UK-POLOS.NET - THE VW Polo Forum

Posted: **Mon Mar 30, 2026 10:26 am**

Hi everyone, I’m looking for some advice regarding an issue after a BCM upgrade on my 2013 VW Polo 6R (TSI).

VW Polo 6R (TSI) 2013 with:

Factory Bi-Xenons - without auto-lights

Auto-dimming mirror

Rain sensor

Cruise Control

Panoramic Sunroof

DSG Transmission

The Upgrade:
I upgraded my BCM from 7H0 937 090 B to 7E0 937 090 to gain CAN Gateway support for a 5F unit. The installation was a direct "plug and play" swap with no changes made to the physical wiring. I transferred the coding from the original BCM and CAN Gateway to the new ones and successfully adapted the remote key fobs. An expansion/autoscan via VCDS shows no fault codes both before and after the swap.

VCDS Autoscan before swap (OLD BCM 7H0 937 090 B):

Code: Select all

Saturday,28,March,2026,14:12:10:16365
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 25.3.1.1  HEX-V2 CB: 0.4671.4
Data version: 20250415 DS365.0
www.Ross-Tech.com


VIN: WVWZZZ6RZEY086625   License Plate: 


Chassis Type: 6R-VW25 (6N0)
Scan: 01 02 03 04 08 09 10 15 17 19 25 44 55 56

VIN: WVWZZZ6RZEY086625   Mileage: 107880km-67033miles

01-Engine -- Status: OK 0000
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
04-Steering Angle -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: OK 0000
10-Park/Steer Assist -- Status: OK 0000
15-Airbags -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: OK 0000
25-Immobilizer -- Status: OK 0000
44-Steering Assist -- Status: OK 0000
55-Headlight Range -- Status: OK 0000
56-Radio -- Status: OK 0000
-------------------------------------------------------------------------------
Address 01: Engine (J623-CBZB)       Labels:. 03F-906-070-CBZ.clb
   Part No SW: 03F 906 070 HF    HW: 03F 907 309 AJ
   Component: SIMOS10.22AH10 5489  
   Revision: --H10---    Serial number:                CVN: 16B39E57
   Coding: 002500D6202400080000
   Shop #: WSC 00788 648 00255
   ASAM Dataset: EV_ECM12TFS02103F906070HF 004008
   ROD: EV_ECM12TFS02103F906070FD_004.rod
   VCID: 6D87C9A91D1200B254C-8038
   VINID: 9E69EAAAA1A2A95A402061821421720D6C

No fault code found.
Readiness: 0000 0000

-------------------------------------------------------------------------------
Address 02: Auto Trans        Labels: 0AM-927-769.clb
   Part No SW: 0AM 300 058 G    HW: 0AM 927 769 D
   Component: GSG DSG AG7     431 4530  
   Revision: 00043014    Serial number: CU501309066146
   Coding: 0000020
   Shop #: WSC 00788 648 00255
   VCID: 353721C9395288726CC-5132

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes (J104)       Labels:. 6R0-907-37x-ESP90.clb
   Part No SW: 6R0 907 379 AS    HW: 6R0 907 379 AS
   Component: ESP9.0i front H03 0003  
   Serial number: --------------
   Coding: 21DD4885412B00C6841A126B825600400905
   Shop #: WSC 01383 785 00200
   ASAM Dataset: EV_Brake1ESP90iBOSCH 003020
   ROD: EV_Brake1ESP90iBOSCH_003_VW23.rod
   VCID: 0F7BB32177DE92A2060-805A

No fault code found.

