Battery drain issue with A3 8p

[Matias262]

Hello.

I've got a problem with my A3 8p, model year 2005. Everything seems to work properly, but if the car stands for a few days in my garage, its battery drains so empty that the car isn't able to start. Actually nothing seems to power up in the car, not even any warning lights etc. This means that the battery must be disconnected at all times when the car is not being driven. Only suspicious thing in the car is the red triangle-shaped hazard flasher button in the middle of the dashboard, which stays on even if the car is locked and all the lights are turned off

I made an auto scan with VCDS software, and i got the codes below. Some advice for solving my problem would be extremely helpful, because the car can't be used in daily driving due its current condition.

VCDS autoscan:
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Chassis Type: 8P (1K0)
Scan: 01 03 08 09 15 16 17 19 25 42 44 46 47 52 56 62 72

VIN: WAUZZZ8PX5A078500 Mileage: 215710km/134035miles

00-Steering Angle Sensor -- Status: OK 0000
01-Engine -- Status: OK 0000
03-ABS Brakes -- Status: Malfunction 0010
08-Auto HVAC -- Status: Malfunction 0010
09-Cent. Elect. -- Status: OK 0000
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: Malfunction 0010
25-Immobilizer -- Status: OK 0000
42-Door Elect, Driver -- Status: OK 0000
44-Steering Assist -- Status: OK 0000
46-Central Conv. -- Status: Malfunction 0010
47-Sound System -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
56-Radio -- Status: OK 0000
62-Door, Rear Left -- Status: Malfunction 0010
72-Door, Rear Right -- Status: OK 0000

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Address 01: Engine Labels: 06A-906-033-BGU.lbl
Part No: 06A 906 033 DS
Component: SIMOS71 1.6l 2V 6206
Revision: --H04--- Serial number: AUX7Z0D9FNT08A
Coding: 0000071
Shop #: WSC 06314 000 00000
VCID: 73E5394E12152586991-8026

No fault code found.
Readiness: 1110 1101

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Address 03: ABS Brakes Labels: 1K0-907-379-MK60-F.lbl
Part No: 1K0 907 379 K
Component: ESP FRONT MK60 0104
Coding: 0019077
Shop #: WSC 06435 000 00000
VCID: 3A7BD46A75FF94CE9A7-806F

2 Faults Found:
00668 - Supply Voltage Terminal 30
001 - Upper Limit Exceeded - Intermittent
00668 - Supply Voltage Terminal 30
002 - Lower Limit Exceeded - Intermittent

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Address 08: Auto HVAC Labels: 8P0-820-043.lbl
Part No SW: 8P0 820 043 E HW: 8P0 820 043 E
Component: KlimavollautomatH13 0150
Revision: 033449 Serial number: 8P0820043E
Shop #: WSC 06314 000 00000
VCID: 2E53E83AB9B7486E36F-807B

1 Fault Found:
01333 - Door Control Module; Rear Left (J388)
004 - No Signal/Communication - Intermittent
Freeze Frame:
Fault Status: 00100100
Fault Priority: 3
Fault Frequency: 2
Reset counter: 97
Mileage: 215662 km
Time Indication: 0
Date: 2018.05.22
Time: 00:59:20

Freeze Frame:
ON


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Address 09: Cent. Elect. Labels: 8P0-907-279-23-H.lbl
Part No SW: 8P0 907 279 C HW: 8P0 907 279 C
Component: Bordnetz-SG H34 0301
Revision: 00H34000 Serial number: 00000001191563
Coding: 088C4F029014100000160000160000000000FA0F5C
Shop #: WSC 00000 000 00000
VCID: 3D71DF7664D1A3F6BF5-8068

Subsystem 1 - Part No: 8P1 955 119 B Labels: 1KX-955-119.CLB
Component: Wischer AU350 H01 0130
Coding: 00062736
Shop #: WSC 00000

No fault code found.

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Address 15: Airbags Labels: 8P0-959-655-94.lbl
Part No SW: 8P0 959 655 C HW: 8P0 959 655 C
Component: Airbag 9.41 H10 2620
Revision: 91H10262 Serial number: 00362000YJ5Q
Coding: 0033622
Shop #: WSC 06314 000 00000
VCID: 428BAC8A1D2FDC0EC27-8017

Subsystem 1 - Serial number: 6332DRB400DD1094N

Subsystem 2 - Serial number: 6342DRB400DD9311O

Subsystem 3 - Serial number: 63528RB4002DA668P

Subsystem 4 - Serial number: 63628RB4002E8A56Q

Subsystem 5 - Serial number: 63729RB4002D98ED%

Subsystem 6 - Serial number: 63829RB4002D9AFB1

No fault code found.

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Address 16: Steering wheel Labels: 1K0-953-549-MY8.lbl
Part No SW: 1K0 953 549 HW: 1K0 953 549
Component: Lenksäulenmodul 012 0030
Coding: 0000002
Shop #: WSC 06314 000 00000
VCID: EFEDB53EFE3D8166FD9-80BA

No fault code found.

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Address 17: Instruments Labels: 8P0-920-xxx-17-MY7.lbl
Part No SW: 8P0 920 900 J HW: 8P0 920 900 J
Component: KOMBIINSTR. VDO H73 0300
Revision: D04 Serial number: 1249DD04000895
Coding: 0004103
Shop #: WSC 00001 001 00001
VCID: 3663C05A41E770AE7EF-8063

No fault code found.

