alex_00s

iTrader: (18)

Dear Subaru guru’s I need your help.

car: jdm Sti 2003

so the car was part stripped and hand brake removed and replaced with a hydraulic hand brake.

the hand brake light is constantly on which I understand opens the central diff.

I have located the hand brake wire which is the pink one that goes to the dccd controller behind the steering column.

that wire is a constant earth. I have tried putting an earth switch on it to mimic the hand brake switch, but on or off makes no diff the light stays on and diff open.

I’ve seen that the voltage changes from 0.4v to 8v when the hand brake is on/off which the dccd controller registers to open/close diff.

Might be worth mentioning I’ve also removed the abs.

how can I fix the dccd issue?

thank you

Don Clark

Assuming the 2003 JDM systems are the same as the UK MY04 versions there are 6 connections to the ABS system.

See attached PDF

alex_00s

iTrader: (18)

Thank you Don.

I will have a proper look through that as had suspected the break in abs link may have affected the dccd.

the trick will be to work out which wires to join to make the car think the abs is still there

alex_00s

iTrader: (18)

I’ve found the abs pin out on this site half way down the thread…

https://www.subaruforester.org/threa...for-abs.11414/

What to connect?
what to use a resistor on?

what to do to trick the car the abs is still there?

alex_00s

iTrader: (18)

It looks like the abs warning light is linked to the parking brake light.

if I can get the light out would that trigger the ecu to think the abs is there?

sounds a bit too simple, but if it does then would the earth switch I’ve put on the hand brake wire allow the dccd to work?

Don Clark

Different ABS systems were fitted at different times so you need to be sure you are looking at like for like. (UK market can be different to US; Forester may be different to Impreza)
As with previous info attached is the MY04 UK Impreza ABS diag info pinout

Don Clark

They are only linked in the fact they are both fed from the same ign source supply.

alex_00s

iTrader: (18)

I see ok sorry my sense of electricals is very poor.

I will do some more digging to find the right pin out for my cars abs.

but any others advice on which might be the wires to do something with will be appreciated

Don Clark

UK MY04 DCCD diag pin out

alex_00s

iTrader: (18)

thank you Don. I had that already and used it to identify 11 as the wire to connect a switch to to mimic the hand brake on/off.

But it appears I need to do something with the abs. Although not sure what exactly

alex_00s

iTrader: (18)

I wonder if I took the control unit out of the old abs pump and just connected that to the loom it would work?

threw my pump in the bin but could source one to try that maybe

alex_00s

iTrader: (18)

I think the only option is to install an after market dccd controller…

https://www.mapdccd.com

1509joe

iTrader: (2)

Correct you won't get the DCCD going on a newage without being connected to the ABS unit.
MAPDCCD is a very good unit and Matt is very helpful.

alex_00s

iTrader: (18)

yeah Matt is a top guy and recommended Simon at Chevron to instal.

spoke to Simon he’s proper clued up so have the mapdccd on order and booked in with Simon for end of June.

1509joe

iTrader: (2)

Glad you got sorted Simon's a good lad too

alex_00s

iTrader: (18)

So just a quick update, the mapdccd cost £360 plus £85 import etc.

I’m getting it delivered in a few days and then car will be with Simon at chevron end of June 👍

I’ll do another update once all is done ✅