Audi A3 (8L) battery drain

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R

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Hi,
I have another car that is driving me quietly mad!
2001 A3 (8P) UK model, with a battery drain of around 280mA.
The conditions to set the problem are an ignition on/off cycle. When the battery is freshly connected, no problem with around a 22mA drain. Cycle the ignition on and off and the drain increases to around 280mA and stays there whether its locked or not. if the battery is disconnected the fault goes away until the key is cycled again.
Removing fuse 15 in the passenger compartment fusebox drops the drain to around 8mA. That fuse is marked instrument cluster and autobox (this car is a manual).
I thought it might be the alarm horn H12, TPS (the VAG parts supply in UK) said the horn is in the windscreen scuttle but it isn't. Looking behind the sub-woofer in the boot I can't see one but there is a 3-pin connector there that is unused although the cable appears a little short.
There appear to be several references on the internet about a similar drain on fuse 15 but no definitive answers.
Code: 
Tuesday,05,March,2019,14:51:54:20505
VCDS -- Windows Based VAG/VAS Emulator Running on Windows Vista x86
VCDS Version: 18.9.1.0
Data version: 20190114 DS296.0
www.Ross-Tech.com

Dealer/Shop Name: Response Diagnostics     01732 863344

VIN: WAUZZZ8L92A040216   License Plate: FG51XNX
Mileage: 135593   Repair Order: 



--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


Chassis Type: 8L (8L - Audi A3/S3 (1997 > 2005))
Scan: 01 02 03 08 15 16 17 22 35 37 45 55 56 57 75 76
 
VIN: WAUZZZ8L92A040216   
-------------------------------------------------------------------------------
Address 01: Engine        Labels: None
   Part No: 06A 906 032 EE
   Component: 1.8L R4/5VS MOTR    0001  
   Coding: 10500
   Shop #: WSC 06435  
   VCID: 65C58DC5FF31DF624E-5120
   WAUZZZ8L92A040216     AUZ5Z0A8120083

5 Faults Found:
18010 - Power Supply Terminal 30 
            P1602 - 35-10 - Voltage too Low - Intermittent
16711 - Knock Sensor 1 (G61) 
            P0327 - 35-10 - Signal too Low - Intermittent
17852 - Potentiometer for EGR (G212) 
            P1444 - 35-10 - Implausible Signal - Intermittent
16795 - Secondary Air Injection System 
            P0411 - 35-10 - Incorrect Flow Detected - Intermittent
17544 - Fuel Trim: Bank 1 (Add) 
            P1136 - 35-00 - System too Lean
Readiness: 0000 0000

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 1C0-907-37x-ESP-F.lbl
   Part No: 1C0 907 379 E
   Component: ESP FRONT MK60      0104  
   Coding: 0011266
   Shop #: WSC 06435 000 00000
   VCID: 2C5338E18C5B2E2A51-513C

1 Fault Found:
00668 - Supply Voltage Terminal 30 
            008 - Implausible Signal - Intermittent

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: Redir Fail!
   Part No: 8L0 820 043 H
   Component: A3  KLIMAAUTOMAT   0105  
   Coding: 00041
   Shop #: WSC 06435  
   VCID: 2D5535E5E741272246-2578

1 Fault Found:
01582 - Signal for Coolant Temperature 
            30-00 - Open or Short to Plus

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 8L0-959-655-AI8.lbl
   Part No: 8L0 959 655 J
   Component: Airbag Front+Seite 5008  
   Coding: 01104
   Shop #: WSC 06435  
   VCID: 45856D455FF1FF62AE-515A

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 8L0-920-xxx-17.lbl
   Part No: 8L0 920 950 E
   Component: KOMBI+WEGFAHRS. M73 D02  
   Coding: 00442
   Shop #: WSC 00000  
   VCID: 326F2699FE7F78DA1B-4B00
   WAUZZZ8L92A040216     AUZ5Z0A8120083

1 Fault Found:
00668 - Supply Voltage Terminal 30 
            53-10 - Supply Voltage Too Low - Intermittent

-------------------------------------------------------------------------------
Address 35: Centr. Locks        Labels:. 8D0-862-257.lbl
   Part No: 8D0 862 257 E
   Component: CV-Pump, Alarm, RC  D17  
   Coding: 15178
   Shop #: WSC 06435  
   VCID: 2F692FEDED4D553274-4F02

