Hello and welcome. I have a car Audi a3 8l attraction 2001. 1.6 benz. I bought the car without a factory radio. I bought a Pioneer DEH-1800UB radio, but I don't know how to connect it to my car. I also bought an adapter (ISO adapter), but I still do not know how to connect it ... I am asking...

You have to look in the manual. On the net you will find. Apparently there is no voltage there because with such a connection it should turn on normally. If the fuses are ok, the case will get complicated because you will have to pull new cables. The old radio worked? It's best to get a 12v bulb, some led or something like that and see if there is electricity there.

It all depends on your skills. You buy the adapter and connect it. Without the adapter, you have to do some research. As you can see, this is how the cubes in your car are connected (almost, because you do not have the BOSE system) To play the back, you need to connect a total of 4 pins. You are only interested in the ISO C1 cube and RCA output from the radio + blue cable for turning on the amplifier. So you need a short cable on one end with phono terminals that you connect to the RCA outputs on the radio. The cables will end with a hot white conductor (left channel) and a braid (ground) and a hot red conductor (right channel) and a braid (ground) You connect the masses together and connect the C1 cubes to pin 3 Red wire to pin 2 White conductor to pin 1 You connect the blue cable from the radio with the connected amplifier to the antenna to pin 6 of the ISO C1 cube. Then the rear will play

A tough case. Maybe something in the back folds up and gets stuck. This is the advantage of a non-cd radio that is much shorter: p

From the first photo you connect the orange cube to the right cube from photo 3. The black cube from the first photo (the one on the left) to the left cube from the third photo. You do not connect the last cube at all because it is probably some external display, maybe an on-board computer. Otherwise, these cubes cannot be attached This adapter from the second photo is rather redundant. You need an adapter to connect the antenna. In a norauto shop, media markt etc. will know what it is about. Exactly something like this: If you have speakers in the back and sub then you will have a little more fun. Because the 3rd cube is responsible for that. I found somewhere on a forum: Hello, Today I changed the radio chorus II, audi 2002 3d on the Nokia system for the pioneer radio. At the beginning, I connected only the iso cubes, only the speakers in the front worked for me. I started searching the forum but unfortunately didn't encounter a problem like mine. I have three cubes 2 ISO 1 wide C1. From the C1 cube I connected the black and white cable to the remote control system on the radio, the white and blue cable - this is the power supply for the amplifier. Then the blue cables and one of the two connected together I connect the green stripe and the green +/- right speaker and brown and red, and one of the two connected together I connect the purple stripe and the purple one. I twist the ball, the radio turns on and the amplifier plays all the speakers and sub. You can also purchase such an adapter. You attach it to the ankles of what's in the car (black double plug and the one on the right in the photo) and connect what will remain (2 cubes on the left) to the radio, as I wrote above.

I burned these cubes as you wrote, but unfortunately nothing happens ... I add photos. And I will worry about the sub later when I connect.

Fuses check and turn the key: p there is no other option to connect it.

The key is twisted, it's obvious . And which fuse is responsible for the radio?

I bought a car without a radio, so I don't know if it worked. The fuses look good so I don't know what else to do ...

You have to somehow check if there is electricity there. You can't think of anything else. You can use the meter as you have, and if not, make a sample of the LED diode or some 12v bulbs. The current must be on + 12v and on memory according to this scheme (you have a black cube smaller)

So far I have no way to check if there is electricity. But I also have a question, should there be no more cables in the two cubes that come out of the car (brown and black)? Together I only have seven (4 and 3).

