2008 A6 battery regulation module freaks out

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   #1  

Wmdunk

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Hello I needed to change the request old thread died, I have a problem in the BRM module causing the TB and more to respond to the alternator spiking up and down on demand from the BRM
You can see in MVB in group 61 the dynamic-field signal is either 0% or 100% so if I unplug the single lin bus wire at alternator, everything settles down and Alt. still charges at 14.3 volts it has only set code in the BRM module, my thought is the reman alternator is doing this spiking on it's own however I don't want to throw an OEM $800 one on to test
I've put 30 miles on it so far while watching voltage and it has been spot on 14.3 and idle has been smooth.
My question is would it hurt to drive it long term with the single wire unplugged? the battery is staying at 100% according to the MMI and soooooo much smoother at idle

Code:
esday,13,December,2023,17:45:36:07787
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 11 x64
VCDS Version: 23.3.0.0 (x64)
Data version: 20230228 DS346.1
www.Ross-Tech.com


VIN: WAUDH74FX8N099861   License Plate: MIKEY
Mileage: 315600km-196104mi   Repair Order:



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


Chassis Type: 4F (4L0)
Scan: 01 02 03 05 07 08 09 0E 0F 15 16 17 19 1E 36 37 42 46 47 4F
          52 53 55 56 61 62 65 72 77

VIN: WAUDH74FX8N099861   Mileage: 315600km-196104miles

00-Steering Angle Sensor -- Status: OK 0000
01-Engine -- Status: OK 0000
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
05-Acc/Start Auth. -- Status: OK 0000
07-Control Head -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: Malfunction 0010
0E-Media Player 1 -- Status: OK 0000
0F-Digital Radio -- Status: Malfunction 0010
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: OK 0000
1E-Media Player 2 -- Status: OK 0000
36-Seat Mem. Drvr -- Status: OK 0000
37-Navigation -- Status: OK 0000
42-Door Elect, Driver -- Status: Malfunction 0010
46-Central Conv. -- Status: Malfunction 0010
47-Sound System -- Status: OK 0000
4F-Centr. Electr. II -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
53-Parking Brake -- Status: OK 0000
55-Headlight Range -- Status: OK 0000
56-Radio -- Status: Malfunction 0010
61-Battery Regul. -- Status: Malfunction 0010
62-Door, Rear Left -- Status: OK 0000
65-Tire Pressure -- Status: Malfunction 0010
72-Door, Rear Right -- Status: OK 0000
77-Telephone -- Status: OK 0000
 
-------------------------------------------------------------------------------
Address 01: Engine (AUK)       Labels:. 06E-910-559-BKH.clb
   Part No SW: 4F2 910 559 H    HW: 4F1 907 559 E
   Component: 3.2l V6 FSI         0040 
   Revision: --H21---    Serial number:               
   Coding: 01050109190F0120
   Shop #: WSC 08167 444 84451
   VCID: 3162D6A7A837311B7C-8064
   VINID: 9D1954607116A08780249206048F5642BC

No fault code found.
Readiness: 0010 0101

-------------------------------------------------------------------------------
Address 02: Auto Trans        Labels: 09L-927-760.lbl
   Part No SW: 4F5 910 156     HW: 09L 927 156 C
   Component: AG6 09L 3.2 FSI USA 0010 
   Revision: --H04---    Serial number:        4412300
   Coding: 0000002
   Shop #: WSC 02325 785 00200
   VCID: 65CA72F7AC7FADBB50-8030

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 4F0-910-517.clb
   Part No SW: 4F0 910 517 AD    HW: 4F0 614 517 AA
   Component: ESP8 quattro    H01 0070 
   Revision: 00000000    Serial number: 00000000000000
   Coding: 0020895
   Shop #: WSC 02325 785 00200
   VCID: 66C875FB5179A6A359-8032

No fault code found.

