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Rear relay, placement of the pins
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Audi80
Novice
Mar 15, 2012, 2:49 AM
Post #1 of 16
(2002 views)
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Rear relay, placement of the pins
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There is a relay located under the backseat of my Audi 80, which is not connected. I need some sort of diagram or explanation of where the pins of the relay are supposed to be located. Also I need to figure out what it's for....
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speed
User
Mar 15, 2012, 10:30 AM
Post #2 of 16
(1946 views)
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Re: Rear relay, placement of the pins
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well wed be glad to help if we knew the year, engine, transmission type itd be helpful. and maybe a picture.
GM ASEP 26 SCC Milford ASE certified in Brakes and Electrical on Thursday April 5th 2012
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Audi80
Novice
Mar 16, 2012, 3:14 AM
Post #3 of 16
(1924 views)
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Re: Rear relay, placement of the pins
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year of manufacturing is 1992, with a 2.3e engine, manual transmission, and it's a sedan.
I'll post a picture of the car, and where the relay is located, later.
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samg.
User
Mar 16, 2012, 10:44 AM
Post #4 of 16
(1910 views)
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Re: Rear relay, placement of the pins
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I'm not seeing any relays under the seat according to alldata. I would assume if it has heated rear seats it could be in relation to that.
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Audi80
Novice
Mar 16, 2012, 12:17 PM
Post #5 of 16
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Re: Rear relay, placement of the pins
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This specific relay is related to the ABS module, which is also located under the back seat
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speed
User
Mar 16, 2012, 1:35 PM
Post #6 of 16
(1894 views)
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Re: Rear relay, placement of the pins
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so you have a relay plugged into the module but dont have anywires comingout the backside where the realy is plugged in?...if this is the case it could just be a spare relay. also if oyu have any check engine lights on it would be helpful to get it scanned, and if its an abs system relay i suspect you had a problem with your abs. get your abs code scanned and that will help tell you what its for.
GM ASEP 26 SCC Milford ASE certified in Brakes and Electrical on Thursday April 5th 2012
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Audi80
Novice
Mar 16, 2012, 4:07 PM
Post #7 of 16
(1881 views)
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Re: Rear relay, placement of the pins
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As the situation is at the moment, the relay is connected through individual wires on each pin. The problem is, to locate the specific hole, for the specific wire.
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Discretesignals
Ultimate Carjunky
/ Moderator
Mar 16, 2012, 4:21 PM
Post #8 of 16
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Re: Rear relay, placement of the pins
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What are the colors of the wires?
The ABS main relay is in the aux relay panel which is on the left side of the instrument panel
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Mar 16, 2012, 4:30 PM)
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speed
User
Mar 16, 2012, 5:15 PM
Post #9 of 16
(1854 views)
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Re: Rear relay, placement of the pins
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Have you any clue of what the relay is for?
GM ASEP 26 SCC Milford ASE certified in Brakes and Electrical on Thursday April 5th 2012
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nickwarner
Veteran
/ Moderator
Mar 16, 2012, 5:25 PM
Post #10 of 16
(1850 views)
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Re: Rear relay, placement of the pins
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Try actuating the control circuit of the relay and see what occurs. Its fuse protected if OEM and would end the mystery quickly. If memory serves, terminal 85 and 86 are power and ground. Terminal 30 is supply power to the load circuit and the default setting is terminal 87a. Terminal 87 is connected to load device when pull-in coil is energized. If my memory is a tad fuzzy on pin numbers I'm sure others here will correct me. If this thing is on individual spade connectors for each terminal then most likely someone else has wired this in and it will be necessary to find out why and if its fuse protected.
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Discretesignals
Ultimate Carjunky
/ Moderator
Mar 16, 2012, 5:29 PM
Post #11 of 16
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Re: Rear relay, placement of the pins
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I'd take a picture of it and post it up, to be sure it is an actual relay that your playing around with.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Audi80
Novice
Mar 20, 2012, 1:40 PM
Post #12 of 16
(1810 views)
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Re: Rear relay, placement of the pins
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Drawn diagram of the colours of the wires in the switch where, the relay is supposed to be connected : http://farm7.staticflickr.com/...491_5c594bbcfb_b.jpg
The relay and the switch :
(This post was edited by Discretesignals on Mar 20, 2012, 5:26 PM)
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Discretesignals
Ultimate Carjunky
/ Moderator
Mar 20, 2012, 5:48 PM
Post #13 of 16
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Re: Rear relay, placement of the pins
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Ok, this is making sense. The switch your mentioning is actually the relay socket. The relay that your attempting to wire up isn't the relay that was intended for that socket, so someone has used jumper wire to make an aftermarket 4 pin work with it, which it won't.
Don't attempt to plug that relay in there. The relay that belongs in there is called an ABS Combi relay. The relay has a special integrated circuit inside it that is used to close the relay contacts to supply power to the ABS control unit and the hydraulic control unit. Your best bet is to go to the dealer and get the correct relay. They aren't cheap which explains why someone was attempting to jerry rig it.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Mar 20, 2012, 5:57 PM)
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Audi80
Novice
Mar 20, 2012, 11:49 PM
Post #14 of 16
(1770 views)
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Re: Rear relay, placement of the pins
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I'll have to get a combi then 
but what is the worst thing that could happen, if I tried to plug it in?...
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Discretesignals
Ultimate Carjunky
/ Moderator
Mar 21, 2012, 5:01 AM
Post #16 of 16
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Re: Rear relay, placement of the pins
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If you get it wired wrong, you'll end up cooking the circuit. Even if you could get it to work, the relay would be stuck on the whole time while the vehicle is turned off which would drain your battery. The combi relay uses a transistor to turn on the relay when you have the ABS switch on. That explains the three control wires and two switch wires in the socket. That relay probably isn't rated for that socket anyway and will burn up when the pump motor comes on. If you look at the sticker on the floor panel, control unit is typed and not relay.
Hopefully the last person that was playing around with it didn't damage the circuit. You won't know if the circuit or ABS system is even operational until you get it powered up.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Mar 21, 2012, 5:08 AM)
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