Any one know how to check this parts?

[wafi ahmed]

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I never heard it’s beeping since I bought this car. It’s a horn that should sound when lock/unlock the car.


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[old guy]

The batteries have gone bad and have probably corroded the circuit board. Google Audi siren repair and you will find numerous DIY's for a potential fix.

[Kevin C]

Hacksaw around the seam... BTW, yours looks bad. The corroded pin on the connector is a giveaway.

[wafi ahmed]

Hacksaw around the seam... BTW, yours looks bad. The corroded pin on the connector is a giveaway.

Do you think it’s worth repairing or just buy another used one?

I have been searching for months. And found that it’s possible to use different batteries and make it work again.


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[old guy]

Do you think it’s worth repairing or just buy another used one?

I have been searching for months. And found that it’s possible to use different batteries and make it work again.

Unfortunately a used one is likely to have the same corrosion. Cut yours open and see if it is repairable. If not, get a used one but cut that one open and make sure it hasn't also started to corrode.

I was able to clean mine up and replaced the battery with one from a dog collar. It has been good now for at least 5 years.

[wafi ahmed]

Unfortunately a used one is likely to have the same corrosion. Cut yours open and see if it is repairable. If not, get a used one but cut that one open and make sure it hasn't also started to corrode.

I was able to clean mine up and replaced the battery with one from a dog collar. It has been good now for at least 5 years.

I decided to solder a new battery. Where can I get a battery? I want to fix it quick. If I order from eBay it’s gonna take long.


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[Kevin C]

I went through this with my alarm horn. The original one in my A4 got eaten pretty badly. I soldered in a new battery and jumpered the PCB. Because the connector was corroded it never worked right. Yours will probably have the same issue. My advice is to buy a good used one from a later model car with the superseded PN. I got one from a 2008. I still cut it apart to inspect the battery. The used one was perfect. I also sprayed the PCB with clear acrylic paint to act as a conformal coating. If that battery leaks hopefully the PCA wont get as corroded.

PN you want to look for: 8L0951605A You will want to get a pig tail since the battery leak also takes out the pin in the connector. Ebay one from as late a model Audi as you can find that uses that part number.

Once the alarm has stopped working and has been dead for a while the battery will have leaked so badly it's a lost cause. Cut it open to confirm, but that been my experience.

This looks to be a good one... You will still need to find a pig tail.

https://www.ebay.com/itm/02-08-Audi-...ss!97211!US!-1

[Kevin C]

This one has a pig tail and is from a 2008... $50.

Also there is a code number on the alarm. Higher = newer. 78xxx is typically 2008. The one I linked to is code # 79212

https://www.ebay.com/itm/2008-Audi-A...QAAOSwt3hcBp5U

PN you want to look for: 8L0951605A

Code # VS Year. Codes from various horns on Ebay vs what year car they came from.
78507 2008
78720 2008
79212 2008
79205 2008
78720 2008
78410 2007
68719 2007
68302 2006
58705 2006
48529 2005
48531 2005
48910 2005
48910 2005
49819 2005
49130 2005
39123 2004
39217 2004

[wafi ahmed]

This one has a pig tail and is from a 2008... $50.

Also there is a code number on the alarm. Higher = newer. 78xxx is typically 2008. The one I linked to is code # 79212

https://www.ebay.com/itm/2008-Audi-A...QAAOSwt3hcBp5U

Code # VS Year. Codes from various horns on Ebay vs what year car they came from.
785072008
787202008
792122008
792052008
787202008
784102007
687192007
683022006
587052006
485292005
485312005
489102005
489102005
498192005
491302005
391232004
392172004

I still need to cut it open to see if I could fix it cheep. Thank you for good information!!
I will update soon as I open the module.


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[wafi ahmed]

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What do you think?


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[wafi ahmed]

IMG_0715.JPG

Should I buy another one?


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[wafi ahmed]

IMG_0716.JPG


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[old guy]

That's about what mine looked like. Maybe a little worse. I cleaned it up and had to resolder a few areas. Then brushed a clear sealer over all of the previously corroded areas. Installed a new battery and it has been working ever since.

You will need a 7.2v NiMH battery with at least a 200 mAh capacity. Numerous to choose from. Clicky click®

[wafi ahmed]

That's about what mine looked like. Maybe a little worse. I cleaned it up and had to resolder a few areas. Then brushed a clear sealer over all of the previously corroded areas. Installed a new battery and it has been working ever since.

You will need a 3.6v NiMH battery with at least a 200 mAh capacity. Numerous to choose from. Clicky click

How did you cleaned it? Electric cleaner?


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[wafi ahmed]

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I am planning to use this.


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[Kevin C]

Mine was worse... The connector on yours did get corroded so check the mating connector ( mine went intermittent and caused a lot of false alarms). If you fix your current unit your still going to end up spending $12 for a battery and may still need a pigtail. $35 more gets you a unit that's up to five years newer a better design and a new connector and you don't have to screw around with the old unit.