-------------------------------------------------------------------------------
Address 04: Steering Angle (G085)       Labels:* 6R0-959-654.clb
   Part No SW: 6R0 959 654     HW: 6R0 959 654 
   Component: LENKW.SENSOR  H07 0070  
   Serial number: 06091304652341
   Coding: 01
   Shop #: WSC 00000 000 00000
   ASAM Dataset: EV_LWSKLOVW25X 005001
   ROD: EV_LWSKLOVW25X.rod
   VCID: 7EA5FEE540748B2AFD6-802A

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC (J255)       Labels: 6R0-907-044.clb
   Part No SW: 6R0 907 044 H    HW: 6R0 907 044 H
   Component: Climatronic   H12 0812  
   Revision: V0000000    
   VCID: 382928FD2250751A77A-806C

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect. (J519)       Labels:. 7H0-937-08x-09.clb
   Part No SW: 7H0 937 090 B    HW: 7H0 937 090 
   Component: BCM PQ25 Max4 H74 0712  
   Revision: B9074001    Serial number: 0571 245131617
   Coding: 64B02BBF08A10000093809916C2B0FD05AC0472F60051040200000030000
   Shop #: WSC 124697 483 00190
   VCID: 2D0709A9DD12C0B214C-8078

   Subsystem 1 - Part No: 1K0 955 559 AH  Labels: 1K0-955-559-AG.CLB
   Component: RLS 230813 05  54  0403 
   Coding: 02302D

   Subsystem 2 - Part No SW: 6R0 959 801 AT    HW: 6R0 959 801 AT  Labels: 6R0-959-801.CLB
   Component: J386__TSG_FT  003 8611 
   Serial number: KU0KU026081300017047
   Coding: 0000A0

   Subsystem 3 - Part No SW: 6R0 959 802 BE    HW: 6R0 959 802 BE  Labels: 6R0-959-802.CLB
   Component: J387__TSG_BT  003 8611 
   Serial number: KU0KU026081300012708
   Coding: 1000A0

   Subsystem 4 - Part No SW: 6R0 959 591 B    HW: 6R0 959 591 B
   Component: J245 PS72.023  H02 0007 
   Serial number:     WOO23339464     
   Coding: 081001

   Subsystem 5 - Part No SW: 5K0 959 542 C    HW: 5K0 959 542 C
   Component: E221__MFL-TAS  H31 0037 
   Serial number: 0192441             
   Coding: 020000

   Subsystem 6 - Part No SW: 6R0 959 811 N    HW: 6R0 959 811 N
   Component: J388__TSG_HL  003 8610 
   Serial number: KU0KU027081300016080
   Coding: 0000A0

   Subsystem 7 - Part No SW: 6R0 959 812 N    HW: 6R0 959 812 N
   Component: J389__TSG_HR  003 8610 
   Serial number: KU0KU027081300017803
   Coding: 1000A0

No fault code found.

-------------------------------------------------------------------------------
Address 10: Park/Steer Assist (J446)       Labels:| 6R0-919-475.clb
   Part No SW: 6R0 919 475 C    HW: 7E0 919 475 
   Component: PARKHILFE 4K  H11 0013  
   Revision: --------    Serial number: 47331323401708
   Coding: 108101
   Shop #: WSC 00788 648 00255
   ASAM Dataset: EV_VW250ParkiAssis2 S01008
   ROD: EV_VW250ParkiAssis2.rod
   VCID: 3E253EE500F44B2ABD6-806A

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags (J234)       Labels:| 5K0-959-655.clb
   Part No SW: 6R0 959 655 K    HW: 6R0 959 655 K
   Component: VW10Airbag01M H10 0020  
   Revision: --------    Serial number: 003GX01UZEBE Dataset Number: v00305696R0 0001
   Coding: 00314D
   Shop #: WSC 01383 785 00200
   ASAM Dataset: EV_AirbaVW10BPAVW250 A01001
   ROD: EV_AirbaVW10BPAVW250.rod
   VCID: 4ACD62354C3CF78A11E-801E

   Crash sensor for side airbag: driver side: 
   Serial number: 3575HRB400O50HUABI2O

   Crash sensor for side airbag: passenger side: 
   Serial number: 3585HRB405N22BUK6GF 

   Rear Side Airbag Crash Sensor (on driver's side): 
   Serial number: 3515RRB400M50LKOFHG8

   Passenger side rear thorax airbag crash sensor: 
   Serial number: 3525RRB401I50LASLHLB

