Adaptive Cruise not working - ACC and Audi Brake Guard Not Available

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04-11-2017, 04:52 PM

john6205

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Adaptive Cruise not working - ACC and Audi Brake Guard Not Available

I posted how to remove my rear bumper, and was asked by a forum member how I diagnosed the problem, so I thought I'd start a new thread, and perhaps get a DIY going on the fix.

My 2013 A8L is stock and has no history of accident -- I have owned it about 1 yr. I took a road trip this past weekend, and in the middle of it, Cruise Control and Lane Assist stopped working. When I got home I scanned w/ VCDS and found these faults:

Code:

Address 13: Auto Dist. Reg (J428)       Labels: 4H0-907-561.clb
   Part No SW: 4H0 907 561 B    HW: 4H0 907 561 
   Component: ACC3          H17 0400  
   Serial number: 00000000000000
   Coding: 7E01020101
   Shop #: WSC 02313 785 00200
   ASAM Dataset: EV_AdaptCruisContrAU64X 002021
   ROD: EV_AdaptCruisContrAU64X_002.rod
   VCID: 2A0E0B9F6C79CF2753D-807E

1 Fault Found:
145152 - Function Restriction due to Faults in Other Modules 
          U1113 00 [009] - -
          Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 6
                    Fault Frequency: 1
                    Reset counter: 109
                    Mileage: 89594 km
                    Date: 2017.04.07
                    Time: 12:44:42

                    Control Module temperature: 17 °C
                    Voltage terminal 15: 14.511 V
                    Velocity_vehicle_reference: 31.03 m/s
                    Longitudinal_acceleration_vehicle_reference: 0.00 m/s²

and this:

Address 3C: Lane Change        Labels: Redir Fail!
   Part No SW: 4H0 907 566 A    HW: 4G0 907 566 
   Component: J769  SWA MasterH02 0040  
   Revision: 00H02000    Serial number: 6PZ 010 287-07
   Coding: 0000002
   Shop #: WSC 02313 785 00200
   VCID: 2E06078F5C11A3078F5-807A

   Subsystem 1 - Part No: 4H0 907 568 A
   Component: J770  SWA Slave H02 0040

   Subsystem 2 - Serial number: 6PZ 010 287-27

   Subsystem 3 - Serial number: 5F09.10.1200H02000AMS14105ÿ

   Subsystem 4 - Serial number: S14105ÿ

1 Fault Found:
16365 - Control Module - Electrical Error; CPU 2 
            014 - Defective
             Freeze Frame:
                    Fault Status: 01101110
                    Fault Priority: 3
                    Fault Frequency: 1
                    Reset counter: 109
                    Mileage: 0 km
                    Time Indication: 0
                    Date: 2012.01.01
                    Time: 00:00:00

and this:

Address 8B: Adaptive Cruise 2 (J428)       Labels: 4H0-907-561.clb
   Part No SW: 4H0 907 541 B    HW: 4H0 907 541 
   Component: ACC3          H17 0400  
   Serial number: 00000000000000
   Coding: 7E01020101
   Shop #: WSC 02313 785 00200
   ASAM Dataset: EV_AdaptCruisContr2AU64X 002018
   ROD: EV_AdaptCruisContr2AU57X_002.rod
   VCID: 280AF1977275FD37459-807C

1 Fault Found:
145152 - Function Restriction due to Faults in Other Modules 
          U1113 00 [009] - -
          Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 6
                    Fault Frequency: 1
                    Reset counter: 109
                    Mileage: 89594 km
                    Date: 2017.04.07
                    Time: 12:44:42

                    Control Module temperature: 16 °C
                    Voltage terminal 15: 14.490 V
                    Velocity_vehicle_reference: 30.07 m/s
                    Longitudinal_acceleration_vehicle_reference: -0.02 m/s²

So, I believe that the Adaptive Cruise modules are fine, but are being restricted from working correctly due to a bad lane change electronic module (Part No: 4H0 907 568 A) that is preventing the Adaptive Cruise Control from working -- Is this correct?

It appears to me that it is the drivers side module located behind the rear bumper is the one that has a defective CPU. Any one else seen this before?

So, I believe removing the rear bumper and replacing the module is the answer.

I was hoping someone else has seen this and can comment???