The used one I picked up was the newer design; No signs of leakage, it was plug and play. The only non plug and play part was replacing the connector. The acid from the battery leaks through the alarm housing and makes a mess of the terminal and the wire, that caused an intermittent connection.

[wafi ahmed]

Mine was worse... The connector on yours did get corroded so check the mating connector ( mine went intermittent and caused a lot of false alarms). If you fix your current unit your still going to end up spending $12 for a battery and may still need a pigtail. $35 more gets you a unit that's up to five years newer a better design and a new connector and you don't have to screw around with the old unit.

The used one I picked up was the newer design; No signs of leakage, it was plug and play. The only non plug and play part was replacing the connector. The acid from the battery leaks through the alarm housing and kames a mess of the terminal and the wire, that caused an intermittent connection.

Yeah. I got your point, I saw some videos that their alarm keep beeping while driving it.
But b7 alarm is 50$ and I don’t if that has a same problem or not.

I want to give a try with what old guy said. Solder a new battery.


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[Kevin C]

Yeah. I got your point, I saw some videos that their alarm keep beeping while driving it.
But b7 alarm is 50$ and I don’t if that has a same problem or not.

I want to give a try with what old guy said. Solder a new battery.


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Don't blame you on trying... IPA / rubbing alcohol is a good cleaner. Mine was really bad, so you have a decent chance on that one.


As a reference to what the newer versions I picked up on Ebay used looked like.


20190407_151334.jpg
20190407_151344.jpg

[Spike00513]

In my experience this seems like even more of a PITA with Avant models vs. sedan
(more difficult with Avant)

due to the hard to access location of the siren (rear right, requires removing lots of interior trim parts)
and the siren itself is also a different-looking unit. I assume different part number.

[wafi ahmed]

In my experience this seems like even more of a PITA with Avant models vs. sedan

due to the hard to access location of the siren (rear right, requires removing lots of interior trim parts)
and the siren itself is also a different-looking unit. I assume different part number.

For my sedan it was not that difficult. It took me about 5min.


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[wafi ahmed]

Don't blame you on trying... IPA / rubbing alcohol is a good cleaner. Mine was really bad, so you have a decent chance on that one.


As a reference to what the newer versions I picked up on Ebay used looked like.


20190407_151334.jpg
20190407_151344.jpg

Isn’t the electric parts cleaner is better?


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[shurur9]

Get a B7 siren/alarm with the mount bracket attached.

[old guy]

Get a B7 siren/alarm with the mount bracket attached.

Unfortunately Audi never completely fixed the problem. I have seen guys in the A4 B8 forum dealing with the same issue. If you pick up a used one it will still be worth opening it up and either replacing the battery as a preemptive measure or at a minimum seal the circuit board so when the battery corrodes it doesn't affect the circuit board.

[Kevin C]

Unfortunately Audi never completely fixed the problem. I have seen guys in the A4 B8 forum dealing with the same issue. If you pick up a used one it will still be worth opening it up and either replacing the battery as a preemptive measure or at a minimum seal the circuit board so when the battery corrodes it doesn't affect the circuit board.

Exactly what I did... My take was that going for the newest one that was compatible I upped my odds on finding one that had not been damaged. So far so good. That and the now coated board should be a bit tougher.

[slacktide]

So - for the record, a few things I've figured out over the past few weeks...

1: The B7 alarm, 8L0 951 605A, WILL work in the B6. At least it works fine in my 2002 Avant.

2: The B8 alarm, 1K0 951 605C, WILL NOT work in the B6.

3: The battery is not needed to make the alarm work. It is just there so that if someone is stealing your car and disconnects the car battery, the alarm will still continue to sound. I got 99 problems but that ain't one so I'm fine leaving it disconnected.

4: All of these alarms will eventually have their batteries burst. I cracked open the one in my 2014 S4, it was down to 2V but had not burst. One eBay one had burst and wrecked the board, another eBay one worked but the battery was down to 1 volt.

5: If your alarm still works, you might want to open it up and get rid of those old batteries.

6: A hacksaw is a really crude way to open it. The plastic at the seam is really thin, you can cut through it with a utility knife. Only need to go 1/8" deep, more than that and you can damage the circuit board.

7: If you did want to replace the battery with an external pack, here's a good one for $8 on eBay: https://www.ebay.com/itm/7-2V-Replac...9/273770673440 If the link goes bad, search by part number 1000EL00349.

[wafi ahmed]

So - for the record, a few things I've figured out over the past few weeks...

1: The B7 alarm, 8L0 951 605A, WILL work in the B6. At least it works fine in my 2002 Avant.

2: The B8 alarm, 1K0 951 605C, WILL NOT work in the B6.