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments (J285)       Labels:| 5K0-920-xxx-17.clb-SRI1
   Part No SW: 6R0 920 860 M    HW: 6R0 920 860 M
   Component: KOMBI         H04 0709  
   Serial number: 00000000000000
   Coding: 140E01
   Shop #: WSC 00788 648 00255
   ASAM Dataset: EV_Kombi_UDS_VDD_RM09 A04723
   ROD: EV_Kombi_UDS_VDD_RM09_004_VW23.rod
   VCID: 3E253EE500F44B2ABD6-806A

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway (J533)       Labels:. 6N0-909-901-6R.clb
   Part No SW: 6N0 909 901     HW: 7H0 937 090 
   Component: GW-K-CAN TP20 H74 0712  
   Revision: B9074001    
   Coding: 002200
   Shop #: WSC 124697 483 00190
   VCID: 70B9D0DD0AA0ED5A7FA-8024

No fault code found.

-------------------------------------------------------------------------------
Address 25: Immobilizer (J334)       Labels:| 5K0-920-xxx-25.clb
   Part No SW: 5K0 953 234     HW: 5K0 953 234 
   Component: IMMO          H04 0709  
   Serial number:               
   Coding: 000000
   Shop #: WSC 00000 000 00000
   ASAM Dataset: EV_Immo_UDS_VDD_RM09 A03710
   ROD: EV_Immo_UDS_VDD_RM09_VW23.rod
   VCID: 6A8DC2B52CFC178A31E-803E

No fault code found.

-------------------------------------------------------------------------------
Address 44: Steering Assist
Cannot be reached

-------------------------------------------------------------------------------
Address 55: Headlight Range (J431)       Labels:. 6R0-907-357.clb
   Part No SW: 6R0 907 357     HW: 6R0 907 357 
   Component: LWR-ECU       H02 0070  
   Revision: --------    Serial number: -------------- Dataset Number: 6R0036v____ 0005
   Coding: 0112000001000000
   Shop #: WSC 00788 648 00255
   ASAM Dataset: EV_HeadlRegulVWLWRPt 001004
   ROD: EV_HeadlRegulVWLWRPt_VW25.rod
   VCID: 77ABEBC16F4EBA62BE0-8022

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio (J503)       Labels:. 5M0-035-1xx-56.clb
   Part No SW: 3C8 035 195 F    HW: 3C8 035 195 F
   Component: RCD510        H04 5019  
   Revision: -----22S    Serial number: VWZ4Z3N1138988
   Coding: 05000400020001
   Shop #: WSC 00788 648 00255
   VCID: 2B0307B1E306CE820A8-807E

No fault code found.

End----------(Elapsed Time: 02:01, VBatt start/end: 12.0V/12.0V)-----------
---------------------------No fault code found.----------------------------

VCDS Autoscan after swap (NEW BCM 7E0 937 090):

Code: Select all

Monday,30,March,2026,03:08:53:16365
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 25.3.1.1  HEX-V2 CB: 0.4671.4
Data version: 20250415 DS365.0
www.Ross-Tech.com


VIN: WVWZZZ6RZEY086625   License Plate: 


Chassis Type: 6R-VW25 (7E0)
Scan: 01 02 03 04 08 09 10 15 17 19 25 44 55 56

VIN: WVWZZZ6RZEY086625   Mileage: 107880km-67033miles

01-Engine -- Status: OK 0000
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
04-Steering Angle -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: OK 0000
10-Park/Steer Assist -- Status: OK 0000
15-Airbags -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: OK 0000
25-Immobilizer -- Status: OK 0000
44-Steering Assist -- Status: OK 0000
55-Headlight Range -- Status: OK 0000
56-Radio -- Status: OK 0000
-------------------------------------------------------------------------------
Address 01: Engine (J623-CBZB)       Labels:. 03F-906-070-CBZ.clb
   Part No SW: 03F 906 070 HF    HW: 03F 907 309 AJ
   Component: SIMOS10.22AH10 5489  
   Revision: --H10---    Serial number:                CVN: 16B39E57
   Coding: 002500D6202400080000
   Shop #: WSC 00788 648 00255
   ASAM Dataset: EV_ECM12TFS02103F906070HF 004008
   ROD: EV_ECM12TFS02103F906070FD_004.rod
   VCID: 6D87C9A91D1200B254C-8038
   VINID: 9E69EAAAA1A2A95A402061821421720D6C

