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Does anyone have a wire diagram for air suspension control module of 2004 allroad?

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Old 01-23-2014, 09:13 AM   #1
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Default Does anyone have a wire diagram for air suspension control module of 2004 allroad?

Hi all,

I have a 2004 allroad with 2.7L engine. Its air suspension is not working properly. It can stay in certain level for a long time with no problem, but it will drop to to the lowest level if the speed exceeds around 70 mph, and won't come back to normal level. I trid to manually lock the car at level 2, but that was unlocked immediately even at 10 mph. Since speed is the one that will lead this drop, I am thinking to remove the input speed signal to the air suspension control module (J197?)so that the car will not ajust itself during driving, instead, controlled by me manually. I opened the side trim and found the control module, there are totally 25 wires connected to 25 out of 50 pins from the unit. I am not sure whether the green line (pin 15) is the input speed signal. Any help will be greatly appreciated. Also I have found some websites are selling coil springs to replace air springs, where they will ask customers to bypass four wires using their hardware, does anyone know the working principle? Thanks.

Leondrew
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Old 01-23-2014, 10:26 AM   #2
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Default This will work.

Good luck!
http://forums.audiworld.com/attachme...0&d=1389187860 <---Suspension wiring diagram.
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Old 01-23-2014, 10:45 AM   #3
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Thanks! Using my attached figures, can you tell which wire is for the speed input?
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Old 01-23-2014, 03:31 PM   #4
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The diagram shows A108 as the speed signal. That leads to the ws/bl (white/blue) wire at the #9 pin on connector.
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Old 01-23-2014, 07:05 PM   #5
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The diagram shows A108 as the speed signal. That leads to the ws/bl (white/blue) wire at the #9 pin on connector.
Cut wire # 9, tested on free way, dropped again, won't raise up. Conclusion: wrong wire or method. Thank you all the same
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Old 01-23-2014, 08:58 PM   #6
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Cut wire # 9, tested on free way, dropped again, won't raise up. Conclusion: wrong wire or method. Thank you all the same
Keep slowly! Speed signal tranmited by the CAN. If you want to fix suspension in one level - use manual mode or eremove fuse №17.
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Old 01-23-2014, 09:34 PM   #7
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Keep slowly! Speed signal tranmited by the CAN. If you want to fix suspension in one level - use manual mode or eremove fuse №17.
Thanks. I am wondering how to choose manual mode? Did you mean by pressing the up and down buttons simultaneously for a few seconds? What I need is just a fixed level such as Level 2 or 3. I can raise the car manually to level 3 after restart the engine, and it will remain at that level as long as I don't go to free way or exceed 70 mph.

Also, do you know where I can find fuse No.17? Is there any wire that is directly connected to that fuse from the suspension control unit? I am thinking to replace the air springs to coil springs if I cannot fix it at certain level after these tries. (The local audi dealer asked for more than $3,500 to replace the two front air bags which were leaking and the compressor according to their diagnosis. This is much higher than I had expected, and if the two rear bags begin to leak some day, that may cost another a few thousands.
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Old 01-23-2014, 11:22 PM   #8
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Search for SSP243 with Google. Pdf doc, insidie is the wiring diagram.
As far as I know you in MY2004 no manual mode is present. You can choose manual mode by pressing up or down for a few seconds (only one of them! - if you trigger both, the car goes into "jack mode" deactivating the suspension contolling - only for service works).

So read through SSP243. I my point, the control strategy is genial, basically. I would not recommend to modify the system (Anyway it would emit the yellow triangle as well.)
You either have a faulty control module, or rather a wiring problem, or the control module receives a false signal from any or more of the level senders. The latter one is the most probable. Bad or noisy signals can fool the whole system. Don't you have an oil leak on the front? It can make the senders' signal noisy as far as I experienced.
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Old 01-24-2014, 03:20 AM   #9
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Originally Posted by Leondrew View Post
Thanks. I am wondering how to choose manual mode? Did you mean by pressing the up and down buttons simultaneously for a few seconds? What I need is just a fixed level such as Level 2 or 3. I can raise the car manually to level 3 after restart the engine, and it will remain at that level as long as I don't go to free way or exceed 70 mph.

