abs sensor wiring

[the parrot]

morning guys.

the wiring into my abs senor on the left side broke and i got a new block from vw. the question i have is what number on the block goes to what color on the car as i dont have a wiring diagram or does it matter in this case as its a pulse sensor.

 

[Muttley]

Not sure what you mean by a "block" in this context, but each sensor has two wires, one black and the other green or brown: the wiring harness on the car will have the same colours, so just match black to black and green to green or brown to brown. Polarity does matter.

 

[the parrot]

na. you see when you buy a oe block connector it dosnt come pre wired so the just to yellows into it which is a slight pain. im going to refrain myself from replaying to the color wire bit.
and i have do know polarity does matter. but what i wonder is it to separate pulse signals for the epc and the abs or a shared signal which would indicate the need for them to be wired correctly.
and as this is a pick up alot of the time it will not matter which way the wire is connected as it will still send a pulse no mater what polarity it is wired up. but i do not know the answer just like yourself. this is why i asked.

 

[Muttley]

I still don't know what you mean by a block connector. Where does this block connector fit in terms of the wiring between the wheel speed sensor and the ABS computer? And what does it connect to what?

The wheel speed sensor is a small magnet with a coil of wire wrapped round it, and small electrical pulses are produced in the coil by the teeth of the ring attached to the hub as they go past. Getting the wires the wrong way round will reverse the polarity of the pulses. This may not matter, but I wouldn't like to bet on it. And it's easy to match up the wires for colour.

Unless you are talking about something else in the ABS system, but I can't imagine what.

You mention EPC and ABS. The only use of the acronym EPC I know of in the context of the Seat Leon is Electronic Power Control i.e. the fly-by-wire throttle, which is not connected to the wheel speed sensors at all.

The speed sensors are connected directly to the ABS control unit under the bonnet, and the ABS computer does all the calculations and the activation of the ABS pumps for ABS, EDL, TCS and ESP functions. It can send a signal to the ECU asking for power reduction should that be needed for TCS or ESP functions - but EDL and ABS are performed by modulating brake pressure only.

 

[the parrot]

abs sensor has a connector plug that goes onto it.
sorry confusion in terminology. if you couldn't figure that out. the problem i have is the repair kit doesn't come with wires attached for vag. and the service department just fitted 2 yellow wire out of it this is my problem you see. anyway doesn't matter. as you have been more than useless with your help.
thank you

 

[Muttley]

"anyway doesn't matter. as you have been more than useless with your help"

Well, I didn't expect abuse for trying to help you. Since I can't understand the way you are describing your problem it is quite difficult for me to give you any help.

So I have had to do your homework for you:
1) The sensors terminate in an electrical connector socket, and there is a plug on the car loom to connect to it.
2) I think you want to know which colour wire to attach to pin 1 and which to pin 2 of the plug.
3) The sensor polarity *is* important, the wiring diagrams are very clear to designate + and - connections.
4) As I said above, the sensors are connected directly to the ABS computer, which is expecting to see pulses of a certain shape and polarity.

I am still having to guess, but from your bad-temepered posts I think that what you are calling a block is this very plug. I would describe it as the plug that connects to the sensor socket - something that you only alluded to in your last post (I was going to say "made clear", but none of your posts is clear).

You also talk of a repair kit, for the first time, in your last post. What else is in this kit?

It "doesn't come with wires attached for vag." What does this mean?

"the service department just fitted 2 yellow wire out of it this is my problem you see." So you have a Service Department doing this work for you? Why not ask them...

I'm still curious to know what EPC has to do with all this.

Now that I have identified the item that you are calling a block, I can find the right part of the wiring diagram that has the connector numbers.

By the way, it would also help everyone else to understand what you are typing if you used conventional English, with punctuation, capital letters in the right places, proper sentence construction and correct spelling. I'm sure you have access to apps for spell checking and grammar advice.

 

[the parrot]

Sorry about the punctuation. While working im doing 3 things at once. And sometimes speed type. Unfortunately I miss connecting words if im really busy.

No the service department just added the 2 wires as a favour. This kind of work is child's play wouldn't take it to a shop for that but due to not having a wiring diagram I thought id look for advice here.
The wires coming out of the abs plug that terminates at the sensors is were my problem is. I'll just have to go through the system and work it out the old fashioned way I guess.
Thanks.

 

[Muttley]

All the diagrams I can find show pin 2 as +ve and connected to the black wire, pin 1 a -ve and connected to the green or brown wire.

 

[the parrot]

i got this sorted last night. traced the wires back. and were good. i have traction control and abs again ..