Reverse light misery.
- Thread starter k3ogh
- Start date
Standard VW fuse block, normally housed in another plastic carrier along front of seatbase: That fuse will, most likely, be for 12V sockets (some or all).
We would definitely look at this for you. However we are on an annual break at the moment, when is your mot book ?
Ideally you need someone with vcds (vagcom) to check the Transmission control unit is seeing reverse, when selecting reverse.
I suspect you'd get warning lights relating to a gearbox issue if it isn't..
Then check in the body control module -09- to see if that is getting a reverse signal to activate the feed to the reverse lights.
If it is, and it thinks it should be sending the voltage to the reverse lights.. then it needs checking at the connection coming out of the body control unit to actual make sure a voltage is being sent out.
If there is no voltage coming out of the body control unit, then there is something wrong with the body control unit (as long as earths / feeds are ok to the body control unit)
If there is a voltage coming out of the body control unit, and it's showing that it sees its in reverse.. then the wiring to the rear wants checking.
The clue to finding the fault is realistically based on whether 09 sees reverse or not.
I suspect you'd get warning lights relating to a gearbox issue if it isn't..
Then check in the body control module -09- to see if that is getting a reverse signal to activate the feed to the reverse lights.
If it is, and it thinks it should be sending the voltage to the reverse lights.. then it needs checking at the connection coming out of the body control unit to actual make sure a voltage is being sent out.
If there is no voltage coming out of the body control unit, then there is something wrong with the body control unit (as long as earths / feeds are ok to the body control unit)
If there is a voltage coming out of the body control unit, and it's showing that it sees its in reverse.. then the wiring to the rear wants checking.
The clue to finding the fault is realistically based on whether 09 sees reverse or not.
From Module
As Phil says from module 09 blockmap on my van NOT in reverse. I would expect that to show active when in reverse...
We are back now..
Im thinking of buying this package.
Dont think i have much choice than to try and work it out myself as the van now has no MOT @Absolut5.
Ross-Tech VCDS HEX-V2 USB package for VW, Audi, Seat, Skoda cars (1996 on, 3 VIN limit)
Ross-Tech VCDS HEX-V2 USB package for VW, Audi, Seat, Skoda cars (1996 on, 3 VIN limit) - only £225.00 including VAT & UK delivery!
m.gendan.co.uk
Dont think i have much choice than to try and work it out myself as the van now has no MOT @Absolut5.
Im thinking of buying this package.
Ross-Tech VCDS HEX-V2 USB package for VW, Audi, Seat, Skoda cars (1996 on, 3 VIN limit)
Ross-Tech VCDS HEX-V2 USB package for VW, Audi, Seat, Skoda cars (1996 on, 3 VIN limit) - only £225.00 including VAT & UK delivery!m.gendan.co.uk
Dont think i have much choice than to try and work it out myself as the van now has no MOT @
[QUOTE="k3ogh, post: 810518, member: 52533"]
Im thinking of buying this package.
[URL unfurl="true"]https://m.gendan.co.uk/product_VCV23_16.html#product_information.[/URL]
Dont think i have much choice than to try and work it out myself as the van now has no MOT [USER=78]@Absolut5
If it helps let’s book it in for a hour, I think we can come up with a conclusion on what’s up .. plus we will run a full vehicle diagnostics[/USER]
[/QUOTE]
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You can if its booked into a MOT station for a repair/test.I cant move the vehicle with no MOT, absolute nightmare
Where do i run that specific test within VCDS I've just recieved my cable, many thanks
Do this for when in and the out of reverse.
[VCDS]
[Applications]
[Controller Channel Map]
- Controller Address = 09
- Login or security code: Leave blank
- Function: Measuring values
- Output: CSV file
[Go]
The result CSV-file is saved into dircetory C:\Ross-Tech\VCDS\Logs
Seach in the blockmap files for the line where it shows the reverse switch active/not active
[VCDS]
[Applications]
[Controller Channel Map]
- Controller Address = 09
- Login or security code: Leave blank
- Function: Measuring values
- Output: CSV file
[Go]
The result CSV-file is saved into dircetory C:\Ross-Tech\VCDS\Logs
Seach in the blockmap files for the line where it shows the reverse switch active/not active
I fear this confirms no signal from the BCU?
It doesn't confirm zero output from the BCM, at least not until you have checked voltage coming out on the specific pin no. for reverse..
Can you send me your chassis no over pm, and ill look up what wire you need to be checking.
You can do this with a multimeter.
That will let you know where to go next - continuity / resistance checks.
Can you send me your chassis no over pm, and ill look up what wire you need to be checking.
You can do this with a multimeter.
That will let you know where to go next - continuity / resistance checks.
I did have a go at the plugs under the front passenger seat with a multimeter and got no readings
the green with black trace wire i concentrated on.
Now that you have VCDS you could also eliminate the Trailer module as causing the issue - if it thinks there is no trailer connected then at least you can eliminate that.
As also suggested by others I would check the continuity (with a multimeter) between on the green/black trace wire between the light and connector under the seat and also between the connector under the seat and the BCM (J119) module.
As also suggested by others I would check the continuity (with a multimeter) between on the green/black trace wire between the light and connector under the seat and also between the connector under the seat and the BCM (J119) module.