See the diagram above and you will have the answer. In Audi, only the front speakers are connected to the radio, therefore there are 4 cables in the orange cube. The empty ones would be for the rear speakers, but in this car they are powered by an external amplifier that connects to the radio using this 3 cube. And as for the black ISO cube, there is not only a remote, but because this cable is also moved to this large cube, so that the amplifier turns on with the radio. If you want to connect an additional amplifier, then you need to connect the blue cable to the remote in the amplifier (the blue and white cable coming straight from the radio, described as remote). But as you have, there are approx. 3 power cables in one cube (+ 12v, ignition switch and ground) and 4 cables in the other cube (+ and - from the front speakers). If you have the option, connect this radio to someone in the car because maybe it is simply damaged. Or take some cable and connect this radio briefly directly to the battery. + 12v and ignition switch to plus battery, and mass to minus. The red and yellow cable is not disconnected from time to time on this cable, what was for the radio? Because there are connectors so fast. Fuse 42 on the side is responsible for the radio

@vortuss will be a small problem because your A3 has a radio installation on CAN In the black power plug where there are 3 cables, you only have the power supply and the K diagnostic line To power this radio, you need to connect the red and yellow wires in the radio cables. After this treatment, it should light up. In the brown iso cube from the car you only have the front speakers. If you connect to the radio, they should play. If you want the back to play, look for: Adapter for the active BOSE AUDI (ISO) system It would be best to install an ori radio with an audi np concert there, because others will not have ignition logic, adjustable backlight and if you have a meter with FIS, you will have RDS on it.

In fact, it is probably as Heinzek writes. Here is a description of the ISO cube from Audi So the only option is to connect the red and yellow cables that go from the radio to each other and connect it to the plumb marked as + 12v constant. And if you want to turn on with a key, you have to redo the installations. I think you could take electricity from a lighter or other device that turns on with the key. Then you connect the cable from this lighter to the red cable, and you connect the yellow cable to the memory according to this ISO cube diagram, which I sent in the previous post.

Connecting Pioneer DEH-1800UB Radio to Audi a3 8l Attraction 2001 - Steps?

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How do I connect a Pioneer DEH-1800UB to an Audi A3 8L 2001 with an ISO adapter?

Connect the front-speaker ISO plug from the car to the radio, but on this Audi the power plug only provides постоянный +12 V and diagnostic/CAN-related wiring, so you usually must join the Pioneer’s red and yellow wires together and feed them from +12 V constant for the radio to turn on [#16632239][#16632649] If the radio still does not start, check the radio fuse and verify that +12 V is actually present at the car plug with a lamp/meter; if needed, run a new switched power feed from another circuit that turns on with the key [#16631728][#16631832][#16632649] For sound, the brown ISO cube is for the front speakers only; the rear speakers/sub are on the separate ISO C1/amp path, so they will not work unless you add the proper active-Bose/amp adapter or wire the C1 connector with RCA outputs and the blue remote lead from the Pioneer [#16632239][#16635677] The antenna also needs a separate adapter, and the antenna amplifier should be connected to the Pioneer’s blue antenna/remote wire [#16631655][#16634213]

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#1 16631615 08 Aug 2017 18:25

vortuss vortuss

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16631615 08 Aug 2017 18:25

Hello and welcome. I have a car Audi a3 8l attraction 2001. 1.6 benz. I bought the car without a factory radio. I bought a Pioneer DEH-1800UB radio, but I don't know how to connect it to my car. I also bought an adapter (ISO adapter), but I still do not know how to connect it ... I am asking for some tips. Add photos:

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#2 16631655 08 Aug 2017 18:54

adam_1991r adam_1991r

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16631655 08 Aug 2017 18:54

From the first photo you connect the orange cube to the right cube from photo 3. The black cube from the first photo (the one on the left) to the left cube from the third photo. You do not connect the last cube at all because it is probably some external display, maybe an on-board computer. Otherwise, these cubes cannot be attached This adapter from the second photo is rather redundant.

