D4 dead flat battery - help please

[paulrstaylor]

Be careful. My D4 had a dead battery in December after an extended stay in the garage, Audi assist diagnosed it was dead (~2v) and jumped it to get me home.

The next day the supplying dealer agreed to replace, but as they were a distance away and it was the week before Christmas agreed to pay a more local dealer to do the work. They were useless and never got in touch, and so with the agreement of the original dealer I bought a battery form Halfords and fitted it myself.

All was well, the car starts again. But for some time after I have had a number of electrical gremlins, after much trouble shooting including factory support the current thinking is that the battery needed coding and they couldn't do so with non-OEM, they replaced the battery again and now are going to replace the BCM (batter control module) as they suspect that is at fault (possibly from the jump start by Audi assist!?).

For reference, the dealer quote for a replacement battery fitted and coded was £300 - so twice the supply only cost of the battery, but possibly a small price to pay for piece of mind!?

Edited to say - not much info on coding a D4 battery I could find last year, suspect it is similar to the D3 but not the same!

[mondie]

Thanks for the advice Paul, especially the bit about not being able to code to new the battery and needing to buy another. How ridiculous is that! I am glad that I havent jumped the car, its stuck on my drive so there's not much Audi can do for me at this point either.

Prices for a replacement battery vary wildly, this seems to be the best deal but I have never heard of Enduroline. No doubt a rebrand as this is rife in the battery market like many others.

https://www.tayna.co.uk/019-Enduroli...CCA-P8385.html

Staying with OEM this is the best I can find

https://www.tayna.co.uk/Type-019-Var...ery-P3127.html

This is all a bit messy. ECP has 3 or 4 batteries but they are more than double the price and same spec/warranty, I cannot work out the difference.

[paulrstaylor]

No problem - notionally this was the right size for mine, I will have a spare when I get the car back as without the coding my car had issues!!!!!

I suspect coding would have been possible using VCDS, but as it was warranty work I have left them to fit a genuine Audi part

[mondie]

can anyone decipher the difference between these two Varta's, one claims to be for stop-start but the spec of it is lower. Is this just marketing as I cannot see how there is any real difference.

https://www.tayna.co.uk/Type-019-Var...ery-P3127.html

https://www.tayna.co.uk/G14-Varta-St...085-P8424.html

The cheaper battery has better specs.

why would I pay £220 for this (less 30%)

http://www.eurocarparts.com/ecp/c/Au...a39e64f&000020

[paulrstaylor]

The more expensive one is an AGM battery, which is used on stop-start cars. If your current one isn't AGM, I'd stick with the standard type

[mondie]

The car has start-stop (it's always off though) and I guess has an AGM, all 3 I posted above are AGM although the Varta Silver Dynamic does not promote it. Hence why I am confused, is this all just marketing BS or am I missing something obvious. All of the batterys I have found are slightly smaller in width than the factory battery too.

[mondie]

God this is a ball ache.

From tonight's reading, I have found that to code the new battery to the car you need a battery with a BEM code. Guess who sells them, yep Audi and no one else So screw that.

This is what I will buy tomorrow once I have verified the dims one last time, its the closest I can find to what's in the car.

https://www.tayna.co.uk/610-200-Vart...92--P3200.html

Apparently if you don't recode the car after a new battery 2 things can happen.

1) Possibly shorter battery life but this is probably just a scare from Audi.

2) The cars electrics may not function correctly until the car has learnt that the battery is strong. As mine died overnight I assume the ECU has a stored a depleted battery status and the only way for the car to learn it has a new battery is by using the car, starting it over and over etc so it learns and begins to reactivate systems that are shut down to preserve battery power.

Wonder if that's why you experienced issues with your new battery Peter?

Cheers

[funkmiester]

What the hell am i doing on a 3 year old thread? Well it's the same car, I bought from Mondie, last May and it has been brilliant other than getting the rear diff done and some new front discs/pads.

Issue battery is emptying itself in about 5 hours. That's a hell of rate.

Started last week, dead overnight, thought it was unusual but hey, it's winter and was below zero last week.
Charged it back to health off the car. Drained again overnight.
The battery was the one Mondie installed at the end of this thread the silver varta. I was stuck and figured 3 years is a bit short of life so I went round to Halfrauds and bought a 019 AGM 95AH (Halfrauds brand Yausa) for the Ouch of £184 but it has a 5 year guarantee so we'll see.
Knowing what fun coding can be so I bought to a OBDeleven Pro for £99 and have been impressed so far.

