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ben_g
Inexperienced
Joined: May 16, 2008
Posts: 34
Location: North Wales
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Posted:
Sat May 24, 2008 7:44 pm |
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My ABS warning light (Audi 80 1.6 1994) comes on during the mini check when starting the car, goes off for second then comes back on and stays on. From doing a forum search and looking at this tutorial (http://20v.org/brakprob.htm#abs) it seems it could be a problem with the ABS relay. It should be under the dash so I took off the tray under the steering wheel but can't see a relay with a fuse on it. Any pointers to where it is, where else to look? Thanks for any help you can give,
Ben
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jas11n
Site ADMIN
Joined: Nov 21, 2003
Posts: 14191
Location: Durham, United Kingdom
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Posted:
Sat May 24, 2008 8:02 pm |
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Under the cover on the ABS unit itself, located under the bonnet |
_________________ 2001 Avus Silver RS4.
2004 A4 Avant 1.8T quattro Sport LE..
1995 S2 Coupe - sold
1995 A6 Avant TDi - sold
1993 80 TDi - sold
1990 90 2.3 auto - scrapped
1989 Coupe 2.3e - sold
1990 cq20v - sold
1990 80 2.8 quattro - sold |
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ben_g
Inexperienced
Joined: May 16, 2008
Posts: 34
Location: North Wales
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Posted:
Sat May 24, 2008 8:17 pm |
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jas11n wrote: | Under the cover on the ABS unit itself, located under the bonnet |
Thanks
Just had a quick look and I will need to buy a torx screwdriver to get the black plastic cover off. Am I right that if the fuse on this relay is blown then I will need to get a new relay? any idea of the cost where best to get one? |
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Mikes2
Site Moderator
Joined: Jan 31, 2003
Posts: 9144
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Posted:
Sat May 24, 2008 9:07 pm |
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A 1994 car does not have the same system - there is no relay with the fuse on top. |
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dick-dasterdley
Newbie
Joined: Feb 17, 2008
Posts: 17
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Posted:
Mon May 26, 2008 9:07 am |
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ben_g wrote: | jas11n wrote: | Under the cover on the ABS unit itself, located under the bonnet |
Thanks
Just had a quick look and I will need to buy a torx screwdriver to get the black plastic cover off. Am I right that if the fuse on this relay is blown then I will need to get a new relay? any idea of the cost where best to get one? |
The only place you'll get the ABS relays from are Audi dealers, I know this 'cos I'm having ABS trouble on my A8 at the mo...cost about £30... |
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ben_g
Inexperienced
Joined: May 16, 2008
Posts: 34
Location: North Wales
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Posted:
Mon May 26, 2008 10:21 am |
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dick-dasterdley wrote: | ben_g wrote: | jas11n wrote: | Under the cover on the ABS unit itself, located under the bonnet |
Thanks
Just had a quick look and I will need to buy a torx screwdriver to get the black plastic cover off. Am I right that if the fuse on this relay is blown then I will need to get a new relay? any idea of the cost where best to get one? |
The only place you'll get the ABS relays from are Audi dealers, I know this 'cos I'm having ABS trouble on my A8 at the mo...cost about £30... |
Thanks, doesn't sound like it will be too expensive then. Do you think it is likely to be a relay then (seeing as the light stays on regardless of whether the car is moving or not)? Thanks again for any help,
ben |
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NineNails
Site Moderator
Joined: Jun 01, 2003
Posts: 3351
Location: North Wales
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Posted:
Mon May 26, 2008 10:38 am |
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Could be an open circuit on a wheel sensor.
Si. |
_________________ 2000/w Audi A4 1.8T quattro Sport
Proud sponsor of the snack food industry.
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ben_g
Inexperienced
Joined: May 16, 2008
Posts: 34
Location: North Wales
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Posted:
Mon May 26, 2008 10:46 am |
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NineNails wrote: | Could be an open circuit on a wheel sensor.