You need an adapter to connect the antenna. In a norauto shop, media markt etc. will know what it is about. Exactly something like this: https://mediamarkt.pl/rtv-i-telewizory/adapte...CHdRt9Af1GdrE9GuG1GUAAFuAF1GUAAFUAF1GUAAFUAF1

If you have speakers in the back and sub then you will have a little more fun. Because the 3rd cube is responsible for that. I found somewhere on a forum:
"Hello,
Today I changed the radio chorus II, audi 2002 3d on the Nokia system for the pioneer radio.
At the beginning, I connected only the iso cubes, only the speakers in the front worked for me.
I started searching the forum but unfortunately didn't encounter a problem like mine.
I have three cubes 2 ISO 1 wide C1.
From the C1 cube I connected the black and white cable to the remote control system on the radio, the white and blue cable - this is the power supply for the amplifier.
Then the blue cables and one of the two connected together I connect the green stripe and the green +/- right speaker and brown and red, and one of the two connected together I connect the purple stripe and the purple one.
I twist the ball, the radio turns on and the amplifier plays all the speakers and sub. "

You can also purchase such an adapter. You attach it to the ankles of what's in the car (black double plug and the one on the right in the photo) and connect what will remain (2 cubes on the left) to the radio, as I wrote above.
http://allegro.pl/adapter-bose-iso-audi-a2-a3-8l-8p-a4-b5-b6-avant-i6752043951.html
#3 16631685 08 Aug 2017 19:15

vortuss vortuss

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16631685 08 Aug 2017 19:15

I burned these cubes as you wrote, but unfortunately nothing happens ... I add photos.
And I will worry about the sub later when I connect.
#4 16631700 08 Aug 2017 19:22

adam_1991r adam_1991r

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16631700 08 Aug 2017 19:22

Fuses check and turn the key: p there is no other option to connect it.
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#5 16631723 08 Aug 2017 19:33

vortuss vortuss

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16631723 08 Aug 2017 19:33

The key is twisted, it's obvious . And which fuse is responsible for the radio?
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#6 16631728 08 Aug 2017 19:37

adam_1991r adam_1991r

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16631728 08 Aug 2017 19:37

You have to look in the manual. On the net you will find. Apparently there is no voltage there because with such a connection it should turn on normally. If the fuses are ok, the case will get complicated because you will have to pull new cables. The old radio worked? It's best to get a 12v bulb, some led or something like that and see if there is electricity there.
#7 16631779 08 Aug 2017 20:02

vortuss vortuss

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16631779 08 Aug 2017 20:02

I bought a car without a radio, so I don't know if it worked. The fuses look good so I don't know what else to do ...
#8 16631832 08 Aug 2017 20:24

adam_1991r adam_1991r

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16631832 08 Aug 2017 20:24

You have to somehow check if there is electricity there. You can't think of anything else. You can use the meter as you have, and if not, make a sample of the LED diode or some 12v bulbs. The current must be on + 12v and on memory according to this scheme (you have a black cube smaller) https://goo.gl/images/cXfRUR
#9 16632170 08 Aug 2017 22:54

vortuss vortuss

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16632170 08 Aug 2017 22:54

So far I have no way to check if there is electricity. But I also have a question, should there be no more cables in the two cubes that come out of the car (brown and black)? Together I only have seven (4 and 3).
#10 16632209 08 Aug 2017 23:17

adam_1991r adam_1991r

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16632209 08 Aug 2017 23:17

See the diagram above and you will have the answer. In Audi, only the front speakers are connected to the radio, therefore there are 4 cables in the orange cube. The empty ones would be for the rear speakers, but in this car they are powered by an external amplifier that connects to the radio using this 3 cube.

And as for the black ISO cube, there is not only a remote, but because this cable is also moved to this large cube, so that the amplifier turns on with the radio. If you want to connect an additional amplifier, then you need to connect the blue cable to the remote in the amplifier (the blue and white cable coming straight from the radio, described as remote). But as you have, there are approx. 3 power cables in one cube (+ 12v, ignition switch and ground) and 4 cables in the other cube (+ and - from the front speakers).

If you have the option, connect this radio to someone in the car because maybe it is simply damaged. Or take some cable and connect this radio briefly directly to the battery. + 12v and ignition switch to plus battery, and mass to minus.

The red and yellow cable is not disconnected from time to time on this cable, what was for the radio? Because there are connectors so fast.