What is currently happening with the car is:
Power Off take key out (press the internal alarm off so i can sit in the car and watch)
Powers down as normal then:
Various relays click inside and out (don't know where, traffic noise ouside car)
Parking light red (P) on dash lights with the P on the gear selector and the red parking brake light.
20-30 seconds later
Parking light and gearbox goes out
A pump runs under the bonnet for 20 seconds(don't know what but suspect this is what the big battery drain is)
Then the parking brake light goes out and then 20 seconds later the whole cycle starts again.

Car runs/drives fine, just won't go to sleep.

I did several full dumps with OBD Eleven. I even swapped out the 3 door handle sensors just in case it was that (Mondie had provided replacements but I had never been bothered before, done now, no difference)
Main errors from the dump below:
1) There is also no communication with the Battery control module, either it failed before? or I broke it swapping out the battery (possible but unlikely). I've ordered a new one just in case. And yes the yellow/purplish cable is correctly installed on the negative terminal/BECM

No 19 Gateway has 3
U105000 - Battery monitoring control module No Communication
U104900 - Optical data bus Open circuit
U011200 - Lost Communication With Battery Energy Control Module "B"
static

So I await the new BECM but it might not be that. I know Mondie had the parking brake switch replaced (I have the old one as well) and the fact this weird cycle starts and ends with the parking brake suggests it might be a faulty switch (again). And what is with the optical data bus open circuit?

I'll try disconnecting the parking brake switch tomorrow and see if the cycle continues but I suspect that will just throw up different errors.

Many thanks for reading so far, thoughts welcome.

Here is the full
OBDeleven data log

Date: 2019-11-24 14:15

VIN: WAUZZZ4H2AN003873
Car: Audi A8
Year: 2010
Body type: Saloon
Engine: CDSB 258 kW (351 HP) 4.2 l
Mileage: 132070 KM

---------------------------------------------------------------
01 Engine Control Module 1

System description: 4.2TDI EDC17
Software number: 4H0907409
Software version: 0010
Hardware number: 4H0907409
Hardware version: H04
ODX name: EV_ECM42TDI1114H0907409
ODX version: 001016
Long coding: 0106002C290F0268

Trouble codes:
No trouble codes found

---------------------------------------------------------------
02 Transmission Control Module

System description: 0BL 42 TDIRdW
Software number: 4H1927158Q
Software version: 1008
Hardware number: 0BL927156E
Hardware version: H08
ODX name: EV_TCMALX51011
ODX version: 001013
Long coding: 001111

Trouble codes:
No trouble codes found

---------------------------------------------------------------
03 Brakes 1

System description: ESP PREMIUM
Software number: 4H0907379A
Software version: 0151
Hardware number: 4H0907379A
Hardware version: H08
Serial number: --------------
ODX name: EV_ESPPremi
ODX version: 004012
Long coding: E4EAA20027574500E300

Trouble codes:
No trouble codes found

---------------------------------------------------------------
04 Steering Angle Sender


Trouble codes:
No trouble codes found

---------------------------------------------------------------
05 Kessy

System description: BCM2 2.0
Software number: 4H0907064DB
Software version: 0510
Hardware number: 4H0907064L
Hardware version: H13
Long coding: 05170001000000000000

Subsystems:
System description: FBSAUDID4 IDG
Software number: 4H0959754DD
Software version: 0083
Hardware version: H71
Serial number: 0815000116280013

System description: J764 ELV MLB
Software number: 4H0905852A
Software version: 0042
Hardware version: H37
Serial number: 0210000036533003

Trouble codes:
No trouble codes found

---------------------------------------------------------------
06 Seat Adjustment Passenger Side

System description: MEM-BFS
Software number: 4H0959760D
Software version: 0115
Hardware number: 4H0959760D
Hardware version: H07
Serial number: 00001010115765
Long coding: 0038320000043201000001010101112131313333283333

Trouble codes:
No trouble codes found

---------------------------------------------------------------
08 Air Conditioning

System description: Klima 4 Zonen
Software number: 4H0820043D
Software version: 0040
Hardware number: 4H0820043D
Hardware version: H12
ODX name: EV_AirCondiFront
ODX version: 001048
Long coding: 386100BE0C

Trouble codes:
No trouble codes found

---------------------------------------------------------------
09 Central Electrics

System description: BCM1 2.0
Software number: 4H0907063G
Software version: 0092
Hardware number: 4H0907063
Hardware version: H09
Serial number: 00000000446251
Long coding: 0907201009749FE1AB810007A0001800009DC30A8B00012180 0108542F00