No fault code found.
Readiness: 0110 0101

-------------------------------------------------------------------------------
Address 02: Auto Trans
Cannot be reached

-------------------------------------------------------------------------------
Address 03: ABS Brakes (J104)       Labels:. 6R0-907-37x-ESP90.clb
   Part No SW: 6R0 907 379 AS    HW: 6R0 907 379 AS
   Component: ESP9.0i front H03 0003  
   Serial number: --------------
   Coding: 21DD4885412B00C6841A126B825600400905
   Shop #: WSC 01383 785 00200
   ASAM Dataset: EV_Brake1ESP90iBOSCH 003020
   ROD: EV_Brake1ESP90iBOSCH_003_VW23.rod
   VCID: 0F7BB32177DE92A2060-805A

No fault code found.

-------------------------------------------------------------------------------
Address 04: Steering Angle (G085)       Labels:* 6R0-959-654.clb
   Part No SW: 6R0 959 654     HW: 6R0 959 654 
   Component: LENKW.SENSOR  H07 0070  
   Serial number: 06091304652341
   Coding: 01
   Shop #: WSC 00000 000 00000
   ASAM Dataset: EV_LWSKLOVW25X 005001
   ROD: EV_LWSKLOVW25X.rod
   VCID: 7EA5FEE540748B2AFD6-802A

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC (J255)       Labels: 6R0-907-044.clb
   Part No SW: 6R0 907 044 H    HW: 6R0 907 044 H
   Component: Climatronic   H12 0812  
   Revision: V0000000    
   VCID: 382928FD2250751A77A-806C

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect. (J519)       Labels:. 7E0-937-BCM-V1.clb
   Part No SW: 7E0 937 090     HW: 7E0 937 090 
   Component: BCM PQ25 Max4 H80 0736  
   Revision: B9080001    Serial number: 0771 020161939
   Coding: 64B02BBF08A10000093809916C2B0FD05AC0472F60051040200000030000
   Shop #: WSC 02737 022 00190
   VCID: 6889B8BD3270259A27A-803C

   Subsystem 1 - Part No: 1K0 955 559 AH  Labels: 1K0-955-559-AG.CLB
   Component: RLS 230813 05  54  0403 
   Coding: 02302D

   Subsystem 2 - Part No SW: 6R0 959 801 AT    HW: 6R0 959 801 AT  Labels: 6R0-959-801.CLB
   Component: J386__TSG_FT  003 8611 
   Serial number: KU0KU026081300017047
   Coding: 0000A0

   Subsystem 3 - Part No SW: 6R0 959 802 BE    HW: 6R0 959 802 BE  Labels: 6R0-959-802.CLB
   Component: J387__TSG_BT  003 8611 
   Serial number: KU0KU026081300012708
   Coding: 1000A0

   Subsystem 4 - Part No SW: 6R0 959 591 B    HW: 6R0 959 591 B
   Component: J245 PS72.023  H02 0007 
   Serial number:     WOO23339464     
   Coding: 081001

   Subsystem 5 - Part No SW: 5K0 959 542 C    HW: 5K0 959 542 C
   Component: E221__MFL-TAS  H31 0037 
   Serial number: 0192441             
   Coding: 020000

   Subsystem 6 - Part No SW: 6R0 959 811 N    HW: 6R0 959 811 N
   Component: J388__TSG_HL  003 8610 
   Serial number: KU0KU027081300016080
   Coding: 0000A0

   Subsystem 7 - Part No SW: 6R0 959 812 N    HW: 6R0 959 812 N
   Component: J389__TSG_HR  003 8610 
   Serial number: KU0KU027081300017803
   Coding: 1000A0

No fault code found.