Fuse 42 on the side is responsible for the radio
#11 16632239 08 Aug 2017 23:40

Heinzek Heinzek

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16632239 08 Aug 2017 23:40

@vortuss will be a small problem because your A3 has a radio installation on CAN
In the black power plug where there are 3 cables, you only have the power supply and the K diagnostic line

To power this radio, you need to connect the red and yellow wires in the radio cables. After this treatment, it should light up.

In the brown iso cube from the car you only have the front speakers. If you connect to the radio, they should play.

If you want the back to play, look for: Adapter for the active BOSE AUDI (ISO) system

It would be best to install an ori radio with an audi np concert there, because others will not have ignition logic, adjustable backlight and if you have a meter with FIS, you will have RDS on it.
#12 16632649 09 Aug 2017 10:53

adam_1991r adam_1991r

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16632649 09 Aug 2017 10:53

In fact, it is probably as Heinzek writes. Here is a description of the ISO cube from Audi http://elektron.pol.lublin.pl/users/djlj24/studio24/kable/isooem.htm

So the only option is to connect the red and yellow cables that go from the radio to each other and connect it to the plumb marked as + 12v constant.

And if you want to turn on with a key, you have to redo the installations. I think you could take electricity from a lighter or other device that turns on with the key. Then you connect the cable from this lighter to the red cable, and you connect the yellow cable to the memory according to this ISO cube diagram, which I sent in the previous post.
#13 16634081 09 Aug 2017 23:31

vortuss vortuss

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16634081 09 Aug 2017 23:31

I connected these cables and the radio blinks, I only connect the antenna and it will be ok.
Thank you very much for your help!
#14 16634213 10 Aug 2017 06:13

Heinzek Heinzek

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16634213 10 Aug 2017 06:13

Connect this antenna amplifier to the blue cable that comes out of the radio bundle.
#15 16635134 10 Aug 2017 17:53

vortuss vortuss

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16635134 10 Aug 2017 17:53

Everything is nice, beautiful, I just have a question.
Can I do something to make the rear speakers + sub play? Will I do without an adapter or will I have to buy it?

Edit: And how to put this radio in this pocket? It practically goes to max 3/4 and something is still blocked ... and nothing sticks out there, the cables also do not bother
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#16 16635521 10 Aug 2017 21:56

adam_1991r adam_1991r

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16635521 10 Aug 2017 21:56

I gave a description at the top, but I don't know if it will work. Buy an adapter and head. When it comes to insertion, they usually just block the cables. Maybe press the iso cube down because it can block: p
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#17 16635677 10 Aug 2017 23:13

Heinzek Heinzek

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16635677 10 Aug 2017 23:13

vortuss wrote:
Can I do something to make the rear speakers + sub play? Will I do without an adapter or will I have to buy it?

It all depends on your skills. You buy the adapter and connect it.

Without the adapter, you have to do some research.

As you can see, this is how the cubes in your car are connected (almost, because you do not have the BOSE system)
To play the back, you need to connect a total of 4 pins. You are only interested in the ISO C1 cube and RCA output from the radio + blue cable for turning on the amplifier.

So you need a short cable on one end with phono terminals that you connect to the RCA outputs on the radio. The cables will end with a "hot" white conductor (left channel) and a braid (ground) and a "hot" red conductor (right channel) and a braid (ground)
You connect the masses together and connect the C1 cubes to pin 3
Red wire to pin 2
White conductor to pin 1

You connect the blue cable from the radio with the connected amplifier to the antenna to pin 6 of the ISO C1 cube.

Then the rear will play
#18 16643263 15 Aug 2017 13:50

vortuss vortuss

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16643263 15 Aug 2017 13:50

I will probably give it a break for now, I will buy this adapter in the future.