Subsystems:
System description: WWS641 100218
Software number: 4H2955119C
Software version: 0040
Hardware version: H32
Serial number: 100223010130
Long coding: 0045F7

System description: RLS
Software number: 8K0955559
Software version: 0003
Hardware version: H04
Serial number: 10866911
Long coding: 025D5B

System description: E1 - LDS
Software number: 4H0941531B
Software version: 0044
Hardware version: H07
Serial number: 07 04 2010 00000037

System description: EHL2 V07.03
Software number: 4H0907410
Software version: 0020
Hardware version: H30
Serial number: 0000001805568R05A505

System description: A31 LED Mod1L
Software number: 4H0907472A
Software version: 0002
Hardware version: H01
Serial number: 000000-0000-0000
Long coding: 100000

System description: A27 LED Mod1R
Software number: 4H0907472A
Software version: 0002
Hardware version: H01
Serial number: 000000-0000-0000
Long coding: 100000

System description: EVLS-SG
Software number: 4H0907705H
Software version: 0275
Hardware version: H08
Serial number: WA091314000000029837
Long coding: 020300

System description: AQ_Hum_Sensor
Software number: 4H0907658
Software version: 0002
Hardware version: H02
Serial number: F3080B15000000000001

Trouble codes:
No trouble codes found

---------------------------------------------------------------
10 Parking Assistance 2

System description: PARKHILFE ACC
Software number: 4H0919475C
Software version: 0011
Hardware number: 4H0919475C
Hardware version: H05
Serial number: 44831011006265
ODX name: EV_AU64XParkiAssis2
ODX version: 005003
Long coding: 300902

Trouble codes:
No trouble codes found

---------------------------------------------------------------
11 Engine Control Module 2

System description: 4.2TDI EDC17
Software number: 4H0907409
Software version: 0010
Hardware number: 4H0907409
Hardware version: H04
ODX name: EV_ECM42TDI2114H0907409
ODX version: 001016
Long coding: 0106002C290F0268

Trouble codes:
No trouble codes found

---------------------------------------------------------------
13 Adaptive Cruise Control

System description: ACC3
Software number: 4H0907561A
Software version: 0160
Hardware number: 4H0907561
Hardware version: H15
Serial number: 00000000000000
ODX name: EV_AdaptCruisContrAU64X
ODX version: 001012
Long coding: 3404010201

Trouble codes:
No trouble codes found

---------------------------------------------------------------
15 Airbag

System description: Airbag10.43
Software number: 4H0959655B
Software version: 0026
Hardware number: 4H0959655B
Hardware version: H22
Serial number: 003G10011PW-
ODX name: EV_AirbaAU10BPAAU64X
ODX version: 001014
Long coding: 30314246304230303037554A305234483053

Trouble codes:
No trouble codes found

---------------------------------------------------------------
16 Steering Column Electronics

System description: Lenks.Modul
Software number: 4H0953568A
Software version: 0007
Hardware number: 4H0953568A
Hardware version: H07
Serial number: 90815IKQ0000J
Long coding: 0000BC

Subsystems:
System description: E221 - MFL
Software number: 4H0951528
Software version: 0009
Hardware version: H04
Serial number: 01 03 2010 33005292

Trouble codes:
No trouble codes found

---------------------------------------------------------------
17 Dash Board

System description: TDieGBACC----
Software number: 4H0920950A
Software version: 0185
Hardware number: 4H0920950A
Hardware version: H30
Serial number: 6580305105930160�
ODX name: EV_RBD4K
ODX version: 004033
Long coding: 33060800D7002600010000

Subsystems:
System description: Analoguhr D4
Software number: 4H0919204F
Software version: 0210
Hardware version: H04
Serial number: 1100417001054

Trouble codes:
No trouble codes found

---------------------------------------------------------------
19 Gateway

System description: J533--Gateway
Software number: 4H0907468F
Software version: 0213
Hardware number: 4H0907468C
Hardware version: H07
Serial number: 00000000014345
ODX name: EV_GatewUDS
ODX version: 001025
Long coding: 00C1037D00

Subsystems:
System description: J367-BDM
Software number: 4H0915181
Software version: 0130
Hardware version: H07
Serial number: 00000000005640101407

