[colwill116]

Hi all,

Before you say "this forum has a search function" there are two issues to that.

A) JB4 is only 3 characters so very difficult to search for
B) it seems the kit I have acquired Is the latest batch so doesn't match any instructions or guides I've seen.

Anyway everything seems very straight forward but I have 2 questions:

First one EWG harness, is this picture the correct harness? It's dark but I am sure that's it

Second question and one that I really need to rack everyone's brain with. The OBD connector is different so I don't think I can splice it. Is it possible to connect this one straight to the OBD port or do I need to cut some wires and splice it somewhere? If so where so that I can keep the canbus functions

Your advice would be appreciated, ideally I would like to plug it straight into the OBD port. Cleanest method

Cheers

 

[colwill116]

Would also like to thank sustanon250 for the kit and being very easy to sort this all out with

 

[Sustanon250]

Would also like to thank sustanon250 for the kit and being very easy to sort this all out with

Cheers mate , great to meet you !

Can't believe you're fitting it tonight - you nutter !!!!

 

[colwill116]

I'm not fitting it tonight don't worry. Just getting all the facts straight before jumping into it

 

[colwill116]

Bump... Just want some advice before I start

 

[Sustanon250]

Bump... Just want some advice before I start

Where's Blind Pugh when you need him

 

[colwill116]

Bump... Just want some advice before I start

Where's Blind Pugh when you need him

Where's anyone when you need them?

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[cpcrampton]

You are correct mate....

The first picture shows where you need to plug in your EWG harness.
Yes no splicing or cutting required with the OBDii plug. you need to remove the platic panel from under the steering wheel and then the kick panel to access the OBDii plug.

Easy

 

[Blind Pugh]

Bump... Just want some advice before I start

Where's Blind Pugh when you need him

Sorry folks been coaching u10s mini rugby.

Ref the 2nd question, with RHD car, I wouldn't bother with OBD2 cable (its designed for LHD US cars where OBD2 port is mounted in a different place) as on RHD cars the OBD2 is located vertically in the kick panel by the door jamb. The door wont close with this cable plugged into your OBD2 port.

Solution is to install your canbus cables thru the bulkhead [via grommet where bonnet pull cables pass thru] and positap as follows

CANBUS Back of OBD2 Port

Green Grey

Brown Blue

Then upload OBD FW onto JB4 and then you have full functionality for gauge hijacking, map switching and canflap exhaust control as per BMS's YT video below :-

BP

 

[colwill116]

Thanks for the info. The only issue is the OBD harness and the two cables attached to the JB4 both have harnesses so there is no postitaps in my kit.

Recommend just cutting the OBD harness off the end?

I'm sure I'll work something out though.

Cheers

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[3xxie]

I did this recently. As BP said, the OBD connector is no good for our cars. Just snip the end off and tap the two wires as per BP's colour pairings.

I managed to find some Positaps locally, otherwise there's always eBay. Make sure you get ones with a sharp tapping pin - I bought the gold-plated variety and they weren't sharp enough to get through the insulation so I had to butcher it first.

 

[colwill116]

I did this recently. As BP said, the OBD connector is no good for our cars. Just snip the end off and tap the two wires as per BP's colour pairings.

I managed to find some Positaps locally, otherwise there's always eBay. Make sure you get ones with a sharp tapping pin - I bought the gold-plated variety and they weren't sharp enough to get through the insulation so I had to butcher it first.

Did you snip the end of the OBD harness or the harness that's attached to the JB4?

Also wanted to install this tonight and I don't have any positaps

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[jonnydrama]

Can you not dislodge the OBD connector to use the OBD adapter then tie it up behind the trim until service time? That'd be my preference if possible as the wiring doesn't look pretty when the posi taps are removed.

 

[Blind Pugh]

Jonny - you can use JB4 absolute maps [0, 4, 6 and 7] without OBD connected but then JB4 adaptive maps [1, 2, 3 and 5] won't work as they rely on DME info via canbus. In addition you won't have ability to swap maps nor read and clear codes on the hoof if canbus is disconnected. BP

 

[Blind Pugh]

I did this recently. As BP said, the OBD connector is no good for our cars. Just snip the end off and tap the two wires as per BP's colour pairings.

I managed to find some Positaps locally, otherwise there's always eBay. Make sure you get ones with a sharp tapping pin - I bought the gold-plated variety and they weren't sharp enough to get through the insulation so I had to butcher it first.

Did you snip the end of the OBD harness or the harness that's attached to the JB4?

Also wanted to install this tonight and I don't have any positaps

Cut the OBD plug off and mate the wires under the bonnet between OBD2 and JB4 using existing BMS 2 pin plugs to make canbus disconnection under the bonnet easier.

If no positaps you can always use Sealey or similar T taps instead.

 

[colwill116]

I did this recently. As BP said, the OBD connector is no good for our cars. Just snip the end off and tap the two wires as per BP's colour pairings.

I managed to find some Positaps locally, otherwise there's always eBay. Make sure you get ones with a sharp tapping pin - I bought the gold-plated variety and they weren't sharp enough to get through the insulation so I had to butcher it first.

Did you snip the end of the OBD harness or the harness that's attached to the JB4?

Also wanted to install this tonight and I don't have any positaps

Cut the OBD plug off and mate the wires under the bonnet between OBD2 and JB4 using existing BMS 2 pin plugs to make canbus disconnection under the bonnet easier.

If no positaps you can always use Sealey or similar T taps instead.

Okay will do. Now that's cleared up all seems easy.

Cheers do all your help.

Keep an eye out around half 6-7 for any help me threads

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[jonnydrama]

Jonny - you can use JB4 absolute maps [0, 4, 6 and 7] without OBD connected but then JB4 adaptive maps [1, 2, 3 and 5] won't work as they rely on DME info via canbus. In addition you won't have ability to swap maps nor read and clear codes on the hoof if canbus is disconnected. BP

Hi mate, wasn't really meaning that. What I meant was is it possible to have the adapter plugged into the OBD port, but have it all hidden behind the trim? I.e unmount the OBD port from the trim. Then when it comes to service time disconnect the adapter and remount the OBD port?

 

[Blind Pugh]

Jonny - my bad. If you are trying to be discrete, displacing OBD port sounds like a phaff.

 

[jonnydrama]

Might give it a try before posi tapping wires. Definately agree that doing it inside is the most discreet way though.

 

[3xxie]

Jonny - you can use JB4 absolute maps [0, 4, 6 and 7] without OBD connected but then JB4 adaptive maps [1, 2, 3 and 5] won't work as they rely on DME info via canbus. In addition you won't have ability to swap maps nor read and clear codes on the hoof if canbus is disconnected. BP

Hi mate, wasn't really meaning that. What I meant was is it possible to have the adapter plugged into the OBD port, but have it all hidden behind the trim? I.e unmount the OBD port from the trim. Then when it comes to service time disconnect the adapter and remount the OBD port?

Yes, you can do this. There's plenty of space behind the trim to tuck it away, but you will obviously lose easy access to your OBD port for other things.