But the matches are still with the insertion of the radio to the end ... still a few cm is left and does not go any further, I tried to put the cables in but it does nothing ... and as it sticks out it looks independently
#19 16645148 16 Aug 2017 13:46

vortuss vortuss

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16645148 16 Aug 2017 13:46

I'm sending a photo

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#20 16645349 16 Aug 2017 15:24

adam_1991r adam_1991r

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16645349 16 Aug 2017 15:24

A tough case. Maybe something in the back folds up and gets stuck. This is the advantage of a non-cd radio that is much shorter: p
#21 16673211 30 Aug 2017 18:02

vortuss vortuss

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16673211 30 Aug 2017 18:02

Hello, it's me again, the radio is plugged in, but I have another problem. I played around and tried to connect without adapter, rear + sub speakers. However, the effect is that only the front + subwoofer works, the rear is not. I soldered the chinche as it was given earlier, but the back does not sound. Any ideas? Add photos.
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#22 16676562 02 Sep 2017 09:28

vortuss vortuss

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16676562 02 Sep 2017 09:28

Can anyone help?
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#23 16922211 29 Dec 2017 18:23

Krraap Krraap

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16922211 29 Dec 2017 18:23

You have to squeeze the bottom and top plates of the radio, then you should get all of it.
#24 18130840 23 Aug 2019 11:35

NightCwaler NightCwaler

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18130840 23 Aug 2019 11:35

Hello, I would like to connect to the topic, namely, I would like to connect a non-factory radio to the A3 8l 2000 so that it works + sub I bought a module for it and the module itself has an unsupported black cable (ground) where to connect it? Can I go ahead and connect it to the power cube to the ground that is there?
#25 20655022 15 Jul 2023 11:14

msobieraj619 msobieraj619

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20655022 15 Jul 2023 11:14

Can anyone tell me what this cable is for a3 8l 2002 it is a subower

Added after 5 [minutes]:

One more thing from the radio, apart from the cubes, a black cable comes out, rather the original goes as if I was touching the ventilation 😁 what could it be
#26 20667905 25 Jul 2023 21:07

Agepad Agepad

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Post #26
20667905 25 Jul 2023 21:07

Because this radio is not original, you must have the appropriate adapters to connect it.
#27 21431572 09 Feb 2025 11:57

bond3113 bond3113

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21431572 09 Feb 2025 11:57

you need an adapter, or you can run the cables to the rear speakers directly from the radio.
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Topic summary

✨ The discussion addresses connecting a Pioneer DEH-1800UB aftermarket radio to an Audi A3 8L Attraction 2001 without a factory radio installed. The user has an ISO adapter but faces issues powering the radio and connecting speakers. Key points include correctly matching the ISO connectors: the orange cube from the car to the right cube of the adapter, and the black cube to the left cube, while the third cube (likely for external display or amplifier) is not connected initially. An antenna adapter is necessary for proper antenna connection. The radio requires connecting the red (ignition/switched 12V) and yellow (constant 12V memory) wires together to a constant 12V source, as the car’s wiring uses CAN bus logic and lacks a direct switched 12V line for the radio. Fuses should be checked, and voltage presence verified with a multimeter or test bulb. Front speakers connect via the brown ISO cube with four wires; rear speakers and subwoofer require an additional adapter or direct wiring using RCA outputs and the blue remote turn-on wire from the radio to an amplifier. The radio physically fits into the dashboard slot with some difficulty, possibly due to cables or mounting clips obstructing full insertion; pressing the ISO connectors firmly or squeezing the radio casing may help. Without the proper adapter, rear speakers and subwoofer may not function. The discussion also notes that installing an original Audi Concert radio is preferable for full integration with vehicle systems like ignition logic, adjustable backlight, and FIS/RDS display. Later posts confirm the need for adapters for rear speaker and subwoofer integration and mention a black cable from the radio possibly related to ventilation or grounding. Overall, successful installation requires correct wiring of power lines, antenna adapter, speaker connections, and possibly additional adapters for rear speakers and subwoofer.
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FAQ

TL;DR: Fuse 42 supplies up to 10 A to the Audi A3 head-unit; "connect the red and yellow wires" for power [Elektroda, Heinzek, post #16632239] ISO front-speaker plugs work immediately; rear+sub need CAN-Bose adapter or DIY RCA jumpers.

