Getting powerwash to work

steve1975 · 2nd November 2017, 12:22

Iv just fitted xenon head lights to my car,all of the wiring for them were already there built into the loom so thankfully plug n play,I fitted the headlight pump and all the plumbing for the light washers but they don't seem to work,do I need anything else for them to squirt on the lights as I'm at a loss now.
Regards.

suzublu · 2nd November 2017, 12:30

You also need a bbus & T4 session

oh, & I think they only work every 5 wash/wipes

clf · 2nd November 2017, 12:38

Quote:

Originally Posted by suzublu

You also need a bbus & T4 session

oh, & I think they only work every 5 wash/wipes

And headlights switched on too Lol

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steve1975 · 2nd November 2017, 14:06

Quote:

Originally Posted by suzublu

You also need a bbus & T4 session

oh, & I think they only work every 5 wash/wipes

What's a bbus?
Sorry to sound thick but never heard of it

wutang · 2nd November 2017, 14:51

Quote:

Originally Posted by steve1975

What's a bbus?
Sorry to sound thick but never heard of it

Battery Backup sounder for the alarm, the power wash shares a relay or something. I was going to fit power wash at one point so have all the bits in a box somewhere with a BBUS in it.

suzublu · 2nd November 2017, 14:55

If you look under the n/s scuttle cover, it should be there, looks like a horn with BMW written on

stevestrat · 2nd November 2017, 14:57

A BBUS is a battery back up sounder. It replaces the standard alarm horn in the passenger side plenum.

It needs a T4 session to tell the car it has powerwashers fitted as a relay has to "be advised" of its change of function. The relay in question operates either the standard alarm horn or the powerwashers.

There is another method to get the powerwashers working involving two relays and doesn't need a BBUS. Only difference is it works every time with the screenwash when the lights are on instead of 1 in 5. I used it on a 1.8T when I couldn't get them to work even with a BBUS and T4.

steve1975 · 2nd November 2017, 15:14

Quote:

Originally Posted by suzublu

If you look under the n/s scuttle cover, it should be there, looks like a horn with BMW written on

So I need to get it off the car I got the lights/washers from? Does it just plug in?

stevestrat · 2nd November 2017, 15:31

You need to get a BBUS, remove the standard alarm horn under the pass side plenum cover and fit the BBUS, connector should be there. Do not fit the BBUS without the T4 alteration otherwise the BBUS will go off, they are incredibly loud and because they have an internal battery will not stop. I'm speaking from experience

2nd November 2017, 12:22	#1
steve1975 Banned rover 75 saloon Join Date: Oct 2015 Location: workington Posts: 1,890 Thanks: 385 Thanked 449 Times in 279 Posts	Getting powerwash to work Iv just fitted xenon head lights to my car,all of the wiring for them were already there built into the loom so thankfully plug n play,I fitted the headlight pump and all the plumbing for the light washers but they don't seem to work,do I need anything else for them to squirt on the lights as I'm at a loss now. Regards.

2nd November 2017, 14:57	#7
stevestrat This is my second home ZT260 #243 (resting) Join Date: May 2010 Location: Prestonpans Posts: 22,481 Thanks: 650 Thanked 4,624 Times in 3,358 Posts	A BBUS is a battery back up sounder. It replaces the standard alarm horn in the passenger side plenum. It needs a T4 session to tell the car it has powerwashers fitted as a relay has to "be advised" of its change of function. The relay in question operates either the standard alarm horn or the powerwashers. There is another method to get the powerwashers working involving two relays and doesn't need a BBUS. Only difference is it works every time with the screenwash when the lights are on instead of 1 in 5. I used it on a 1.8T when I couldn't get them to work even with a BBUS and T4. __________________ Steve T4 Location Map Last edited by stevestrat; 2nd November 2017 at 15:07..

2nd November 2017, 15:31	#9
stevestrat This is my second home ZT260 #243 (resting) Join Date: May 2010 Location: Prestonpans Posts: 22,481 Thanks: 650 Thanked 4,624 Times in 3,358 Posts	You need to get a BBUS, remove the standard alarm horn under the pass side plenum cover and fit the BBUS, connector should be there. Do not fit the BBUS without the T4 alteration otherwise the BBUS will go off, they are incredibly loud and because they have an internal battery will not stop. I'm speaking from experience __________________ Steve T4 Location Map

2nd November 2017, 12:30	#2
suzublu This is my second home rover 75 1.8 vvc club se wedgwood blue Join Date: Aug 2009 Location: Seaton Carew Posts: 26,920 Thanks: 65 Thanked 7,142 Times in 4,642 Posts	You also need a bbus & T4 session oh, & I think they only work every 5 wash/wipes

2nd November 2017, 14:55	#6
suzublu This is my second home rover 75 1.8 vvc club se wedgwood blue Join Date: Aug 2009 Location: Seaton Carew Posts: 26,920 Thanks: 65 Thanked 7,142 Times in 4,642 Posts	If you look under the n/s scuttle cover, it should be there, looks like a horn with BMW written on