-------------------------------------------------------------------------------
Address 05: Acc/Start Auth.        Labels:. 4F0-910-852.clb
   Part No SW: 4F0 910 852     HW: 4F0 905 852 B
   Component: FBSAUDIC6 ELV   H31 0230 
   Revision: 09010701    Serial number: 10601500981499
   Coding: 0000003
   Shop #: WSC 02323 785 00200
   VCID: 63CE6CEFA24BD38BBE-8036

   Subsystem 1 - Part No: 4F0 910 131 J
   Component: FBSAUDIC6 EZS   H45 0080

   Subsystem 2 - Part No: 4F0 910 220 A
   Component: FBSAUDIC6 IDG   H01 0040

No fault code found.

-------------------------------------------------------------------------------
Address 07: Control Head        Labels: 4F0-910-7xx-07-H.clb
   Part No SW: 4F0 910 732 Q    HW: 4E0 035 729
   Component: Interfacebox    H43 4610 
   Revision: 00000000    Serial number: 303AS087558592
   Coding: 0000003
   Shop #: WSC 23436 444 100178
   VCID: 3162D6A7A837311B7C-8064

   Subsystem 1 - Part No: 4F0 910 609 E
   Component: Bedienteil MMIC6H01 0060

   Subsystem 2 - Serial number: 00000001025722

   Subsystem 3 - Serial number: 0113.03.080000000100011233

   Subsystem 4 - Serial number: 011233

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: 4F0-910-043.clb
   Part No SW: 4F0 910 043 A    HW: 4F1 820 043 AG
   Component: KLIMABETAETIGUNGH30 0020 
   Revision: 00000053    Serial number: 00000000482794
   Coding: 0524326
   Shop #: WSC 02325 785 00200
   VCID: 1C3C1713DFB5AC733F-8048

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect.        Labels: 4F0-910-279.lbl
   Part No SW: 4F0 910 279 K    HW: 4F0 907 279
   Component: ILM Fahrer      H18 0250 
   Revision: 00000000    Serial number: 4F0907279     
   Coding: 0012123
   Shop #: WSC 02335 785 00200
   VCID: 3162D6A7A837311B7C-8064

   Subsystem 1 - Part No: 4F1 910 113 C  Labels: 1KX-955-119.CLB
   Component: Wischer AudiC6  H05 0210 
   Coding: 00064784
   Shop #: WSC 02335 

   Subsystem 2 - Part No: 4E0 910 557 B  Labels: 8K0-955-559.CLB
   Component: REGENLICHTSENSORH13 0100 
   Coding: 00141886
   Shop #: WSC 02335 

3 Faults Found:
02746 - Bulb for Daytime Running Light; Right
            011 - Open Circuit
             Freeze Frame:
                    Fault Status: 01101011
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 145
                    Mileage: 262136 km
                    Time Indication: 0
                    Date: 2007.05.16
                    Time: 12:55:00

01496 - Bulb for Fog-Lamps; Left (L22)
            010 - Open or Short to Plus
             Freeze Frame:
                    Fault Status: 01101010
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 145
                    Mileage: 262136 km
                    Time Indication: 0
                    Date: 2007.05.16
                    Time: 12:55:00

01500 - Bulb for Fog-Lamps; Right (L23)
            010 - Open or Short to Plus
             Freeze Frame:
                    Fault Status: 01101010
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 145
                    Mileage: 262136 km
                    Time Indication: 0
                    Date: 2007.05.16
                    Time: 12:55:00


-------------------------------------------------------------------------------
Address 0E: Media Player 1 (R199)       Labels:. 4E0-035-785.lbl
   Part No SW: 4E0 035 785 F    HW: 4E0 035 785 B
   Component: SG ext.Player H15 0850 
   Revision: 00000000   
   Coding: 010000
   Shop #: WSC 00000 000 00000
   VCID: 2B5EC4CF4A1B5BCB46-807E

No fault code found.