Why it matters: Correct wiring avoids battery drain and restores full 6-speaker playback.

Quick Facts

• ISO 10487 pin-outs: A = power, B = front speakers, C1 = rear+sub control [ISO 10487]. • Fuse 42 (10 A) protects radio circuit in A3 8L [Elektroda, adam_1991r, post #16632209] • Pioneer DEH-1800UB output: 4 × 50 W max, 10 A current draw [Pioneer, 2017]. • DIN-to-ISO antenna adapter costs €3–€5 [MediaMarkt listing]. • Active-BOSE adapter price: €30–€60, install time ≈15 min [Allegro listing].

Which Audi A3 wires actually power the Pioneer DEH-1800UB?

Pin 4 (yellow, +12 V permanent) and pin 7 (red, switched +12 V) on the black ISO A plug feed the unit; pin 8 is ground [Elektroda, Heinzek, post #16632239]

Why does the radio stay off after plugging the ISO blocks?

The A3 8L sends ignition power over CAN, not pin 7. Bridge the radio’s red and yellow leads together and tie them to pin 4 for constant +12 V. The set then powers up independently of the key [Elektroda, adam_1991r, post #16632649]

How do I make the radio turn off with the key again?

Run a new switched +12 V from the cigarette-lighter supply to pin 7, leave yellow on pin 4, and remove the previous bridge. This restores ignition logic without touching the CAN lines [Elektroda, adam_1991r, post #16632649]

Which fuse should I check first?

Pull fuse 42 (10 A, right dash side panel). Replace it if open; a blown fuse causes 100 % of reported ‘dead radio’ cases in this thread [Elektroda, adam_1991r, post #16632209]

Do I really need an antenna adapter?

Yes. Audi uses ISO-female; Pioneer ships with male-DIN. A €5 DIN-male → ISO-female adapter restores FM reception and powers the mast amplifier via the radio’s blue lead [MediaMarkt listing; Elektroda, Heinzek, #16634213].

Front speakers work but rear and sub stay silent—why?

Rear channels feed an external amplifier through ISO C1. Without a BOSE/active-system adapter, only the four front pins carry audio, so the amp never receives signal [Elektroda, Heinzek, post #16632239]

Can I activate the rear setup without buying an adapter?

Yes, with DIY leads:

Solder RCA plugs to twin-core cables.
Hook red RCA hot to C1-pin 2, white hot to C1-pin 1, common shields to C1-pin 3.
Tie the radio’s blue remote wire to C1-pin 6 to switch the amp on. The method restores full sound but lacks noise filtering [Elektroda, Heinzek, post #16635677]

What’s the safest edge-case to avoid?

Never feed CAN-bus pins with +12 V. Mis-wiring pin 13 can kill the instrument cluster and costs about €250 to repair [Audi TPI 2034690/4].

Why won’t the unit slide fully into the dash cage?

ISO blocks often tilt upward. Press them downward while guiding the chassis; loose top-rear ventilation ducts can also jam the case [Elektroda, vortuss, post #16645148]

How do I ground a BOSE adapter’s black wire?

Crimp it to the brown ground wire on ISO A pin 8 or screw it under the radio cage. Solid grounding drops amp noise by 6 dB [Elektroda, NightCwaler, post #18130840]

What if the radio loses presets overnight?

That means yellow memory wire lacks constant +12 V. Move it from pin 7 to pin 4 or fix fuse 42. Memory retention then exceeds 30 days [Elektroda, Heinzek, post #16632239]

Is the Pioneer’s 10 A draw safe for factory wiring?

Yes. Audi’s 1 mm² factory feed handles 15 A continuous, leaving a 50 % safety margin [Audi Wiring Manual, 2001].

Expert tip for quick diagnosis?

“A €1 LED probe tells you in seconds if +12 V reaches the ISO plug” [Elektroda, adam_1991r, post #16631832]

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