3: The battery is not needed to make the alarm work. It is just there so that if someone is stealing your car and disconnects the car battery, the alarm will still continue to sound. I got 99 problems but that ain't one so I'm fine leaving it disconnected.

4: All of these alarms will eventually have their batteries burst. I cracked open the one in my 2014 S4, it was down to 2V but had not burst. One eBay one had burst and wrecked the board, another eBay one worked but the battery was down to 1 volt.

5: If your alarm still works, you might want to open it up and get rid of those old batteries.

6: A hacksaw is a really crude way to open it. The plastic at the seam is really thin, you can cut through it with a utility knife. Only need to go 1/8" deep, more than that and you can damage the circuit board.

7: If you did want to replace the battery with an external pack, here's a good one for $8 on eBay: https://www.ebay.com/itm/7-2V-Replac...9/273770673440 If the link goes bad, search by part number 1000EL00349.

I ordered one from eBay.
I will update if I could fix it, but the one that I ordered that is taking too long to deliver.


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[Kevin C]

So - for the record, a few things I've figured out over the past few weeks...

1: The B7 alarm, 8L0 951 605A, WILL work in the B6. At least it works fine in my 2002 Avant.

2: The B8 alarm, 1K0 951 605C, WILL NOT work in the B6.

3: The battery is not needed to make the alarm work. It is just there so that if someone is stealing your car and disconnects the car battery, the alarm will still continue to sound. I got 99 problems but that ain't one so I'm fine leaving it disconnected.

4: All of these alarms will eventually have their batteries burst. I cracked open the one in my 2014 S4, it was down to 2V but had not burst. One eBay one had burst and wrecked the board, another eBay one worked but the battery was down to 1 volt.

5: If your alarm still works, you might want to open it up and get rid of those old batteries.

6: A hacksaw is a really crude way to open it. The plastic at the seam is really thin, you can cut through it with a utility knife. Only need to go 1/8" deep, more than that and you can damage the circuit board.

7: If you did want to replace the battery with an external pack, here's a good one for $8 on eBay: https://www.ebay.com/itm/7-2V-Replac...9/273770673440 If the link goes bad, search by part number 1000EL00349.

I used a thin wood saw (pull saw), it came out fine. I have also used a hacksaw... Once you bond the housing back together you can't tell (I used urethane from Home Depot). More likely to slip and damage the unit or yourself with a knife. I have used both and got better results with a fine saw.


I have seen 8L0951605A. in late B6's (2004). Also since the battery is rechargeable, only having 2 volts may mean that it's just discharged. If you let them sit... Yea the battery goes dead. The pictures I have ( see a few posts up) of the alarm unit I pulled apart is from a B8 (1K0 951 605C), I was curious to see what the difference was. The pin out is different, that's as far as I got. It was a nice way to get a newer battery.

[wafi ahmed]

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Got it!!


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[wafi ahmed]

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[wafi ahmed]

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Do I need to clean this more?



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[wafi ahmed]

IMG_0732.JPG
Am I doing it wrong?


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[wafi ahmed]

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I connected the battery but it didn’t worked.
Battery had 8 volt which how it should.


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[slacktide]

The battery is not required for the alarm to work. It is only there as a backup if the main car battery is disconnected. It looks like the old battery has leaked acid and permanently damaged the circuit board. It appears that some of the surface-mount components have corroded off completely.

[wafi ahmed]

The battery is not required for the alarm to work. It is only there as a backup if the main car battery is disconnected. It looks like the old battery has leaked acid and permanently damaged the circuit board. It appears that some of the surface-mount components have corroded off completely.

The main battery is connected. I am probably gonna have to order another one.


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[wafi ahmed]

Any one know how to check the circuit board? I don’t know should I buy another one or fix this.


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[wafi ahmed]

Any body?


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[slacktide]

If you really really wanted to, you could use a multimeter to validate the continuity of each individual trace on the PCB. But it would be waste of time. Due to the extensive corrosion damage, there are most likely multiple places where it has failed. As noted above, there appear to be places where entire components have corroded and fallen off the board. It's time for a new part.

[wafi ahmed]

If you really really wanted to, you could use a multimeter to validate the continuity of each individual trace on the PCB. But it would be waste of time. Due to the extensive corrosion damage, there are most likely multiple places where it has failed. As noted above, there appear to be places where entire components have corroded and fallen off the board. It's time for a new part.

Well. Than I am gonna order the B7 one, since everyone here is saying that’s better.


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[slacktide]

Part number 8L0 951 605A worked for me. Make sure to order from a seller that says tested & working.

[wafi ahmed]

Part number 8L0 951 605A worked for me. Make sure to order from a seller that says tested & working.

I found few in the ebay. Should I also open the new one that I am gonna buy? Or just plug and play?


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