-------------------------------------------------------------------------------
Address 0F: Digital Radio        Labels: 4E0-910-593-SIR.lbl
   Part No SW: 4E0 910 593 M    HW: 4E0 035 593 F
   Component: SDAR SIRIUS     H07 0160 
   Revision: 00000000    Serial number: AUZ4Z7G0227847
   Coding: 0000100
   Shop #: WSC 02323 785 00200
   VCID: 3162D6A7A837311B7C-8064

1 Fault Found:
02635 - Tuner Not Enabled/Activated
            000 - -
             Freeze Frame:
                    Fault Status: 01100000
                    Fault Priority: 7
                    Fault Frequency: 1
                    Reset counter: 138
                    Mileage: 315401 km
                    Time Indication: 0
                    Date: 2007.05.16
                    Time: 12:53:03


-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 4F0-910-655-8R.clb
   Part No SW: 4F0 910 655 F    HW: 4F0 959 655 A
   Component: 6N AIRBAG AUDI8RH30 0300 
   Revision: 15H30000    Serial number: 00359D0GB21H 
   Coding: 0013902
   Shop #: WSC 02325 785 00200
   VCID: 2A50C1CB85E142C3BD-807E

   Subsystem 1 - Part No: 4F0 910 339 B
   Component: BF-Gewichtsens. H03 0060

   Subsystem 2 - Serial number: 6332CSME32720A21V

   Subsystem 3 - Serial number: 6342CSME37305073X

   Subsystem 4 - Serial number: 6352QSME4B1C4419N

   Subsystem 5 - Serial number: 6362QSME497B2C73X

   Subsystem 6 - Serial number: 63734SME48062663-

   Subsystem 7 - Serial number: 63834SME3E2D29079

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel        Labels: 4F0-910-549.lbl
   Part No SW: 4F0 910 549 A    HW: 4F0 953 549 C
   Component: J0527               0410 
   Revision: 00H04000    Serial number: 90054073420366
   Coding: 0002241
   Shop #: WSC 02323 785 00200
   VCID: 275638FF96F37FABA2-8072

   Subsystem 1 - Part No: XXXXXXXXXXX
   Component: E0221           H02 0030

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 4F0-910-xxx-17.lbl
   Part No SW: 4F0 910 900 C    HW: 4F0 920 951 A
   Component: KOMBIINSTR. M73 H16 0240 
   Revision: 00200000    Serial number: 64811U618     
   Coding: 2065288
   Shop #: WSC 55881 067 57207
   VCID: 204423E3F3DD8893E3-8074

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway        Labels:. 4L0-910-468.clb
   Part No SW: 4L0 910 468 A    HW: 4L0 907 468 B
   Component: J533__Gateway   H06 0060 
   Revision: 00H06000    Serial number: 1100B07C278029
   Coding: E5D59E77703A0600
   Shop #: WSC 08167 444 52513
   VCID: 2D5ACAD7B40F55FB58-8078

No fault code found.

-------------------------------------------------------------------------------
Address 1E: Media Player 2        Labels: 4E0-910-111.lbl
   Part No SW: 4E0 910 110 E    HW: 4E0 035 110 A
   Component: MP3-Changer     H46 0390 
   Revision: 00046007    Serial number: AUZ5ZBG3526018
   Shop #: WSC 00000 000 00000
   VCID: 1A30110BD581D2432D-804E

No fault code found.

-------------------------------------------------------------------------------
Address 36: Seat Mem. Drvr        Labels: None
   Part No SW: 4F0 910 760     HW: 4F0 959 760
   Component: Sitzmemory FS   H04 0050 
   Revision: 00000000    Serial number: 00000000896400
   Coding: 0082946
   Shop #: WSC 02145 785 00200
   VCID: 61C266E7B857C19BAC-8034

No fault code found.

-------------------------------------------------------------------------------
Address 37: Navigation        Labels: 4E0-910-88x-37.lbl
   Part No SW: 4E0 910 888 F    HW: 4E0 919 887 M
   Component: MNS US          H51 0990 
   Revision: 00000000    Serial number: 313KL077530072
   Shop #: WSC 08167 444 52513
   VCID: 3162D6A7A837311B7C-8064

No fault code found.