-------------------------------------------------------------------------------
Address 10: Park/Steer Assist (J446)       Labels:| 6R0-919-475.clb
   Part No SW: 6R0 919 475 C    HW: 7E0 919 475 
   Component: PARKHILFE 4K  H11 0013  
   Revision: --------    Serial number: 47331323401708
   Coding: 108101
   Shop #: WSC 00788 648 00255
   ASAM Dataset: EV_VW250ParkiAssis2 S01008
   ROD: EV_VW250ParkiAssis2.rod
   VCID: 3E253EE500F44B2ABD6-806A

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags (J234)       Labels:| 5K0-959-655.clb
   Part No SW: 6R0 959 655 K    HW: 6R0 959 655 K
   Component: VW10Airbag01M H10 0020  
   Revision: --------    Serial number: 003GX01UZEBE Dataset Number: v00305696R0 0001
   Coding: 00314D
   Shop #: WSC 01383 785 00200
   ASAM Dataset: EV_AirbaVW10BPAVW250 A01001
   ROD: EV_AirbaVW10BPAVW250.rod
   VCID: 4ACD62354C3CF78A11E-801E

   Crash sensor for side airbag: driver side: 
   Serial number: 3575HRB400O50HUABI2O

   Crash sensor for side airbag: passenger side: 
   Serial number: 3585HRB405N22BUK6GF 

   Rear Side Airbag Crash Sensor (on driver's side): 
   Serial number: 3515RRB400M50LKOFHG8

   Passenger side rear thorax airbag crash sensor: 
   Serial number: 3525RRB401I50LASLHLB

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments (J285)       Labels:| 5K0-920-xxx-17.clb-SRI1
   Part No SW: 6R0 920 860 M    HW: 6R0 920 860 M
   Component: KOMBI         H04 0709  
   Serial number: 00000000000000
   Coding: 140E01
   Shop #: WSC 00788 648 00255
   ASAM Dataset: EV_Kombi_UDS_VDD_RM09 A04723
   ROD: EV_Kombi_UDS_VDD_RM09_004_VW23.rod
   VCID: 3E253EE500F44B2ABD6-806A

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway (J533)       Labels:. 7E0-909-901.clb
   Part No SW: 7E0 909 901     HW: 7E0 937 090 
   Component: GW-K-CAN TP20 H80 0736  
   Revision: B9080001    
   Coding: 002200
   Shop #: WSC 02737 022 00190
   VCID: 6889B8BD3270259A27A-803C

No fault code found.

-------------------------------------------------------------------------------
Address 25: Immobilizer (J334)       Labels:| 5K0-920-xxx-25.clb
   Part No SW: 5K0 953 234     HW: 5K0 953 234 
   Component: IMMO          H04 0709  
   Serial number:               
   Coding: 000000
   Shop #: WSC 00000 000 00000
   ASAM Dataset: EV_Immo_UDS_VDD_RM09 A03710
   ROD: EV_Immo_UDS_VDD_RM09_VW23.rod
   VCID: 6A8DC2B52CFC178A31E-803E

No fault code found.

-------------------------------------------------------------------------------
Address 44: Steering Assist
Cannot be reached

-------------------------------------------------------------------------------
Address 55: Headlight Range (J431)       Labels:. 6R0-907-357.clb
   Part No SW: 6R0 907 357     HW: 6R0 907 357 
   Component: LWR-ECU       H02 0070  
   Revision: --------    Serial number: -------------- Dataset Number: 6R0036v____ 0005
   Coding: 0112000001000000
   Shop #: WSC 00788 648 00255
   ASAM Dataset: EV_HeadlRegulVWLWRPt 001004
   ROD: EV_HeadlRegulVWLWRPt_VW25.rod
   VCID: 77ABEBC16F4EBA62BE0-8022

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio (J503)       Labels:. 5M0-035-1xx-56.clb
   Part No SW: 3C8 035 195 F    HW: 3C8 035 195 F
   Component: RCD510        H04 5019  
   Revision: -----22S    Serial number: VWZ4Z3N1138988
   Coding: 05000400020001
   Shop #: WSC 00788 648 00255
   VCID: 2B0307B1E306CE820A8-807E

No fault code found.

