ABS Relay Mod

[fatnfast]

Having read a few methods of overcoming the issue of the ABS not 'starting' correctly due to battery voltage issues, rather than fit a switch or start putting relays into the fuse box and breaking into various parts of the loom, I did the following:

1. The idea is to delay the feed to the CPU that comes in on the green wire to pin 15.

2. Remove the multi connector on the CPU and find pin 15. Part way down the loom for this connector, make a small slit in the insulation. Locate the green 'pin 15' wire.

2. Cut the wire in two, and connect each end to a length of wire long enough to run to wherever you want to mount the 'new' relay. Mines on top of the airbox. Reseal the loom.

3. Connect the two wires to either side of the switch contacts on the relay.

4. On top of the airbox is the diagnostic plug. Find the blue wire and cut it leaving enough wire should you wish to reverse the mod later.

5. This blue wire comes from the alternator. Connect it to one side of the relay coil.

6. The other side of the relay coil needs to be earthed (any good point, battery etc).

Job done. On switch on, you will get just one ABS light showing. Start your engine. Once started, the output from the alternator builds up and closes the relay via the blue feed. Both light flash together as usual. This delay is long enough to ensure the CPU does not see a reduced voltage.

Pretty much any 12volt relay will do, I used the bog standard type used for spot lights etc. By using crimped male and female connectors the mod can be reversed in seconds. This is for a non servo abs 1150.

 

[Bumfluff]

Just did this the other day and was harder reading the instructions and working up the guts to cut the green wire than actually doing the mod

 

[fatnfast]

Yes, its a doddle. I cant understand why the USA guide does not use the feed to the diagnostic plug, which sits right next to the battery under the seat?

 

[Bumfluff]

true, was just as easy to use a scotch lock onto the blue wire off alternator though lol

 

[DrFarkoff]

Dear God Wash your mouth out with soap!!! Scotchlock the tools of the Devil i tell You!

I never liked messing with the Alternator tell tale so I go into the fuse box and tag into the Load relief relay So once you hit the starter the feed is gone and once you release the starter the circuit comes back on and you have "Self Check" with a running engine

true, was just as easy to use a scotch lock onto the blue wire off alternator though lol

 

[MattW]

So if I wanted a purely manual (no relay) solution, I could just find the pin15 green wire and insert a switch into it?

cheers
Matt

 

[CHANGELING]

So if I wanted a purely manual (no relay) solution, I could just find the pin15 green wire and insert a switch into it?

cheers
Matt

I like your way of thinking....

 

[MattW]

I like your way of thinking....

I think I read it from someone on here (possibly Jaythro).

I'd just like the ability to manually interrupt the power to the abs and force a re-initialisation on the rare occasions that it fails to start up properly. A little switch mounted somewhere on the dash seems a simpler solution than messing with relays etc (and my fuse box is full as I've got extra lighting and 'ignition on' auxiliary power relays in there ). It would also give you the option to kill the abs in a hurry if you needed to (not that I suddenly cross deserts very often).

 

[fatnfast]

A switch would work just fine.

My relay is mounted using velcro on top of the airbox, there is no need to dive into the fuse box at all. It is just as easy as putting a switch in and has worked fine for the past few thousand miles.

As for scotchlocks

 

[pegs]

is 1100 the same ?

 

[motobiker]

In my experience abs start-up faults are an early sign that all is not well with the battery.

When I last had a phase of these faults it was easily sorted.. just ride to the nearest main junction. and retry.. that short run was enough... eventually though.. after a couple of months it no longer was 'enough' and so I bought a new battery.

I'd rather not subvert this 'tell-tale'.

bit different for us 1100 owners.. with nothing that drains the battery like an alarm or 'always on' lights. I realise this.

 

[fatnfast]

Pegs, yes you can do the same mod but you will need to take your relay feed from the alternator (or just put a switch in) as you will not have a feed in your diagnostic plug.

This mod is purley to overcome an ABS fault on start up, and only after you are certain the battery and starter motor, plus any relevent electrical connections are all good.

As Motobiker states, this problem can be down to a dying battery.

In my case, I had fitted a new oem gel battery when the original wet lead acid battery finally gave up the ghost. The gel battery virtually elminated all start up ABS faults, but they still occured every now and again. I went as far as fitting a second new gel battery which still did not totaly cure the ABS fault (after having stripped and cleaned the starter, and having tried another new starter). I even ran in extra earth feeds. The problem persisted.

My own thoughts are: The gel batteries dont have as much cranking capacity as the old lead acid wet and/or the switch from 10w40 to 20w50 places additional 'strain' on the system and/or over time/heat cycles, corrosion and component tollerance creep has affected the sensed voltage.

I suspect, despite what others might say, an Odysey battery with its higher cranking current would proberbly solve it once and for all, but a relay is a lot cheaper..

 

[DrFarkoff]

Switch and relay offer the opportunity to switch off ABS on the move!

My 1100 hybrid had it cos I had a mishap on a muddy lane and couldn't get stopped until I used kill switch and in gear!!!

Switch was fitted that afternoon in a prominent position so that I could push it to turn frickin ABS off QUICKLY

 

[Bumfluff]

Dear God Wash your mouth out with soap!!! Scotchlock the tools of the Devil i tell You!

I never liked messing with the Alternator tell tale so I go into the fuse box and tag into the Load relief relay So once you hit the starter the feed is gone and once you release the starter the circuit comes back on and you have "Self Check" with a running engine

HAHAHA I know I hate them as well, I just had the odd one left in the tool box and it was quick and painless. All taped up with malgy tape to keep the water out though so will be ok.