-------------------------------------------------------------------------------
Address 42: Door Elect, Driver        Labels: 4F0-910-793-42.lbl
   Part No SW: 4F0 910 793 E    HW: 4F0 959 793 E
   Component: TSG FA          H12 0210 
   Revision: 00-00000   
   Coding: 0035563
   Shop #: WSC 02327 785 00200
   VCID: 2C5CC7D38F155CF34F-8078

1 Fault Found:
02115 - Locking Unit for Central Locking
            008 - Implausible Signal
             Freeze Frame:
                    Fault Status: 01101000
                    Fault Priority: 3
                    Fault Frequency: 6
                    Reset counter: 144
                    Mileage: 315401 km
                    Time Indication: 0
                    Date: 2007.05.16
                    Time: 13:01:41


-------------------------------------------------------------------------------
Address 46: Central Conv.        Labels:. 4F0-910-289.lbl
   Part No SW: 4F0 910 289 J    HW: 4F0 907 289 J
   Component: Komfortgeraet   H26 0210 
   Revision: 02100026    Serial number: 01089971120000
   Coding: 4618269
   Shop #: WSC 02335 785 00200
   VCID: 3162D6A7A837311B7C-8064

   Subsystem 1 - Part No: 1K0 951 605 C
   Component: LIN BACKUP HORN H03 1301

1 Fault Found:
01134 - Alarm Horn (H12)
            012 - Electrical Fault in Circuit
             Freeze Frame:
                    Fault Status: 01101100
                    Fault Priority: 3
                    Fault Frequency: 254
                    Reset counter: 145
                    Mileage: 267193 km
                    Time Indication: 0
                    Date: 2019.11.30
                    Time: 11:48:06


-------------------------------------------------------------------------------
Address 47: Sound System        Labels: 4F0-910-223-BO.lbl
   Part No SW: 4F0 910 223 J    HW: 4F0 035 223 G
   Component: DSP-High C6     H10 0240 
   Revision: PROD_01     Serial number: 00000000066873
   Coding: 0000016
   Shop #: WSC 02323 785 00200
   VCID: 254A32F7ECFF6DBB90-8070

No fault code found.

-------------------------------------------------------------------------------
Address 4F: Centr. Electr. II        Labels: 4F0-910-280.lbl
   Part No SW: 4F0 910 280     HW: 4F0 907 280 C
   Component: ILM Beifahrer   H12 0100 
   Revision:             Serial number: 00000000126477
   Coding: 0002014
   Shop #: WSC 02323 785 00200
   VCID: 5EB85D1B8929FE6391-800A

No fault code found.

-------------------------------------------------------------------------------
Address 52: Door Elect, Pass.        Labels: 4F0-910-793-52.lbl
   Part No SW: 4F0 910 793 E    HW: 4F0 959 792 E
   Component: TSG BF          H12 0210 
   Revision: 00-00000   
   Coding: 0035563
   Shop #: WSC 02327 785 00200
   VCID: 2C5CC7D38F155CF34F-8078

No fault code found.

-------------------------------------------------------------------------------
Address 53: Parking Brake        Labels: 4F0-910-801.clb
   Part No SW: 4F0 910 801 C    HW: 4F0 907 801 A
   Component: EPB  CDEC0080   H04 0080 
   Revision: --H04---   
   Coding: 0005022
   Shop #: WSC 02145 785 00200
   VCID: 204423E3F3DD8893E3-8074

No fault code found.

