read the Error Memory.

OBD port also doesn't work (error message), so can't read codes.

Indeed it has been raining here... Could it have happened if I opened the trunk, which ended up pouring/flooding some water where it shouldn't have??

(I didn't see any water at all on the IBS).

[SilverSlug]

The other JBB, ECU and IBS issues I've read/heard about, the car wouldn't start, but mine starts and drives. Did yours?

Also, FRM is mostly for exterior lights, ya? (My headlights work, hazard lights too). Did yours?

Do you remember which exact component is the one that ended up resolving the issue?

I really hope it's not a big mystery fault too, but it's looking like it might be...

[irokwrx]

I had similar issues, My issue was the FWM. It had gotten wet somehow. Windows, locks, and some light were "No Go" the car did start and drive just fine. I sent it(FWM) to Alex and he fixed it. It was not that expensive. Not sure if this helps.

[SilverSlug]

Wow. I hope that's it. Although my windows, mirrors, all interior lights and headlights work.

Are FWM and FRM the same thing? (Footwell Module?)

Also, was your OBD Port working at the time?

Did you have to code the module when you got it back?

Could you send over Alex's contact info??

[SAMM3Y]

Didn't this happen after you installed a lecy steering wheel? Have you tried unplugging it and seeing if OBD port starts working or putting the steering wheel into "service mode"
Obd won't work with a can bus interface "on" in the car.

[SilverSlug]

Yes, I thought this started when I installed a Genuine BMW Head-Up Display, and to be more specific, I think it might have started when I disconnected the battery... but, have since completely removed it in hopes of diagnosing the issue.

Can a faulty Footwell module cause interference on the canbus?

If I just replace the footwell module, can I code it using BMW Standard Tools?

[irokwrx]

Originally Posted by SilverSlug

Yes, I thought this started when I installed a Genuine BMW Head-Up Display, and to be more specific, I think it might have started when I disconnected the battery... but, have since completely removed it in hopes of diagnosing the issue.

Can a faulty Footwell module cause interference on the canbus?

If I just replace the footwell module, can I code it using BMW Standard Tools?

I just installed a Wengineering display and I had to tap into the canbus high and low (I think one was red and the other was red and blue) the first two pins on the first the connector housing of the black connector. I say this because the display has a setting that needs to be turned off in order for the OBD to work. In my case, it's called a service mode. It has to be turned off in order for the OBD to work.
Programs such as EDIABAS, ISTA,
INPA report an error while establishing a connection.

[SilverSlug]

Interesting. When I installed the Head-Up Display, the instructions called for tapping into the first two wires of the blue connecter into the JBB (not the black one).

Indeed I am getting an error when attempting to connect with INPA, although I've completely removed the Head Up Display from the wiring, put everything back to stock, and still getting the same issue.

[SilverSlug]

Is it possible to test the IBS and/or wires?

Would it be just a continuity test with a multi-meter?

[irokwrx]

Originally Posted by SilverSlug

Interesting. When I installed the Head-Up Display, the instructions called for tapping into the first two wires of the blue connecter into the JBB (not the black one).

Indeed I am getting an error when attempting to connect with INPA, although I've completely removed the Head Up Display from the wiring, put everything back to stock, and still getting the same issue.

That's correct the first two wires. It's been a min since I did it. I got power from the other plug.
Does whatever you are hooking up have a "Service Mode"?

[SilverSlug]

Are you certain it was the first two wires in the black connector (on the right), not the blue connector (on the left)?

The head-up display might have a service mode, but if it does, I can't access it since the iDrive, Cluster, etc. are not working... I've also unplugged everything completely and put back to stock while diagnosing this issue.

[SilverSlug]

I recall this issue starting before I even plugged the head-up display into any wires. I think I made the mistake of beginning to unplug the JBB before the battery was disconnected, and chalked this issue up to the thought that it was happening because the JBB was disconnected. I discoed the batter soon after that, thinking it would all go back to normal after everything was hooked up.

What could have possible fried or what errors could have occurred by disconnecting the JBB while the battery was still connected (like a complete idiot).

[SAMM3Y]

Checked all the fuses?

[SilverSlug]

Checked all of the fuses multiple times with a voltage tester, as well as pulled every single fuse and checked for continuity with a multi-meter.

Today, when I try to start the car... It just cranks and cranks, engine NO LONGER STARTS

[irokwrx]

Originally Posted by SilverSlug

Are you certain it was the first two wires in the black connector (on the right), not the blue connector (on the left)?

The head-up display might have a service mode, but if it does, I can't access it since the iDrive, Cluster, etc. are not working... I've also unplugged everything completely and put back to stock while diagnosing this issue.

I found my instructions here is a photo from that step.
If sitting in the passenger seat this is the plug to the left (towards the driver).

[SilverSlug]

Yes, exactly. The blue connector on the left. This is where I tapped into the canbus too. I'm glad at least that is the same/correct. I've put everything back now to try to diagnose this issue.

Where did you tap into power and ground?

[SilverSlug]

I tapped into power at the red wire w/ brown stripe (pin 13) at the harness which plugs into the JBB... Which in hindsight is the stupidest thing ever.

I followed those dumbass install instructions on YouTube without thinking.

I should have just used a fuse tap and tapped into one of the empty fuse slots in my fuse box, and ground to the screw in the glove box (both just like my dash cam).

[SilverSlug]

I think maybe the wire tap I used severed the power to the JBB?

I pulled off the wire tap and noticed the wire is kinked fairly hard, but looks like the wires inside may still be intact?

Could a partially severed power wire cause issues like this?

Wouldn't the car not start if that was be case though?

[Makaveli7]

the 2 wires you tapped into doesn't match the colour of Can lines (a blue/Red and a Red wire) i think the its the power lines in the pic. Get them straightened up and check if it works than you caught ur culprit.

Since the car is not starting now im suspecting something with the IBS/CAS.

Did the engine stop working after getting more rain? This is starting to sound more and more like the issue we had on the e93. Car used to drive with headlights and signals working (AC, idrive, door locks doesnt work), sometimes car doesnt even turn on.

Steps we took that might help.

1- Removed the fuse box completely and cleaned with Electro Flush.
Car started with no issues - Problem came back after car wash.
2- Changed IBS cable and airbag module in the back (there was evidence of water) and cleaned the drainage lines (one was kinked in the back right side).
3- Reprogrammed the CAS and FRM (same as FWM) as programming was gone on both.

Before starting to dig into the issue, we used to leave the car to completely dry in the sun and it used to work after that if u want to try that as well.