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Thread: A8 D3 Air Suspension Dramas, HELP!!!

  1. Default A8 D3 Air Suspension Dramas, HELP!!!

    Hi Guys,

    I've got a problem. The suspension has gone into 'safe' mode (low and rock hard with the amber light on).

    So far I've checked:
    Compressor - OK
    Relay - OK
    Fuse - OK
    Front height sensors - OK
    Right rear height sensor - No ground and only measures ~3v on the supply line..? I'll check the left rear in a minute, but I've got a feeling either a plug is loose or one of the control modules has a problem. Does anyone know where the control module(s) is located?

  2. #2

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    Are you able to hook the car up to diagnostics to see what the fault code is?

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    Quote Originally Posted by Alister View Post
    Are you able to hook the car up to diagnostics to see what the fault code is?
    I can't read the code, 'can't communicate with module' or something like that, but I have a feeling the problem is the right rear level sensor. Is the control module under the driver's seat? I wiggled a few wires under there and got a ground again and +5v on the supply line, but nothing on the signal line...

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    @Alister, just our of interest, what is the best scanner to buy for an A8 in your opinion. I've gotten away with a $30 ebay scanner for Engine, ABS, A/T, and Airbag for years, and I run VCDS lite with a 327 chipped USB cable for more in-depth stuff, but the A8 is very picky and often won't talk to VCDS lite. I know, you get what you pay for...

  5. #5
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    full vcds/cagcom cable seems to be the best way to go... $400 or so if you can find them, and worth every penny in my mind... (no subscription either!)

  6. The Following User Says Thank You to jnrdavo For This Useful Post:

    aji72 (January 22nd, 2018)

  7. #6

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    I have a genuine Ross-Tech HEX+CAN USB cable. IMO this is the best option for a D3 A8.

  8. The Following User Says Thank You to Alister For This Useful Post:

    aji72 (January 22nd, 2018)

  9. #7

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    Quote Originally Posted by Alister View Post
    I have a genuine Ross-Tech HEX+CAN USB cable. IMO this is the best option for a D3 A8.
    +1 ^

    OBD eleven is getting some good reviews too and has a functionality set to rival VCDS.

    VCDS is the established player in the VAG world though, to the point that a lot of VAG independant shops use it.
    Marty




    ---
    Current:
    2001 S8 - 19" x 9" C5 RS6 rims, Solar Sunroof, heated leather front and rear seats, tinted side and rear glass, RNS-D, XCarlink, Bose, clunky old phone in arm rest...
    2002 S8 - 18" RS4 reps (for now), Solar Sunroof, 'Sports' mode shifter... Engine dropped valve on PO - work in progress...

    Gone but not forgotten:
    ​1997 A4 Quattro V6 Manual "Hamilton's Club Sport"

  10. #8

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    Quote Originally Posted by Alister View Post
    I have a genuine Ross-Tech HEX+CAN USB cable. IMO this is the best option for a D3 A8.
    Plus 1. I did get an email advising that the software wasn't going to be updated further than ver 17 as the USB was being superseded but I downloaded ver 18 the other day following Ross Tech links for the Hex + CAN USB.
    B5 RS4 : Lightly modified -- C5 2.7 allroad -- B5 A4 1.8 quattro 132 Kw -- UNIMOG 404 TLF8

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    Okay, I took a punt and went OBDeleven. It arrived today and I have to say it's pretty easy to use!

    The report is:
    ------------
    34 Ride Control System

    System description: LUFTFDR.-CDC H05
    Software number: 4E0910553E
    Software version: 4290
    Hardware number: 4E0907553E
    Coding: 0015510

    Trouble codes:
    00668 - Vehicle voltage terminal 30 Open circuit/short circuit to ground
    static
    ----
    So, the system isn't getting power. Weird, because I've checked the fuse and relay and they both work. It's gotta be a connector. Does anyone know where the control module is located? Under the drivers seat perhaps????

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