-------------------------------------------------------------------------------
Address 55: Headlight Range        Labels: 8P0-907-357.lbl
   Part No: 8P0 907 357 H
   Component: Dynamische LWR  H01 0010 
   Revision: 00000001    Serial number:               
   Coding: 0000003
   Shop #: WSC 02325 785 00200
   VCID: 3F86809F6E63D76BFA-806A

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio        Labels: 4E0-910-541.lbl
   Part No SW: 4E0 910 541 T    HW: 4F0 035 541 L
   Component: TUNER EU/US/RDW H42 0630 
   Revision: 00000000    Serial number: 394AK087850120
   Coding: 0000002
   Shop #: WSC 02323 785 00200
   VCID: 3162D6A7A837311B7C-8064

2 Faults Found:
00532 - Supply Voltage B+
            002 - Lower Limit Exceeded - Intermittent
             Freeze Frame:
                    Fault Status: 00100010
                    Fault Priority: 7
                    Fault Frequency: 1
                    Reset counter: 176
                    Mileage: 315367 km
                    Time Indication: 0
                    Date: 2023.12.09
                    Time: 07:29:34

00446 - Function Limitation due to Under-Voltage
            002 - Lower Limit Exceeded - Intermittent
             Freeze Frame:
                    Fault Status: 00100010
                    Fault Priority: 7
                    Fault Frequency: 252
                    Reset counter: 177
                    Mileage: 315367 km
                    Time Indication: 0
                    Date: 2023.12.09
                    Time: 07:28:59


-------------------------------------------------------------------------------
Address 61: Battery Regul.        Labels: 4F0-910-181.clb
   Part No SW: 4F0 910 181 E    HW: 4F0 915 181 A
   Component: J0644 BEM       H12 0590 
   Revision: 00000000    Serial number: 00000000153402
   Shop #: WSC 23190 444 92096
   VCID: 234E2CEFE2CB938BFE-8076

   Subsystem 1 - Part No: 915 089 KDS P
   Component: von VA0  34050991L4       
   Coding: 3931353038394B4453502056413033343035303939314C34
   Shop #: WSC 29120 001 104857

2 Faults Found:
02254 - Interface to Generator
            004 - No Signal/Communication - Intermittent
             Freeze Frame:
                    Fault Status: 00100100
                    Fault Priority: 4
                    Fault Frequency: 1
                    Reset counter: 184
                    Mileage: 315591 km
                    Time Indication: 0
                    Date: 2007.05.20
                    Time: 15:34:00

02479 - Partial Consumer Shut-Off Active
            000 - - - Intermittent
             Freeze Frame:
                    Fault Status: 00100000
                    Fault Priority: 7
                    Fault Frequency: 2
                    Reset counter: 255
                    Mileage: 315592 km
                    Time Indication: 0
                    Date: 2007.05.20
                    Time: 15:38:34


-------------------------------------------------------------------------------
Address 62: Door, Rear Left        Labels: 4F0-910-795.lbl
   Part No SW: 4F0 910 795 E    HW: 4F0 959 795 E
   Component: TSG HL          H21 0210 
   Coding: 0035370
   Shop #: WSC 02327 785 00200
   VCID: 2E58CDDBB9092EE361-807A

No fault code found.

-------------------------------------------------------------------------------
Address 65: Tire Pressure        Labels: 4F0-910-273-BA.lbl
   Part No SW: 4F0 910 273 B    HW: 4F0 907 273 A
   Component: Reifendruck 3   H05 0100 
   Revision: 00050100    Serial number: 00000600061697
   Coding: 0062221
   Shop #: WSC 02145 785 00200
   VCID: 224029EBFDD19A83F5-8076

1 Fault Found:
01521 - Sensor for Tire Pressure
            002 - Lower Limit Exceeded - MIL ON
             Freeze Frame:
                    Fault Status: 11100010
                    Fault Priority: 3
                    Fault Frequency: 2
                    Reset counter: 142
                    Mileage: 315401 km
                    Time Indication: 0
                    Date: 2007.05.16
                    Time: 12:53:33

             Freeze Frame:
                    (no units): 0.0
                    Voltage: 12.00 V
                    (no units): 19.0
                        Not Recogn.
                        Not Recogn.
                        Not Recogn.
                        Not Recogn.


