High current draw when ignition is off, drains battery.
#1
05-05-2013, 06:39 AM
High current draw when ignition is off, drains battery.
Car:
02/03 Audi A6 Avant (4B, C5) 1.8 T quattro manual trans.
Problem:
Battery goes flat over night.
Findings:
This list of fault codes looks frightening, but the information panel between the odometer and speedometer says OK. So to the unknowingly, everything seems OK.
02/03 Audi A6 Avant (4B, C5) 1.8 T quattro manual trans.
Problem:
Battery goes flat over night.
Findings:
- Battery voltage at rest, charged: 12.6V
- Alternator Charging voltage: 14.2V
- Current draw (measured via negative battery cable to negative battery terminal) when ignition is off: More than 2A.
- Excess current draw ceases when fuses 15 (Kombigerat, Klimaanlage) and 37 (Telefon, Radio) are pulled.
- When ONLY fuse 15 is pulled, the current increases is a pulsing manner, almost like when engaging the turn signal.I don't know if this is normal behaviour.
Code:
VCDS Version: Release 11.11.5 (x64)
Data version: 20121222
Sunday,05,May,2013,10:00:22:39271
Chassis Type: 4B - Audi A6 C5
Scan: 01 02 03 06 08 15 16 17 18 22 34 35 36 37 45 55 56 57 65 67
75 76 77
VIN: WAUZZZ4B83N004654 Mileage: 116150km/72172miles
-------------------------------------------------------------------------------
Address 01: Engine Labels: 06B-906-018-AWT.lbl
Part No: 4B0 906 018 DC
Component: 1.8L R4/5VT G 0001
Coding: 11702
Shop #: WSC 02325
VCID: 65C16926FFF8A130B2A
WAUZZZ4B83N004654 AUZ7Z0B2163064
1 Fault Found:
18010 - Power Supply Terminal 30
P1602 - 35-00 - Voltage too Low
Readiness: 0000 0000
-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 4B0-614-517.lbl
Part No: 4B0 614 517 H
Component: ABS/ESP allrad 1728
Coding: 06275
Shop #: WSC 00000
VCID: 26432E2AC27E6A287B0
No fault code found.
-------------------------------------------------------------------------------
Address 08: Auto HVAC Labels: 4B0-820-043-MY2.lbl
Part No: 4B0 820 043 AD
Component: A6-Klimavollautomat 0105
Coding: 00000
Shop #: WSC 02325
VCID: 5CB74CC2CCB2E0F81D4
3 Faults Found:
01592 - Air Quality Sensor (G238)
57-00 - Electric Circuit Failure
01317 - Control Module in Instrument Cluster (J285)
49-10 - No Communications - Intermittent
01206 - Signal for Duration of Ignition Off Time
27-00 - Implausible Signal
-------------------------------------------------------------------------------
Address 15: Airbags Labels: 4B0-959-655-AI84.lbl
Part No: 4B0 959 655 P
Component: Airbag 8.4EP 2002
Coding: 0000706
Shop #: WSC 02325 785 00200
VCID: 3D71E14667E8C9F00AA
3 Faults Found:
01044 - Control Module Incorrectly Coded
000 - - - Intermittent
00592 - Seat Belt Switch; Passenger (E25)
000 - - - Intermittent
00532 - Supply Voltage B+
002 - Lower Limit Exceeded - Intermittent
-------------------------------------------------------------------------------
Address 17: Instruments Labels: 4B0-920-xxx-17.lbl
Part No: 4B0 920 933 N
Component: KOMBI+WEGFAHRS. VDO D11
Coding: 00144
Shop #: WSC 00490
VCID: 2E53D60AEA8E2268830
WAUZZZ4B83N004654 AUZ7Z0B2163064
3 Faults Found:
01300 - Control Module for Navigation with CD-Rom (J401)
49-10 - No Communications - Intermittent
01304 - Radio
49-10 - No Communications - Intermittent
00668 - Supply Voltage Terminal 30
53-10 - Supply Voltage Too Low - Intermittent
-------------------------------------------------------------------------------
Address 35: Centr. Locks Labels: 4B0-962-258.lbl
Part No: 4B0 962 258 L
Component: Zentralverriegelung D37
Coding: 06721
Shop #: WSC 02325
VCID: 326BC27AFEB60688E78
5 Faults Found:
00668 - Supply Voltage Terminal 30
07-10 - Signal too Low - Intermittent
01559 - Drivers Door
58-10 - Can't Lock - Intermittent
01559 - Drivers Door
59-10 - Can't Unlock - Intermittent
01560 - Passenger Door
60-00 - Won't Safe
01559 - Drivers Door
61-10 - Won't De-Safe - Intermittent
-------------------------------------------------------------------------------
Address 37: Navigation Labels: 4B0-035-192-RNSD-37.lbl
Part No: 4B0 035 192 K
Component: RNS 4.2 H06 BNO 0102
VCID: 25412926BF78613072A
No fault code found.
-------------------------------------------------------------------------------
Address 55: Xenon Range Labels: 4Z7-907-357.lbl
Part No: 4Z7 907 357
Component: dynamische LWR D07
Coding: 00050
Shop #: WSC 02325
VCID: 040754A214827838054
1 Fault Found:
00532 - Supply Voltage B+
07-10 - Signal too Low - Intermittent
-------------------------------------------------------------------------------
Address 56: Radio Labels: 4B0-035-192-RNSD-56.lbl
Part No: 4B0 035 192 K
Component: Radio BNO 0001
Coding: 00207
Shop #: WSC 00490
VCID: 25412926BF78613072A
No fault code found.
-------------------------------------------------------------------------------
Address 57: TV Tuner Labels: 4D0-919-146.clb
Part No: 4D0 919 146 B
Component: TV Tuner H08 0805
Coding: 0000010
Shop #: WSC 02325 785 00200
VCID: 285F2012986A7C5849C
No fault code found.
End ---------------------------------------------------------------------
#2
05-28-2013, 03:10 PM
Follow-up post:
I ended up purchasing a new battery, which I installed 13th of May 2013. I deleted old fault codes and started using the car as normal. After this I have not been able to reproduce the problems as described above. Problem solved, actually. I would never have believed that an old battery would cause these kind of problems, but it seems like this actually was the case. In the future I will be less reluctant to buy a new battery when the car fails with similar symptoms...
I ended up purchasing a new battery, which I installed 13th of May 2013. I deleted old fault codes and started using the car as normal. After this I have not been able to reproduce the problems as described above. Problem solved, actually. I would never have believed that an old battery would cause these kind of problems, but it seems like this actually was the case. In the future I will be less reluctant to buy a new battery when the car fails with similar symptoms...
#3
06-09-2013, 12:08 PM
I had the same thing happen with my 1998 A6 2.8 30v. The battery was draining, tested ok. I thought it might be the hood switch, but then left it at auto parts store for a day to drain and trickle charge, it tested bad. Replaced battery, no further problems.
#4
05-24-2018, 11:08 AM
the same thing keeps happening to my battery it drains over night when the radio fuse is in. I got the battery tested yesterday and they said the battery was good but this morning I went to crank the car to go to work and the car would not start
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