Audi a4 b6 electrical

[Colby702]

So the other day my AC decided to shut off. It would only turn on with defrost on. No instrument lights on my dash worked after this but the instruments still worked. Later on that day i pulled the instrument cluster fuse. The AC worked as it should. If i out the fuse back in it would shut off and only work with defrost on.
Emergency button and AC controller stay illuminated when car is locked

That being said i replaced every single fuse on the panel and replaced the "370" relay. Issue still happens. I am at a loss and have o idea what else to do.

[Colby702]

Anyone have any insight. I replaced the instrument cluster. The singals came on 15 minutes later but stayed solid and one stayed on after the car was powered off

[KHARDa4]

Have you verified power at the compressor? What are the high and low side pressures?

[Colby702]

i have not, but recently I have lost all power to controls and the instrument fuse no longer receives power. AC is working 100% now, but I do not have wipers, cruise, headlights, night time running lights, locks, or windows. Im assuming theres a ground issue somewhere? as I stated ac is working operating 100% but there is no power at the fuse itself for the instrument cluster.

[Colby702]

Ive been searching for a wiring diagram for the fuse to see where it leads, I figure there is either a fried ground, or power at this point.

[kwilson]

Electrical portion of your ignition switch? Not too hard to change out.

[Colby702]

ive changed the whole ignition switch itself. ill have to trace the wiring to see if I can find some burnt wiring

[TimelessB6]

Bump. Having a similar issue.

[Let it snow]

Scanning your control modules for fault codes would help narrow it down. Have you noticed any water on the floor after heavy rain?

[Colby702]

vag com no longer reads it after it lost power, no water. I have checked the CCM looks brand new. the instrument cluster fuse no longer receives power

[Colby702]

Does anyone know where all the grounds are located for the fuse box? I am going in tonight to check more wiring

[MacFady]

Ive been searching for a wiring diagram

Click

[Colby702]

Soooo. I havent found a bad ground but since i cant read ccm or steering colum with my vag com. I ran it for the dashboard. Same codes i was reading prior to the complete loss of communication to steering colum and ccm.
01331
01330
00457
01320
00466
01333
01334
01332
01331

[Jonamond]

can you communicate with any other modules besides the cluster?

[Colby702]

i cant communicate with the steering module or the instrument cluster. used to be able too until recently

[Chris60M8]

What kind of voltage is the battery putting out?

[maurizio]

Here is the B6 electrical diagram:
https://ufile.io/f293fh06

[Colby702]

Just giving an update. Mechanic has said there is a total system failure (we know this) still no leads obd2 states the alternator is charging right and battery is brand new.

[EuroxS4]

Sounds like water intrusion into J393 or failure of J519. Could be either one. I would check for water under the carpet. If no water Change J519 and report back.

[Colby702]

If i was to replace either of these, as long as i pull the same part # would it be a direct swap. or is this something that will need to be coded?

[Colby702]

Just curious about j519. This is vin locked. Does a replacement need to be directly from another 1.8t or just similar year ? I have a buddy with a free vin on his rosstech. Can it be flashed and recoded through this?

[Colby702]

Here’s my autoscan

Wednesday,21,October,2020,21:16:14:00648
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 20.4.2.0 (x64) HEX-V2 CB: 0.4513.4
Data version: 20200730 DS317.0
www.Ross-Tech.com


VIN: WAULC68E54A179902 License Plate:


Chassis Type: 8E (8E - Audi A4/S4/RS4 B6/B7 (2001 > 2008))
Scan: 01 02 03 08 09 0F 11 15 16 17 18 25 36 37 45 46 55 56 57 65
67 69 75 76 77

VIN: WAULC68E54A179902 Mileage: 249290km-154901miles
-------------------------------------------------------------------------------
Address 01: Engine Labels: 06B-909-518-AMB.lbl
Part No SW: 8E0 909 518 AK HW: 8E0 909 018 A
Component: 1.8L R4/5VT G 0004
Coding: 0016711
Shop #: WSC 78391 537 435974
VCID: 79ACE43155C97A4315D-5160

