Onboard Voltage Supply Unit J519 |
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T5 TDI
Vanorak Joined: 05 Nov 05 Status: Offline Points: 3687 |
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Posted: 22 Oct 16 at 20:42 |
The Onboard Voltage
Control unit (J519) lives behind the dash on the drivers side roughly above the
drivers right foot. It supplies voltage to many things
including:
Wipers
Horn
Cruise control
Alternator load management
Heated rear window
Indicators
Mirror heating
Interior lights
Reverse light
Hazard lights
Screenwashers
Bonnet switch
Door switch position recognition
Tow bar
Failed wipers are quite a common fault that can be caused by
the J519 but not necessarily the only one!
The bad news is the VW retail price is £380 + VAT. Second
hand units go on ebay for around £100 but there is no guarantee that they will
work fully. The suddenly failing wipers is just one common fault you could
inherit.
Refurbed units are offered for £195 + VAT by http://hazzydayz.com (who are very helpful on the phone.) They will
fit Cruise control for around £250 + VAT if you already have a J519 that supports it,
otherwise it’s £450 + VAT complete with a refurbed J519.
It’s important to get the correct part number for your
van, the part number should be on a label on the unit or can be found via
diagnostics. You may need a new J519 if you are adding cruise control or want to in the future. Some
J519’s already support cruise control. There is a good description of which
part numbers you can use on the ross-tech (VCDS manufacturer’s) site here http://wiki.ross-tech.com/wiki/index.php/Cruise_Control_Retrofitting_(7H)
If you buy a new or second hand J519 it will need coding. A
dealer or anyone with VCDS can do this. If it will still communicate, get the
coding from the old unit via diagnostics. It’s easier if
you already have the correct coding ready for the new unit.
On the facelift vans (2010 on) the J519 is combined with the
comfort module which used to be under the driver's seat to become the body control module
(BCM).
If you have any problems with wipers, horn, indicators etc
start by checking all fuses before buying anything. Sometimes systems have more
than one fuse so check every one with a meter or test lamp. There is a second
fuse box under the bonnet down beside the battery.
A failing J519 can produce it's own fault code or can cause other fault codes on the electrical system depending on the type of failure. Edited by T5 TDI - 27 Sep 19 at 16:16 |
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2004 2.5 174
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gregozedobe
Vanorak Joined: 22 Dec 06 Location: Canberra, Oz Status: Offline Points: -998266 |
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Thanks for the useful info
(but if I'm being brutally honest I must say I hope never to need to know it )
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T5 TDI
Vanorak Joined: 05 Nov 05 Status: Offline Points: 3687 |
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I don't suppose anyone else will have the odd load management fault I had but hopefully it will help someone who gets a fault with one of the other things in the list that doesn't respond to the usual checks.
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2004 2.5 174
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Thunnisett
Newbie Joined: 15 Aug 17 Location: Hastings Status: Offline Points: 1 |
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Hi. I am a noob to VCDS.
I am changing my J519 and not sure how to get the code ready to enter in the new unit. Any advice appreciated in where to extract the data. I went into the coding section and see the following: Software coding: (0-32767) 00001 Workshop code: (0-99999) 63351 Is this the correct section? |
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T5 TDI
Vanorak Joined: 05 Nov 05 Status: Offline Points: 3687 |
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It's important to give the details of your van. Since you have a J519 I'm assuming you have the old model. You need to select '09 Cent Elec' then 'Coding'. You should code the new unit to be the same as the coding on your old one. If you don't have the old code (and
assuming your VCDS is genuine) Ross tech support will help if you get really stuck. 00001 sounds unlikely to me for a cent elec coding but I can't tell where you are looking on VCDS. Can you post a full scan?
Ignore the workshop code unless you have a problem. Here is my coding for the Cent Elec although I did de-select the load management function which changes my coding slightly. If you add up the options your van has you should arrive at the correct code.
Address 09: Cent. Elect. Labels: 7H0-937-049.lbl Control Module Part Number: 7H0 937 049 K Component and/or Version: BORDNETZ SGVER 1.0 1901 Software Coding: 0000583 Work Shop Code: WSC 02756 785 00200 VCID: 3A7FC64E76101491EC-513C Edited by T5 TDI - 19 Aug 17 at 00:15 |
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