Trouble codes:
U105000 - Battery monitoring control module No Communication
Intermittent
Date: 2019-11-21 00:33:10
Mileage: 132070 km
Priority: 2
Malfunction frequency counter: 1
Unlearning counter: 248
Voltage terminal 30: 14.5 V
Voltage terminal 15: 14.4 V
Control module temperature: 22 °C
System status: Terminal 15 on
Terminal 15 status: On
Terminal 15 status via CAN: On
IN ZAS_Kl_X: On
Engine running: On
IN ESP_Stillstandsflag: standstill detected
Datenfeld: 0
U104900 - Optical data bus Open circuit
Intermittent
Date: 2019-11-21 01:12:21
Mileage: 132070 km
Priority: 2
Malfunction frequency counter: 1
Unlearning counter: 248
Voltage terminal 30: 11.9 V
Voltage terminal 15: 0.0 V
Control module temperature: 27 °C
System status: Awake_Timer_active
Terminal 15 status: Off
Terminal 15 status via CAN: Off
IN ZAS_Kl_X: Off
Engine running: Off
IN ESP_Stillstandsflag: standstill detected
Datenfeld: 0
U011200 - Lost Communication With Battery Energy Control Module "B"
static


---------------------------------------------------------------
20 High Beam Assistance

System description: FLA
Software number: 8K0857511E
Software version: 0004
Hardware number: 8K0857511E
Hardware version: H04
Long coding: 04028B646E6E645A5A253D3E

Trouble codes:
No trouble codes found

---------------------------------------------------------------
22 All Wheel Control

System description: 4 Wheel Drive
Software number: 4H0907163
Software version: 0005
Hardware number: 4H0907163
Hardware version: H11
Serial number: 0012041000010713
ODX name: EV_AllWheelDiffeQSPFR
ODX version: 003017

Trouble codes:
No trouble codes found

---------------------------------------------------------------
28 Climate Control Unit Rear

System description: Klima Fond
Software number: 4H0919158D
Software version: 0040
Hardware number: 4H0919158D
Hardware version: H11
ODX name: EV_AirCondiHeck
ODX version: 001038
Long coding: 0800000000

Trouble codes:
No trouble codes found

---------------------------------------------------------------
30 Special Function 2

System description: STS
Software number: 4H0907440
Software version: 0020
Hardware number: 4H0907440
Hardware version: H06
Serial number: 00000000003669
Long coding: 01010101000000000000000202

Trouble codes:
No trouble codes found

---------------------------------------------------------------
34 Ride Control System

System description: LUFE-DAEMPFER
Software number: 4H0907553B
Software version: 0095
Hardware number: 4H0907553
Hardware version: H16
Serial number: �‡0�€
ODX name: EV_AirSuspe
ODX version: 003017
Long coding: 008002

Trouble codes:
No trouble codes found

---------------------------------------------------------------
36 Seat Adjustment Driver Side

System description: MEM-FS
Software number: 4H0959760D
Software version: 0115
Hardware number: 4H0959760D
Hardware version: H07
Serial number: 00001010115805
Long coding: 00383B0000053201000001010101112131313333203333

Trouble codes:
No trouble codes found

---------------------------------------------------------------
3B Sensor Electronics

System description: SARA 6D red
Software number: 4H0907637A
Software version: 0015
Hardware number: 4H0907637A
Hardware version: H02
Serial number: EJ1BPA37003GK00000000000
ODX name: EV_SARA
ODX version: 006014

Trouble codes:
No trouble codes found

---------------------------------------------------------------
42 Door Electronics Driver Side

System description: TSG FA
Software number: 4H0959793E
Software version: 0158
Hardware number: 4H0959793E
Hardware version: H02
Serial number: 0000103409803
Long coding: 011F1E215E2162C202000007

Trouble codes:
No trouble codes found

---------------------------------------------------------------
46 Central Module Comfort System

System description: BCM2 2.0
Software number: 4H0907064DB
Software version: 0510
Hardware number: 4H0907064L
Hardware version: H13
Serial number: 0129711341
Long coding: 011B0E2200397D85BB2007F28E000000000000000000000000 0000000000

Subsystems:
System description: GTO BF
Software number: 4H0959719
Software version: 0070
Hardware version: H01
Serial number: 00000000000000002453

System description: DWA-Sensor
Software number: 4H0951177
Software version: 0010
Hardware version: H01

System description: LIN BACKUP HO
Software number: 1K0951605C
Software version: 1501
Hardware version: H05

System description: J245 PS50.028
Software number: 4H0959591
Software version: 0006
Hardware version: H06
Serial number: WOO10009QT$
Long coding: 001F00

System description: J505-FSH
Software number: 4H0907133A
Software version: 0045
Hardware version: H06
Serial number: 00000000000000000477

