Body Control Unit question - Page 2

stocktake · 7th November 2007, 22:28

Do you have one fitted? passengerside fusebox,

"the BCU provides an earth for the coil of the powerwash relay which energises and closes the relay contacts"

Sorry if i'm on the wrong track Paul, just trying to help.

JohnDotCom · 7th November 2007, 22:31

Quote:

pulling up on your stalk!!!!!!!!!

(can I say that on Here?)

Yea Its late and all the kiddies are in bed.

stocktake · 7th November 2007, 22:40

Quote:

Originally Posted by JohnDotCom

Yea Its late and all the kiddies are in bed.

Sorry JDC, you are mistaken, member 11 is still on line

Raistlin · 8th November 2007, 06:08

In which case I am again stuck as to why it isn't working.

Kiwirover · 8th November 2007, 06:31

Is it a hidden T4 thing?

Raistlin · 8th November 2007, 07:55

Quote:

Originally Posted by stocktake

Sorry if i'm on the wrong track Paul, just trying to help.

Not in the least - very useful information.

Raistlin · 8th November 2007, 07:58

Quote:

Originally Posted by Kiwirover

Is it a hidden T4 thing?

Keith thinks not

Greeners · 8th November 2007, 08:46

Paul

Just been looking at the wiring diagram, and I'm 99?% certain it's BCU related.

Before the power wash will work, the BCU needs to see that

a) There is enough washer fluid
b) The lights are ON

It will then switch the feed to the relay which will pass the feed to the PW pump.

The live feed to the pump should be 30 amp (fuse 44)

I think what may be missing is the link between the light switch and the BCU.

Any help ?

Raistlin · 8th November 2007, 11:50

Quote:

Originally Posted by Greeners

Paul

Just been looking at the wiring diagram, and I'm 99?% certain it's BCU related.

Before the power wash will work, the BCU needs to see that

a) There is enough washer fluid
b) The lights are ON

It will then switch the feed to the relay which will pass the feed to the PW pump.

The live feed to the pump should be 30 amp (fuse 44)

I think what may be missing is the link between the light switch and the BCU.

Any help ?

The washer bottle is full.

The BCU must know the lights are on I guess because the radio is getting its 'lights on' data.

The BCU must be aware of the lights condition I'd have thought because it initiates the warning when the lights are on, engine off, and you open the door.

David3807 · 8th November 2007, 12:19

Quote:

Originally Posted by Raistlin

The washer bottle is full.

But does the BCU know this ?? Presume the washer bottle has a level sensor somewhere - is it working or connected ??

Just a thought

7th November 2007, 22:28	#11
stocktake Vis Whiz Rover 75 2.5 auto Saloon Join Date: Jun 2007 Location: LEEDS Posts: 20,591 Thanks: 2,057 Thanked 3,056 Times in 1,621 Posts	powerwash relay Do you have one fitted? passengerside fusebox, "the BCU provides an earth for the coil of the powerwash relay which energises and closes the relay contacts" Sorry if i'm on the wrong track Paul, just trying to help. __________________ Dave... Lost a few stones and a Gall Bladder and part of a bile duct and all of my dignity in the suppository incident

8th November 2007, 06:31	#15
Kiwirover Loves to post 1999 75 Con SE 2.5 Auto Join Date: May 2007 Location: Lower Hutt Posts: 326 Thanks: 3 Thanked 2 Times in 2 Posts	Is it a hidden T4 thing? __________________ Regards, Gillian

8th November 2007, 08:46	#18
Greeners Moderator MG-ZTT Join Date: Mar 2007 Location: Ware, Herts Posts: 19,798 Thanks: 161 Thanked 1,249 Times in 1,036 Posts	Paul Just been looking at the wiring diagram, and I'm 99?% certain it's BCU related. Before the power wash will work, the BCU needs to see that a) There is enough washer fluid b) The lights are ON It will then switch the feed to the relay which will pass the feed to the PW pump. The live feed to the pump should be 30 amp (fuse 44) I think what may be missing is the link between the light switch and the BCU. Any help ? __________________ *David* Impecunity is the mother of ingenuity Useful how to's for common problems Car Of The Month Jan 2014 [SatNav Power Down] [Coolant Level] [SatNav Repair] [Diesel Non Starting] [Paint Codes] [Rear Light Seals] [Reversing Light Switch] [Bleeding Brakes][Sunroof Drain] [Early ZT's][Instrument Pack Diagnostics][ATC Diagnostics]

8th November 2007, 06:08	#14
Raistlin Banned 75 CDT Connoisseur SE Auto Join Date: Nov 2006 Location: Wolverhampton Posts: 8,450 Thanks: 0 Thanked 3 Times in 3 Posts	In which case I am again stuck as to why it isn't working.