4 Faults Found:
18043 - Powertrain Data Bus
P1635 - 008 - Missing Message from A/C Controller
18107 - Powertrain Data Bus
P1699 - 008 - Missing Message from Steering Wheel Electronics
17072 - ECM Power Relay Load Circuit
P0688 - 004 - Open Circuit
18010 - Power Supply Terminal 30
P1602 - 002 - Voltage too Low - Intermittent
Readiness: 0110 1101

-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 8E0-614-517.lbl
Part No: 8E0 614 517 A
Component: ABS/ESP allrad 3429
Coding: 04275
Shop #: WSC 06435
VCID: 2616FF4DF1F725BB08F-51F2

1 Fault Found:
01826 - Sensor for Steering Angle (G85); Supply Voltage Terminal 30
35-00 - -

-------------------------------------------------------------------------------
Address 08: Auto HVAC Labels: 8E0-820-043.lbl
Part No: 8E0 820 043 AC
Component: A4 Klimaautomat 1323
Coding: 00000
Shop #: WSC 63351
VCID: 629EA35DDD5F999B247-513C

6 Faults Found:
01273 - Fresh Air Blower (V2)
30-10 - Open or Short to Plus - Intermittent
01317 - Control Module in Instrument Cluster (J285)
49-00 - No Communications
01330 - Central Control Module for Central Convenience (J393)
49-00 - No Communications
00466 - Control Module for Steering Column Electronics (J527)
49-00 - No Communications
00457 - Central Electronics Control Module / BCM (J519)
49-00 - No Communications
00474 - Control Module for Immobilizer
49-00 - No Communications

-------------------------------------------------------------------------------
Address 15: Airbags Labels: 8E0-959-655-84.lbl
Part No: 8E0 959 655 K
Component: Airbag 8.4EP 1001
Coding: 0010607
Shop #: WSC 63351 000 00000
VCID: 3FD84A290B6D94736B9-5184

4 Faults Found:
01218 - Side Airbag Igniter; Passenger Side (N200)
001 - Upper Limit Exceeded - MIL ON
00588 - Airbag Igniter; Driver Side (N95)
001 - Upper Limit Exceeded - MIL ON
00532 - Supply Voltage B+
002 - Lower Limit Exceeded - Intermittent
00474 - Control Module for Immobilizer
004 - No Signal/Communication - Intermittent

-------------------------------------------------------------------------------
Address 17: Instruments Labels: 8E0-920-9xx-8E2.lbl
Part No: 8E0 920 950 P
Component: KOMBI+WEGFAHRS. RB4 D42
Coding: 01231
Shop #: WSC 02121
VCID: 36362F0D2157553BB8F-5160
WAULC68E54A179902 AUZ6Z0C0430969

12 Faults Found:
00779 - Outside Air Temp Sensor (G17)
29-00 - Short to Ground
01314 - Engine Control Module
49-10 - No Communications - Intermittent
00457 - Central Electronics Control Module / BCM (J519)
49-00 - No Communications
01330 - Central Control Module for Central Convenience (J393)
49-00 - No Communications
01331 - Door Control Module; Driver Side (J386)
49-00 - No Communications
01332 - Door Control Module; Passenger Side (J387)
49-00 - No Communications
01334 - Door Control Module; Rear Right (J389)
49-00 - No Communications
01333 - Door Control Module; Rear Left (J388)
49-00 - No Communications
00466 - Control Module for Steering Column Electronics (J527)
49-00 - No Communications
01320 - Control Module for Climatronic (J255)
49-00 - No Communications
01336 - Company Data Bus for Comfort System
37-10 - Faulty - Intermittent
01304 - Radio
49-00 - No Communications

End----(Elapsed Time: 06:12, VBatt start/end: 11.4V/11.5V. VIgn 11.5V)-----

[EuroxS4]

Still looks like water intrusion in J393 or J519 as I mentioned earlier roughly 6 months ago. Did we verify there is no water in ebox or J393 and J519?? J519 supplies power to majority of the circuits in the car J393 can take alot of those circuits down if shorted or under water as it talks to alot of system in the car including cluster ac and so on.

[Colby702]

I’ve replaced j393. No change. I’m going to buy another j519 here soon. As long as I get the same model, it should be plug and play no?