End----------(Elapsed Time: 01:32, VBatt start/end: 13.9V/13.8V)-----------
---------------------------No fault code found.----------------------------

The Problem:
As soon as I turn on the exterior lights, the interior backlighting (instrument cluster and all buttons) starts flickering. Interestingly, if I lower the brightness using the dimmer switch, the flickering frequency increases.
This only happens when the engine is running and the lights are on. When only the ignition is on (engine off) and lights are on, there is no flickering at all.
Does anyone know what might be causing this or if there's a specific adaptation or coding parameter I missed for the 7E0 unit in a Polo 6R?
Thanks in advance for any help!

Posted: **Mon Mar 30, 2026 11:48 am**

Hi there.
Looks like signal 58/58d conflict is going on after BCM swap. Temporarily isolate T73/b 34 wire from BCM and see if problem resolves.

Posted: **Tue Mar 31, 2026 2:25 am**

patil wrote: Mon Mar 30, 2026 11:48 am Hi there.
Looks like signal 58/58d conflict is going on after BCM swap. Temporarily isolate T73/b 34 wire from BCM and see if problem resolves.

---

lukasmarousek wrote: Mon Mar 30, 2026 10:26 am Hi everyone, I’m looking for some advice regarding an issue after a BCM upgrade on my 2013 VW Polo 6R (TSI).
...
...
...
Thanks in advance for any help!

Possible causes:
- You need to add a new 58d wire.
- If the 7E0 BCM is second-hand, some Adaptation channels may need to be modified.

Posted: **Tue Mar 31, 2026 9:03 am**

Update:
This only happens when the engine is running and the lights are on. When only the ignition is on (engine off) and lights are on, there is no flickering at all.

Temporarily isolate T73/b 34 wire from BCM and see if problem resolves.

Thanks for the advice. I'll pull this pin out of the connector tonight and let you know.

Possible causes:
- You need to add a new 58d wire.
- If the 7E0 BCM is second-hand, some Adaptation channels may need to be modified.

Thanks for the advice. New 58d wire? From the BCM to the dimmer switch ?
Yes. 7E0 BCM is second-hand from VW T6 Multivan.

Posted: **Tue Mar 31, 2026 11:07 am**

Search here...
viewtopic.php?p=516196#p516196
... and perhaps you'll find the solution yourself!

Posted: **Tue Mar 31, 2026 1:25 pm**

ciclo wrote: Tue Mar 31, 2026 11:07 am Search here...
viewtopic.php?p=516196#p516196
... and perhaps you'll find the solution yourself!

Ciclo, i am sorry, this topic is about Automatic lights, but I dont have automatic light switch. So you're saying I need to get a wiring harness for automatic lighting?

Posted: **Tue Mar 31, 2026 1:38 pm**

NO.
I only said that if you look there, you might be able to find the solution yourself.

It's very obvious to me.

---

However, it's a good time to install automatic lights. Highly recommended.

Posted: **Tue Mar 31, 2026 4:35 pm**

ciclo wrote: Tue Mar 31, 2026 1:38 pm NO.
I only said that if you look there, you might be able to find the solution yourself.

It's very obvious to me.

---

However, it's a good time to install automatic lights. Highly recommended.

OK, I think I have the solution: A new wire between Dimmer (pin T6/3) and BCM 7E0 (pin T73b/4). Could you please confirm if this is correct?

Posted: **Tue Mar 31, 2026 5:41 pm**

ciclo wrote: Tue Mar 31, 2026 2:25 am
patil wrote: Mon Mar 30, 2026 11:48 am Hi there.
Looks like signal 58/58d conflict is going on after BCM swap. Temporarily isolate T73/b 34 wire from BCM and see if problem resolves.

Underlined with red letters with a big ? mark by the master

New wire is definitely needed from BCM T73b/4 to T6/3 dimmer switch for 7E0 BCM. Even with new wire connected, flickering of buttons backlight would persist. I know this, because sometime ago, me and Amir were trying to troubleshoot the same problem of flickering in polo6r after 7H0 to 7E0 swap with factory bixenons with dimmer in EU import 6R.
Thinking of signal 58d dual input conflict happening at dimmer switch, I suggested trying to isolate t73b/34, it worked and flickering stopped. Or is it supposed to be T73b/1 ?
I know there are so many electrical variants of 6R , you know better than any one of us and explain us with your exhaustive knowledge and experience

Posted: **Tue Mar 31, 2026 7:26 pm**

For now

... I can only tell you that the BCM needs to know what's happening with signal 58d/58 so it can manage it 'according to instructions'.
T73b/34 is the 58'd' BCM's input signal, so removing it isn't the best course of action.