System description: Dachelektroni
Software number: 4H0947135K
Software version: 0070
Hardware version: H11
Serial number: A2010000000000073713
Long coding: 010000

System description: V252 PS009
Software number: 4H0959591A
Software version: 0004
Hardware version: H05
Serial number: WOO10002OWX

Trouble codes:
No trouble codes found

---------------------------------------------------------------
47 Sound System

System description: BO G3 D4
Software number: 4H0035465A
Software version: 0150
Hardware number: 4H0035465
Hardware version: H06
Serial number: 0010277

Subsystems:
System description: BO D4 SLAVE
Software number: 4H0035466
Software version: 0180
Hardware version: H51
Serial number: 00302100000429

Trouble codes:
No trouble codes found

---------------------------------------------------------------
52 Door Electronics Passenger Side

System description: TSG BF
Software number: 4H0959792E
Software version: 0158
Hardware number: 4H0959792E
Hardware version: H02
Serial number: 0000103565148
Long coding: 011F1E215E2162C202000007

Trouble codes:
No trouble codes found

---------------------------------------------------------------
53 Parking Brake

System description: EPB-4
Software number: 4H0907801C
Software version: 0009
Hardware number: 4H0907801A
Hardware version: H03
Serial number: 00000000001772
ODX name: EV_ParkiBrake
ODX version: 001015

Trouble codes:
No trouble codes found

---------------------------------------------------------------
56 Radio

System description: Radio U DAB
Software number: 4E0035061L
Software version: 0085
Hardware number: 4E0035061
Hardware version: H46
Serial number: 014CR0A7504809
Long coding: 010103010000000001

Trouble codes:
03455 - Function limitation due to received malfunction value
Intermittent
Priority: 6
Frequency counter: 1
Driving cycle: 248
Mileage: 132070 km
Date: 2019-11-21 00:32:38


---------------------------------------------------------------
57 TV Tuner

System description: HybridTV-DVB
Software number: 4F0919129G
Software version: 0550
Hardware number: 4F0919129
Hardware version: H07
Serial number: 76301300189001
Long coding: 03010000

Trouble codes:
No trouble codes found

---------------------------------------------------------------
5F Information Control Unit 1

System description: H-BNT-EU
Software number: 4H0035670L
Software version: 0637
Hardware number: 4H0035670
Hardware version: H48
Serial number: 410DV0A7554736
Long coding: 020101000001F9EF6D128B1E00000003000001000000000000

Subsystems:
System description: ECE 2013
Software number: 8R0060884AR
Software version: 1505

System description: DU8 D4 SV NB
Software number: 4H0919604B
Software version: 0021
Hardware version: H44
Serial number: AUZ8ZDA110038WE

System description: E380 BDT D4
Software number: 4H2919600H
Software version: 0065
Hardware version: H09
Serial number: 00000000007461

System description: CD-Database
Software number: 8R0060961
Software version: 1886

Trouble codes:
02067 - Optical data bus unauthorized awakening request
Intermittent


---------------------------------------------------------------
62 Door Electronics Rear Left

System description: TSG HL
Software number: 4H0959795A
Software version: 0158
Hardware number: 4H0959795A
Hardware version: H04
Serial number: 0000103566105
Long coding: 010F1E21402162C202000007

Trouble codes:
No trouble codes found

---------------------------------------------------------------
6C Camera System Rear View

System description: SG Rueckfahrkamera
Software number: 4H0907441
Software version: 0030
Hardware number: 4H0907441
Serial number: 525PA8-J03D0D3
Coding: 1022002

Trouble codes:
No trouble codes found

---------------------------------------------------------------
6D Deck Lid Control Unit

System description: HDSG-Modul
Software number: 4H0959107F
Software version: 0632
Hardware number: 4H0959107F
Hardware version: H11
Serial number: 103000015
ODX name: EV_DeckLidContrUnit
ODX version: 001023
Long coding: 0200044000

Trouble codes:
No trouble codes found

---------------------------------------------------------------
6F Central Module Comfort System 2

System description: ALM
Software number: 4H0907412
Software version: 0004
Hardware number: 4H0907412
Hardware version: H05
Serial number: 000000004905
ODX name: EV_Ambie
ODX version: 001008
Long coding: 020000

Trouble codes:
No trouble codes found

---------------------------------------------------------------
72 Door Electronics Rear Right