9 Faults Found:
01367 - Central Locking Pump Run Time Exceeded (Likely Leak) 
            35-00 -  - 
01371 - Alarm triggered by Door Contact Switch; Driver's Side 
            35-00 -  - 
01374 - Alarm triggered by Terminal 15 
            35-00 -  - 
01370 - Alarm triggered by Interior Monitoring 
            35-00 -  - 
01366 - Opened Due to Crash Signal 
            35-00 -  - 
01365 - Lock/Unlock Switch; Interior 
            29-00 - Short to Ground
00991 - Interior Lights 
            28-00 - Short to Plus
00955 - Key 1 
            09-00 - Adaptation Limit Surpassed
01134 - Alarm Horn (H12) 
            49-00 - No Communications

-------------------------------------------------------------------------------
Address 45: Inter. Monitor        Labels: 4B0-951-173.lbl
   Part No: 4B0 951 173 
   Component: Innenraumueberw.    D03  
   Coding: 00001
   Shop #: WSC 00000  
   VCID: 60CB9CD1E013BA4ABD-4B00

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio        Labels: 8E0-035-1xx-56.lbl
   Part No: 8E0 035 186 J
   Component: concert II  GRO    0008  
   Coding: 01001
   Shop #: WSC 63251  
   VCID: 2E5732E9EA475C3A7F-4B00

2 Faults Found:
00858 - Connection; Radio Intermediate Frequency (IF) Output to Antenna Amplifier 
            36-00 - Open Circuit
01305 - Databus for Infotainment 
            49-10 - No Communications - Intermittent

End-------------------------(Elapsed Time: 03:57)--------------------------
Any ideas?
 
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Dana

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Hi,

This VIN decrypts to the older (Mk4 Golf based A3 that sadly never made it here) 8L chassis:

Vehicle Identification No. WAUZZZ8L92A040216
Model Audi A3 1,8
A3
Date of production 12.11.2001
Year 2002
Sales type 8L1CD4
Engine Code APG
Transmission Code EGV​

Not a big deal if that was an error, however if the scan is from another car please let us know so we don't give you mislead you!

Fuse S15 powers a A50 splice labeled "Positive connection (30as), in dash panel wiring harness" before heading towards the cluster and powering T32/23 (blue 32 pin connector at the cluster, terminal 23). Because the cluster is also the CAN gateway in this car type - it is entirely possible the cluster is to blame for the key cycle behavior but I'm troubled by the A50 splice and anything it powers.

Searching A50 in all diagrams for this car directed me to G85's power in the Electronic stability program From model year 2000 diagram. It makes an appearance in several Auto trans diagrams as well but that isn't installed so we can scratch it off of the suspect list.

I suppose I'd unplug the G85 sensor to see if the draw is still present. If that doesn't resolve it you can unplug the cluster but tread lightly if that fixes it. Something else may be keeping the cluster awake and those are difficult to diagnose if you don't have spare parts to plug in and re-test with.
 
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Jack@European_Parts

Jack@European_Parts

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01365 - Lock/Unlock Switch; Interior
29-00 - Short to Ground
00991 - Interior Lights
28-00 - Short to Plus
Click to expand...


Alternator regulator D+ back feed to cluster area faulty or loose ground under battery box?

Faulty open zone in door jam wiring broken at chafe point causing car no sleep mode?
 
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Dana

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P.S. Ouch, A50 also makes an appearance in the Central locking system with interior lights switch-off delay and anti-theft alarm system with interior monitoring From model year 2002 diagram where it powers J347 - Ultra-sonic sensor control unit. You might want to unplug 45 and if 35 is one of those old vac pumps in a rear quarter panel that fills with water it might not hurt to get it offline at some point as well since it has so many DTCs.
 
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R

Response Diagnostics

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How the hell did I manage that! Yes it’s an 8L I either typo’d or it was because I was reading an 8P thread just before. I’m at home now but thanks for the info, I’ll check in the morning.
 
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Dana

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No worries. I tweaked the subject line to 8L but left the contents of post #1 alone.

I was fixated on the fuse in question but Jack's Alternator, Grounds and Fuse panel under the hood suggestions are worth ruling out before you go digging and unplugging 17, 45, 35, etc. Essentially anything connected to the cluster could be causing it to draw and that includes the Alternator.
 
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