Si. |
Thanks, I will try to check them too then. Any tips on how to get them/test them? thanks,
ben |
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nogin
Account deactivated by user request
Joined: Oct 05, 2004
Posts: 5606
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Posted:
Mon May 26, 2008 1:00 pm |
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Ninenails has hit the nail on the head wheel sensors everytime and they cost a packet
My advice is to disable it, rip it out and bin it, more trouble than they are worth
If you want relays then PM me i have plenty and they are all working because they never break in my experience |
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ben_g
Inexperienced
Joined: May 16, 2008
Posts: 34
Location: North Wales
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Posted:
Mon May 26, 2008 6:04 pm |
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nogin wrote: | Ninenails has hit the nail on the head wheel sensors everytime and they cost a packet
My advice is to disable it, rip it out and bin it, more trouble than they are worth
If you want relays then PM me i have plenty and they are all working because they never break in my experience |
Thanks nogin, I'll try and check them this week and I might take you up on the offer if it comes to that |
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Mikes2
Site Moderator
Joined: Jan 31, 2003
Posts: 9144
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Posted:
Mon May 26, 2008 7:27 pm |
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NineNails wrote: | Could be an open circuit on a wheel sensor.
Si. |
Very much doubt it is a wheel sensor.
Wheel sensors only start to work when the vehicle moves. In this case the ABS light is on before the car has moved.
The modulator does a self test when first started. There are 2 relays inside the modulator which will trigger the light if they fail. |
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Raven
Audi Nut
Joined: Jun 19, 2006
Posts: 55
Location: Warwickshire - and Dublin!
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Posted:
Sat Mar 30, 2019 11:32 am |
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Gents, I'm suffering a similar issue: the ABS warning lights comes on at ignition - and stays on. I've had an auto electrician look at it but says he can't get the abs to 'talk' to his diagnostic laptop unit. My car is a 1994 Tdi Avant. I read elsewhere that 1994 was a 'watershed' year: pre 1994, the ABS couldn't be interrogated, 1994-on, it could. I've taken the cover off the modulator and noted the two relays within, so I guess those are the items Mikes2 refers to here(?) Elsewhere, I read about one behind the dash, incorporating a 10amp fuse: I'll look at that forthwith - mindful of Mike2's advice that these don't feature on 1994 models, yet conscious mine may be a 'crossover' car (not the first time this has happened to me!).
So: any advice you might have would be gratefully received. Also, suggestions for reliable sources for parts: the garage is talking about four new sensors, replacing the ECU and / or ABS control unit. All of which sounds pricey...! |
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Mikes2
Site Moderator
Joined: Jan 31, 2003
Posts: 9144
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Posted:
Mon Apr 08, 2019 6:31 pm |
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Find another garage. They don't know what's wrong and want you to pay for their guesswork.
There is unlikely anything wrong with the sensors if the light isn't going off after first coming on.
The changeover was 1993.
ecu is under the rear seat - what's the number from that ?
There is a fuse in the main fusebox for abs and a few other circuits.
Does the abs pump run it's self test ? |
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Raven
Audi Nut
Joined: Jun 19, 2006
Posts: 55
Location: Warwickshire - and Dublin!
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Posted:
Mon Apr 08, 2019 8:46 pm |
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Thank you so much for taking the time and trouble to reply. Below some responses to your comments and questions
Find another garage. They don't know what's wrong and want you to pay for their guesswork.
Yup, the electrician certainly doesn't seem to have any answers - but he does at least admit that (cold comfort when you must foot the bill)
There is unlikely anything wrong with the sensors if the light isn't going off after first coming on.
Oddly enough, I thought this also - although my own suspicions were based on the observation that the light goes on - and remains so - yet the wheels haven't turned... so the sensors can't have taken a reading(?)
The changeover was 1993.
Oh! ok. So my car wasn't manufactured during any nebulous 'crossover' period then. Good to know.
ECU is under the rear seat - what's the number from that?
Under the rear seat? Oh. I read somewhere that with an Avant, it's located near the wheel arch. I've certainly seen something which resembles an ECU there. I don't currently have the car to hand, but once it's back, I'll have a good poke around again - and confirm the part number.
There is a fuse in the main fusebox for abs and a few other circuits.
Jesus, I'd hope the electrician had thought to check the fuses - please God, tell me he did! At some point down the years, the sticker peeled off the fusebox cover so I had to refer to online pics - but then failed to see the listing for fuse 31: ABS. I'll check that asap. I've also heard tell of an ABS relay with integral fuse located under the rear passenger seat...?
Does the abs pump run it's self test?
I believe this is audible(?) I haven't heard anything
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