-------------------------------------------------------------------------------
Address 72: Door, Rear Right        Labels: 4F0-910-795.lbl
   Part No SW: 4F0 910 795 E    HW: 4F0 959 794 E
   Component: TSG HR          H21 0210 
   Coding: 0035370
   Shop #: WSC 02327 785 00200
   VCID: 2E58CDDBB9092EE361-807A

No fault code found.

-------------------------------------------------------------------------------
Address 77: Telephone        Labels: 4E0-910-336.lbl
   Part No SW: 4F0 910 336 H    HW: 4E0 862 335
   Component: Handyvorb2      H18 1130 
   Revision: 00000000    Serial number: 00000005020251
   Coding: 0010900
   Shop #: WSC 00000 000 00000
   VCID: 28543BC39BED70D3AB-807C

No fault code found.

End-------------------------(Elapsed Time: 02:53)--------------------------

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


Address 61: DTCs cleared
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


Address 01,4F2 910 559 H,channel 0,adapted from,---,to,000,
 
   #2  

headliner

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hello
did you change a battery ?
did you do little digi talch , by programming battery ?
seems like your car can be from snow belt, how are grounds?
 
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Uwe

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What's the story with this fault?
02254 - Interface to Generator
004 - No Signal/Communication - Intermittent
Freeze Frame:
Fault Status: 00100100
Fault Priority: 4
Fault Frequency: 1
Reset counter: 184
Mileage: 315591 km
Time Indication: 0
Date: 2007.05.20
Time: 15:34:00

Does this happen even with the LIN bus at the alternator connected?

-Uwe-
 
   #4  

Wmdunk

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Uwe thanks for reply, the codes clear once plugged in, but then the gremlins take over, TB rapidly starts popping open and close, idle/rpms start to cycle between 700 and 900, timing swings 30-40 degrees, if your in group 61 the MVB for generator dynamic field is either full 100% or 0
and with scope on alternator output charging wave is a mess and up to 16v then down to 13v. also Headliner I did code the new battery
and not just part number but serial no. too it accepted it so that should be ok I also checked voltage drop from Alt. pos. to battery pos. and like wise alt. frame to grd. you also feel the surging no matter how fast you drive it so unplugged it's like a new car
The only thing I can tell with it unplugged is the battery will have a steady dose of 14.3 which won't be too bad at least the engine is happy and not trying to freak out
 
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Uwe

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   #6  

Wmdunk

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Yes it was from an import parts house we have local, they said they are reman from a good supplier here, this is alt #3 the original one was on this car for awhile by the looks of it having this very same issue. The #2 was purchased from Oreilly autoparts not solving the issue either
 
   #7  

Uwe

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Sounds like the BEM module is wonky. List price for a new one is in the high three figures. Maybe try and find one in a scrapyard and swap it out as a test?

Since this car does not have a start/stop system, and the alternator happily "charges at 14.3 volts", I don't see much downside to running with the LIN to it disconnected. You're going to have at least one fault code in the BEM, but unless the engine ends up throwing a "sympathy" code, it won't be noticeable via generic OBD-II and won't prevent the car from being inspected.

-Uwe-
 
   #8  

Wmdunk

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Thanks for the help, this one took a bunch of time and patience who would have thought just unplugging that LIN would solve this complex situation?? and car is running like a top:D I will try to source that BEM at a wrecking yard but for now customer road off into the sunset, happy as a clam!!
 
   #9  

Wmdunk

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OH one last question, will BEM plug and play or most likely coding thru 61 grp?
 
   #10  

Uwe

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will BEM plug and play or most likely coding thru 61 grp?
I think it can be swapped; I doubt it has Component Protection.

The BEM itself doesn't have any coding, except that in the first "Subsystem" which specifies the battery. But the point of a scrapyard one is just to see if it will calm down the behavior of the alternator when it's connected.

-Uwe-
 
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