Also, do you know where I can find fuse No.17? Is there any wire that is directly connected to that fuse from the suspension control unit? I am thinking to replace the air springs to coil springs if I cannot fix it at certain level after these tries. (The local audi dealer asked for more than $3,500 to replace the two front air bags which were leaking and the compressor according to their diagnosis. This is much higher than I had expected, and if the two rear bags begin to leak some day, that may cost another a few thousands.
Could you explain reason of your complaints?
Fuse №17 installed under the left cover of dashboard.
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Old 01-24-2014, 07:46 AM   #10
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Could you explain reason of your complaints?
Fuse №17 installed under the left cover of dashboard.
No complaints. I just could not afford that money at this moment thus was seeking for an alternative way which makes sense to me. If the speed signal is the only factor that can bring the car to low levels, then why not just stop it going to the contorl unit? (The manually up and down button only work when not driving) Unfortunately, my idea may be wrong.
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Old 01-24-2014, 07:57 AM   #11
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Originally Posted by PetrolBear View Post
Search for SSP243 with Google. Pdf doc, insidie is the wiring diagram.
As far as I know you in MY2004 no manual mode is present. You can choose manual mode by pressing up or down for a few seconds (only one of them! - if you trigger both, the car goes into "jack mode" deactivating the suspension contolling - only for service works).

So read through SSP243. I my point, the control strategy is genial, basically. I would not recommend to modify the system (Anyway it would emit the yellow triangle as well.)
You either have a faulty control module, or rather a wiring problem, or the control module receives a false signal from any or more of the level senders. The latter one is the most probable. Bad or noisy signals can fool the whole system. Don't you have an oil leak on the front? It can make the senders' signal noisy as far as I experienced.
Thank you.
The up and down button only work when the car is in stationary or not above certain speed limit. I am just confusing why the car can stay at certain level for days or months if there is any air leak. I didn't see obvious oil leak but a tiny drop may possibly ruin the sender's signal. The car is now at 100,000 mileage, which is a good number that will need a replacement for the air suspension unit according to what I have found online.
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Old 01-24-2014, 09:29 AM   #12
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No complaints. I just could not afford that money at this moment thus was seeking for an alternative way which makes sense to me. If the speed signal is the only factor that can bring the car to low levels, then why not just stop it going to the contorl unit? (The manually up and down button only work when not driving) Unfortunately, my idea may be wrong.
Control module not necessary to replace after 100000 mileage. You are not understand how it is working. I can explain in km/h only.
Second level is normal position. It is design.
You can up suspension level to 3rd or 4th level without moving or...
- 4th level limit till 30 km/h, after reach of speed limit suspension lowering to previous level;
- 3rd level limit till 80 km/h, same situation;
- 2nd (normal) level limit will keep till 135 km/h,
- 1st level will keep down during full stoppage.
After stopage suspension will restore 2nd level or you can stop movement manualy and keep level in 1st position.
Please read SSP243 file and compare functionality of your system. If your car doesn't drop down every morning, not necessary to finding problem itself. Do not disturb the mechanism to work.
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Old 01-24-2014, 10:01 AM   #13
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Control module not necessary to replace after 100000 mileage. You are not understand how it is working. I can explain in km/h only.
Second level is normal position. It is design.
You can up suspension level to 3rd or 4th level without moving or...
- 4th level limit till 30 km/h, after reach of speed limit suspension lowering to previous level;
- 3rd level limit till 80 km/h, same situation;
- 2nd (normal) level limit will keep till 135 km/h,
- 1st level will keep down during full stoppage.
After stopage suspension will restore 2nd level or you can stop movement manualy and keep level in 1st position.
Please read SSP243 file and compare functionality of your system. If your car doesn't drop down every morning, not necessary to finding problem itself. Do not disturb the mechanism to work.
Thanks. The main problem is that the car will not stay at level 1 but keep going down to a extremely low level during freeway driving, thus the yellow light will appear on the dash board, once this happens, the car will bump severely just like no suspension, and it won't raise to even level 1 by itself or manually, the light will flash all the time at level 1. The only will to bring it back to normal level is to drive off freeway and restart the engine. However, if I don't go to freeway, I have no problem under local driving condition.
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Old 01-24-2014, 11:49 AM   #14
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Thanks. The main problem is that the car will not stay at level 1 but keep going down to a extremely low level during freeway driving, thus the yellow light will appear on the dash board, once this happens, the car will bump severely just like no suspension, and it won't raise to even level 1 by itself or manually, the light will flash all the time at level 1. The only will to bring it back to normal level is to drive off freeway and restart the engine. However, if I don't go to freeway, I have no problem under local driving condition.
Sounds like your air suspension module is done. If you cut the right wire to disable speed reading to the module, I suspect it will shut down the system and will be inoperable. Only so long you can drive before the system releases all air (it will happen eventually).

Try finding another used module. Bryan @ audis4parts.com may have some for a decent price.
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Old 01-24-2014, 12:22 PM   #15
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"The main problem is that the car will not stay at level 1 but keep going down to a extremely low level during freeway driving, thus the yellow light will appear on the dash board, once this happens, the car will bump severely just like no suspension, and it won't raise to even level 1 by itself or manually, the light will flash all the time at level 1. The only will to bring it back to normal level is to drive off freeway and restart the engine. "

Sounds interesting!
Question: all four corner exceeds level 1 or only 1-2 corner/s?