Posted: **Wed Apr 01, 2026 3:36 am**

Sometimes, people living in parallel universes

use the blue/grey wire (signal 58d) that goes to all the switches to power 'ACME' brand control units for interior neon lights or other parallel circumstances... This is not right.
The correct thing to do would be to use this 58d signal to activate a relay with a +30 supply for that parallel universe. Even VW does this (see T6 diagrams).
Speaking of our dear friend Amir, I remember that a long time ago I made him an interior lighting system similar to this one for his 6R TSI.

I'm going to have to have a serious talk with Amir, since we are currently in contact with similar circumstances for a friend's 6R.

In the 7E0 BCM Max, it is possible to replicate that flickering of the interior lights on an adaptation channel (other than APK 45) by changing the assigned/'instructed' value.
The channel number is suggestive/exciting.

Logic does not allow for ambiguity.
It is absurd to omit parallel universes to the masters of this or any other universe.

Posted: **Wed Apr 01, 2026 8:00 am**

ciclo wrote: Wed Apr 01, 2026 3:36 am The channel number is suggestive/exciting.

Is it 69 by any chance?

Posted: **Wed Apr 01, 2026 8:40 am**

That one or some nearby channel, I don't remember exactly... I checked it a long time ago, I suppose everyone should test it personally as it can give different results.

Now, from memory, I only know the more than 2500 BCM adaptation channels of the Golf and some of Porsche.

Posted: **Wed Apr 01, 2026 9:57 am**

patil wrote: Mon Mar 30, 2026 11:48 am Hi there.
Looks like signal 58/58d conflict is going on after BCM swap. Temporarily isolate T73/b 34 wire from BCM and see if problem resolves.

When I disconnect wire T73b/34, the flickering of the instrument cluster backlight and all buttons stops. However, the dimmer wheel now only adjusts the interior button illumination; it no longer affects the backlight for the instrument cluster, radio, or Climatronic.

Posted: **Wed Apr 01, 2026 11:32 am**

Exactly, and that's why the T73b/34 needs to be connected.

Install the wire you discovered yourself. T73b/4 --- T6/3 (1.0mm2).

Take a reading of the BCM's adaptation channels and upload it to a server so we can access it.
https://drive.google.com/drive/folders/ ... sp=sharing

UK-POLOS.NET - THE VW Polo Forum

BCM upgrade from 7H0 to 7E0, flickering instrument cluster and all buttons

BCM upgrade from 7H0 to 7E0, flickering instrument cluster and all buttons

Re: BCM upgrade from 7E0 to 7H0, flickering instrument cluster and all buttons

Re: BCM upgrade from 7H0 to 7E0, flickering instrument cluster and all buttons

Re: BCM upgrade from 7H0 to 7E0, flickering instrument cluster and all buttons

Re: BCM upgrade from 7H0 to 7E0, flickering instrument cluster and all buttons

Re: BCM upgrade from 7H0 to 7E0, flickering instrument cluster and all buttons

Re: BCM upgrade from 7H0 to 7E0, flickering instrument cluster and all buttons

Re: BCM upgrade from 7H0 to 7E0, flickering instrument cluster and all buttons

Re: BCM upgrade from 7H0 to 7E0, flickering instrument cluster and all buttons

Re: BCM upgrade from 7H0 to 7E0, flickering instrument cluster and all buttons

Re: BCM upgrade from 7H0 to 7E0, flickering instrument cluster and all buttons

Re: BCM upgrade from 7H0 to 7E0, flickering instrument cluster and all buttons

Re: BCM upgrade from 7H0 to 7E0, flickering instrument cluster and all buttons

Re: BCM upgrade from 7E0 to 7H0, flickering instrument cluster and all buttons

Re: BCM upgrade from 7H0 to 7E0, flickering instrument cluster and all buttons