System description: TSG HR
Software number: 4H0959795A
Software version: 0158
Hardware number: 4H0959795A
Hardware version: H04
Serial number: 0000103566096
Long coding: 010F1E21402162C202000007

Trouble codes:
No trouble codes found

---------------------------------------------------------------
81 Gear Shift Control Module

System description: GSM-RL
Software number: 4H2927731
Software version: 0083
Hardware number: 4H2927731
Hardware version: H07
Serial number: SN100317 0079
ODX name: EV_GSM2x3Mono
ODX version: 001017

Trouble codes:
No trouble codes found

---------------------------------------------------------------
85 On-Board Camera

System description: DPC-SG
Software number: 4H0907217A
Software version: 0016
Hardware number: 4H0907217A
Hardware version: H20
Serial number: 26213002542100000000010089
ODX name: EV_OnBoardCamerDPC
ODX version: 001007
Long coding: E9040000

Trouble codes:
No trouble codes found

---------------------------------------------------------------
88 Multi Contour Seat Driver Side

System description: IVB
Software number: 4H0907182C
Software version: 0027
Hardware number: 4H0907182C
Hardware version: H03
Serial number: 00449500005501
ODX name: EV_IVBDriveSideFrnt
ODX version: 001003
Long coding: 670FF2

Trouble codes:
No trouble codes found

---------------------------------------------------------------
89 Multi Contour Seat Passenger Side

System description: IVB
Software number: 4H0907182C
Software version: 0027
Hardware number: 4H0907182C
Hardware version: H03
Serial number: 00448453180901
ODX name: EV_IVBPasseSideFrnt
ODX version: 001003
Long coding: 270FF2

Trouble codes:
No trouble codes found

---------------------------------------------------------------
8B Adaptive Cruise Control 2

System description: ACC3
Software number: 4H0907541A
Software version: 0160
Hardware number: 4H0907541
Hardware version: H15
Serial number: 00000000000000
ODX name: EV_AdaptCruisContr2AU64X
ODX version: 001010
Long coding: 3404010201

Trouble codes:
No trouble codes found

---------------------------------------------------------------
8C Battery Energy Control Module


Trouble codes:
No trouble codes found

---------------------------------------------------------------
8E Image Processing Electronics

System description: BV-SG
Software number: 4H0907107
Software version: 0008
Hardware number: 4H0907107
Hardware version: H25
Serial number: 00004005190310769100460000
ODX name: EV_BVS
ODX version: 001007
Long coding: 01A28200

Trouble codes:
No trouble codes found

---------------------------------------------------------------
8F Pretensioner Front Left

System description: RGS-VL
Software number: 4H0980945
Software version: 0060
Hardware number: 4H0980945
Hardware version: H04
ODX name: EV_RGS_L
ODX version: 002006
Long coding: 00660600031F037E000308004248D2000000

Trouble codes:
No trouble codes found

---------------------------------------------------------------
90 Pretensioner Front Right

System description: RGS-VR
Software number: 4H0980946
Software version: 0060
Hardware number: 4H0980946
Hardware version: H04
ODX name: EV_RGS_R
ODX version: 002006
Long coding: 00660600031F037E000308004248D2000000

Trouble codes:
No trouble codes found

[steamship]

Originally Posted by funkmiester

What is currently happening with the car is:
Power Off take key out (press the internal alarm off so i can sit in the car and watch)
Powers down as normal then:
Various relays click inside and out (don't know where, traffic noise ouside car)
Parking light red (P) on dash lights with the P on the gear selector and the red parking brake light.
20-30 seconds later
Parking light and gearbox goes out
A pump runs under the bonnet for 20 seconds(don't know what but suspect this is what the big battery drain is)
Then the parking brake light goes out and then 20 seconds later the whole cycle starts again.
.
.
.
.
I'll try disconnecting the parking brake switch tomorrow and see if the cycle continues but I suspect that will just throw up different errors.

Not familiar with the D4 so just guesswork. Before you disconnect the parking brake switch, could you watch it again but with the parking brake not set (assuming the car is parked on a level surface) to see if the behaviour changes. If it does, then the switch would be the culprit.

[Architex_mA8tey]

I had an issue with a D4 where we though it was the parking brake switch and indeed replaced it, and a couple of months later the same issue occured of the electronic parking brake not releasing. Fortunately I had Vagcom with me and was able to tell the handbrake to release itself!
On further investigation it turned out to be loose wiring / connections where the wiring harness went into the brake module in the LH side behind the boot trim. This was sorted out and all has been fine since - worth a check in case you are getting intermittent connections causing issues