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Address 19: CAN Gateway Labels: 1K0-907-530-V1.clb
Part No SW: 1K0 907 530 D HW: 1K0 907 951
Component: Gateway H08 0100
Revision: 08 Serial number: 2500104A050A32
Coding: 3D3F0342072102
Shop #: WSC 06314 000 00000
VCID: 285F1E229B53165EFC3-807D

1 Fault Found:
00470 - Combination comfort Databus in Single Wire
011 - Open Circuit
Freeze Frame:
Fault Status: 01101011
Fault Priority: 3
Fault Frequency: 1
Reset counter: 57
Mileage: 215716 km
Time Indication: 0
Date: 2018.05.24
Time: 00:12:04


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Address 25: Immobilizer Labels: 1K0-920-xxx-25.clb
Part No SW: 8P0 920 900 J HW: 8P0 920 900 J
Component: KOMBIINSTR. VDO H73 0300
Revision: D04 Serial number: AUX7Z0D9FNT08A
Shop #: WSC 00000 000 00000
VCID: 3663C05A41E770AE7EF-8063

No fault code found.

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Address 42: Door Elect, Driver Labels: 8P0-959-801-MIN2.lbl
Part No: 8P0 959 801 H
Component: Tuer-SG 020 0090
Coding: 0000176
Shop #: WSC 00477 210 01865
VCID: 408FA6821323CE1ED43-8015

No fault code found.

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Address 44: Steering Assist Labels: 1Kx-909-14x-44.clb
Part No: 1K1 909 144 G
Component: EPS_ZFLS Kl.9 1401
Shop #: WSC 00000 000 00000
VCID: 2F6DF53EBEBD41663D9-807A

No fault code found.

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Address 46: Central Conv. Labels: 8P0-959-433.lbl
Part No: 8P0 959 433 J
Component: KSG H11 0080
Coding: 1880202002186D088505488FC637
Shop #: WSC 02391 210 01865
VCID: 4385A98E0235D506C91-8016

Subsystem 1 - Component: Sounder No Answer

Subsystem 2 - Component: NGS No Answer

Subsystem 3 - Component: IRUE No Answer

4 Faults Found:
01135 - Interior Monitoring Sensors
004 - No Signal/Communication
00323 - Vehicle Inclination Sensor (G384)
004 - No Signal/Communication
01134 - Alarm Horn (H12)
004 - No Signal/Communication
01403 - Glass-Break Sensors; Rear
011 - Open Circuit

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Address 47: Sound System Labels: 8Px-035-382.lbl
Part No SW: 8P4 035 382 HW: 8P4 035 382
Component: AB2 SUBWOOFERBOXH02 0160
Revision: 00001 Serial number: 10000001191109
Shop #: WSC 00000 000 00000
VCID: F1E9B346E8099796EBD-80A4

No fault code found.

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Address 52: Door Elect, Pass. Labels: 8P0-959-802-MIN1.lbl
Part No: 8P0 959 802 E
Component: Tuersteuerger. H10 0030
Coding: 0000048
Shop #: WSC 06314 000 00000
VCID: 3E73D87A69D7B8EEA6F-806B

No fault code found.

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Address 56: Radio Labels: 8P0-035-1xx-56.lbl
Part No SW: 8P0 035 186 C HW: 8P0 035 186 C
Component: concert II EU H51 0100
Revision: 01S Serial number: AUZ2Z3D1601872
Coding: 0001001
Shop #: WSC 06435 000 00000
VCID: 326BFC4AAD8F6C8E527-8067

No fault code found.

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Address 62: Door, Rear Left Labels: 8P4-959-801.lbl
Part No: 8P4 959 801 B
Component: Tuer-SG H10 0010
Coding: 0000144
Shop #: WSC 00477 210 01865
VCID: 3E73D87A69D7B8EEA6F-806B

1 Fault Found:
00934 - Electric Window Motor; Rear Left (V26)
005 - No or Incorrect Basic Setting / Adaptation - Intermittent

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Address 72: Door, Rear Right Labels: 8P4-959-802.lbl
Part No: 8P4 959 802 B
Component: Tuer-SG H10 0010
Coding: 0000144
Shop #: WSC 06314 000 00000
VCID: 3F8DA57E6EDDB1E6AD9-806A

No fault code found.

End ---------------------------------------------------------------------

[chris86vw]

Does it beep when you lock it?

I would look at the single wire mode fault from the can module.

The rear door fault in HVAC seems odd, not sure I have seen that before.


Basically it sounds like either a wiring issue, broke, or shorting, or a module (broken/shorting) is keeping the car "alive" when it is parked and locked up so it is draining the battery.


A basic draw test would be the first step after just doing a quick check of some common wiring harness failure points, like where the wires pass through the doors, that sort of thing.

[Epic-A3]

I agree, a simple clamp on amp meter will help alot. Put it around the negative cable, that will read the entire car. Get a base line for how big your drain is with all doors shut and car locked.
After that, pull 1 fuse at a time. Check the meter, if the drain has disappeared that will isolate the drain to a system, then you can tackle that area of the car until you find it. Sometimes it's very obvious, other times you may have days into it until you find it. 1 short could cause a number of faults to pop up. Electrical gremlins are a pain, I'm fighting my own as we speak.


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