In case only the front two ones drop down (which is hardly to recognize and differ from all four corner whilst driving by 130km/h) it is simply about leaking air bags on the front. When I bought my car the same happened at the driveway. In manual mode I switched to Level 1 at 120. In my a** some kind of tdi something was pushing from the back. Then I gave full throttle, in some seconds exceeding 100 mph and leaving the TDI ritter stranded... then the wheels hit some pothole. Result: due to springing in, the (anyway existing) leaky point opened up for a moment and I lost the nose level because the pump was unable to refill at such pace. I parked out, waited and could hardly pump up (big leaks on both).

Just test it again to be sure.
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Old 01-24-2014, 01:07 PM   #16
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Originally Posted by PetrolBear View Post
"The main problem is that the car will not stay at level 1 but keep going down to a extremely low level during freeway driving, thus the yellow light will appear on the dash board, once this happens, the car will bump severely just like no suspension, and it won't raise to even level 1 by itself or manually, the light will flash all the time at level 1. The only will to bring it back to normal level is to drive off freeway and restart the engine. "

Sounds interesting!
Question: all four corner exceeds level 1 or only 1-2 corner/s?

In case only the front two ones drop down (which is hardly to recognize and differ from all four corner whilst driving by 130km/h) it is simply about leaking air bags on the front. When I bought my car the same happened at the driveway. In manual mode I switched to Level 1 at 120. In my a** some kind of tdi something was pushing from the back. Then I gave full throttle, in some seconds exceeding 100 mph and leaving the TDI ritter stranded... then the wheels hit some pothole. Result: due to springing in, the (anyway existing) leaky point opened up for a moment and I lost the nose level because the pump was unable to refill at such pace. I parked out, waited and could hardly pump up (big leaks on both).

Just test it again to be sure.
The front part drop lower than the rear part when that happens. I guess the small leaks in the two front air springs will become important at high speed so that it cannot sustain the car body while it does in stationary. It this true, removing speed input signal may not help.
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Old 01-24-2014, 01:13 PM   #17
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Sounds like your air suspension module is done. If you cut the right wire to disable speed reading to the module, I suspect it will shut down the system and will be inoperable. Only so long you can drive before the system releases all air (it will happen eventually).

Try finding another used module. Bryan @ audis4parts.com may have some for a decent price.
I think the control module is still good. I did't cut it until yesterday, and the car seemed stronger than when the wire was not cut, it stayed at level 2 (dropped from level 3) for a relatively long time until I purposely increased the speed to about 80 MPH. Two possibilities are: having cut wrong wire or the leaks become severer at this speed.
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Old 01-24-2014, 02:05 PM   #18
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Air leak does not depend on speed but does depend on level. Basically, at level 1 and 2 is worse than is 3. In case it drops any corner or nose at level 1, it can still hold the 2 and the 3, or if drops the nose from L2 overnight, parkint at L3 stays OK for days. It is connected with the rubber air bag folding in structure (see some pictures about - link socks folding in each other) Leaks happen mostly at the height on which the car moved to most. Usually level 1 and 2.
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Old 01-24-2014, 10:51 PM   #19
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The front part drop lower than the rear part when that happens. I guess the small leaks in the two front air springs will become important at high speed so that it cannot sustain the car body while it does in stationary. It this true, removing speed input signal may not help.
Sorry for my English! But 'll try!
I've understood your issue. Problem is humidity and dirt inside pneumatic valve module installed near air compressor and issue come when temperature outside near of "0" degrees by celsius.
You need to provide "deep maintenence". Remove air compressor and overhauling drier-filter. It is containing silicagel inside. Impregnated of water it is working like restrictor for compressor. New silicagel would be nice but anneal also possible.
Second step - necessary to add pneumatics antifreeze Wabco in a pneumatic reciever which installed left side of laggage compartment. Antifreeze can help you to dry system inside.
Also would be better if you soak valve module in antifreeze.
If problem doesn't neglected long time all listed operation can help restore working condition.
I've expirience on previous Allroad with same operations. It was restore condition of air suspension, but I've requested new valve module and replaced it after two months.
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Old 01-24-2014, 11:28 PM   #20
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The front part drop lower than the rear part when that happens.
This phrase is the same diagnose which I had in past.
It is your root cause
http://www.jimellisaudiparts.com/pro...4F0616013.html
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Old 01-24-2014, 11:28 PM
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