[UFGator535]

UPDATE - GOT IT WORKING. The small black and small white oem subconnectors on my car were reversed. Hooked them up the other way and it worked.

I will leave everything in this post and thread in case anyone else runs into a similar confusion and needs help. Thanks to everyone who chipped in, much appreciated.

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** put this in email but forgot on here - installing in a 2008 535i **

Hey guys, I picked up a JB4 on there last week and finally got around to installing it today. I've done a bit of modding in the past and found it very easy to get to and install, followed the guide and triple checked everything, but am either missing something or not getting a good connection. My ecu is actually reversed from the pics (small is on the left, large on the right) and on the small side I have white and gray connectors rather than black and gray. Here is a diagram of how I hooked it up, and how the pnp guide shows.

After install the car tied to start but would not. I re-seated everything but still no luck. Pulled it out and hooked back up to stock and had no problem.

Any thoughts or ideas??

[themyst]

one of two things, you either have one or more of the subconnectors backwards or you didn't connect the power wire.

if the jb4 harness has black wires it goes in the larger subconnector, red wires in the small subconnector.

[FirstBMWLA]

I guess I'm confused but would like to help. So you're telling me your ECU connectors are in different places than normal?

[UFGator535]

Originally Posted by themyst

one of two things, you either have one or more of the subconnectors backwards or you didn't connect the power wire.

if the jb4 harness has black wires it goes in the larger subconnector, red wires in the small subconnector.

Power hooked up, and yes, black wires were to large side and red to smaller side.

Anyone know if it is safe to flip the subconnectors around to test and see if one was backwards? I did not want to do this without checking first. By flip around, I mean disconnect one set, turn one of them 180, and then reconnect. I connected them all with the large, thin open slot all on the same sides.

[UFGator535]

Originally Posted by FirstBMWLA

I guess I'm confused but would like to help. So you're telling me your ECU connectors are in different places than normal?

If the small connectors are supposed to be on the right and large on the left, then yes my car ecu is backwards!

[themyst]

Originally Posted by UFGator535

If the small connectors are supposed to be on the right and large on the left, then yes my car ecu is backwards!

the connectors shouldn't be forced in under any circumstance, they should just slide in easily. Also, the arrows on the subconnectors should not be on the same side when connected.

[UFGator535]

Originally Posted by themyst

the connectors shouldn't be forced in under any circumstance, they should just slide in easily. Also, the arrows on the subconnectors should not be on the same side when connected.

Slid right in, did not have to force a thing, and they were on opposite sides.

[themyst]

Subconnectors not snapped into the dme correctly? Picked the right pin to extract for the power wire?

[UFGator535]

Yep, pin 2 for power.

I'm going to pull back apart tomorrow if it's not raining and get some pics of the stock setup/layout to confirm colors of connectors.

Thanks for the help so far!

[FirstBMWLA]

Odd, pics may help. You installing this on a 535i? Could be why connectors are backwards possibly.

[UFGator535]

Originally Posted by FirstBMWLA

Odd, pics may help. You installing this on a 535i? Could be why connectors are backwards possibly.

Yes - 2008 535i. I did not see anything about the ecu being reversed of connectors a different color though.

[TLO03]

Ecu connector are the same.

[smokinHawk]

the car will start with the jb4 installed without the powerwire.
car will work fine without the power wire connected, but jb4 wont work.

[domrep]

if you're still having trouble, hopefulyl Mike will come in. He should be able to help.

[Mike@N54Tuning.com]

Email pics of your install

Email; mike @ n54tuning . com

Mike

[UFGator535]

Originally Posted by Mike@N54Tuning.com

Email pics of your install

Email; mike @ n54tuning . com

Mike

Will do. Either this evening or tomorrow I hope to have time to pull it back apart, get pics of the layout of the ecu and connectors, and then how I hooked up the JB4.

[UFGator535]

Got it working! Edited original post with details. Thanks everyone!

[drew4392]

Thanks for updating.

[N54bimmer]

Post a review asap

[UFGator535]

Originally Posted by N54bimmer

Post a review asap

Done