This information is only for the BMS_48V_LiIon variants. Connect to address 61 for Battery Regulation and verify the data in Component field:
If BMS_48V_LiIon is not shown in the Component field, this information may not apply.
1) The information in section 1 assumes the 48V system is in working order, but needs to be disconnected for repairs to be performed.
The 48 volt electrical system must be de-energized with a scan tool prior to any work on the 12V and/or 48V volt electrical system.
Prerequisites:
Verify current status of the 48V electrical system:
[Select]
[19-CAN Gateway]
[Adv.Meas. Values]
To de-energize 48V system:
[Select]
[19-CAN Gateway]
[Adaptation -10]
Note: some systems may require Security Access 20103 to enable adaptation.
[SAVE]
This should now open the contractor and the 48V system should be de-energized.
Verify the current status of the 48V electrical system with the [19-CAN Gateway] (see above).
To energize 48V system:
[Select]
[19-CAN Gateway]
[Adaptation -10]
Note: some systems may require Security Access 20103 to enable adaptation.
[SAVE]
This should now close the contractor and the 48V system should be energized.
Verify the current status of the 48V electrical system with the [19-CAN Gateway] (see above).
2) The information in section 2 assumes the 48V system Alternator (Address CC-Starter-Generator/C29) failed.
After replacement of the faulty alternator (Address CC) needs to be coded.
This is an example of a faulty alternator prior to replacement:
The coding from the original Auto-Scan prior to repairs should be used to code the new unit. VCDS offers Long Coding Helper information if the old one reported Cannot be reached.
The 12V battery needs to be in good condition prior to moving forward after alternator replacement. If the 12V battery needed to be replaced make sure to adapt the replacement in Address 19-CAN Gateway using the Adaptation channels:
In most cases the 48V system cannot charge correctly after repairs due to the initial alternator failure due to low SoC. When this happens manual charging is needed. See below.
Manually charging 48V system:
Plan on charging for at least 2 hours minimum.
Prerequisites:
Checking 12V battery SoC:
[Select]
[19-CAN Gateway]
[Adv.Meas. Values]
Checking 48V battery SoC
[Select]
[61-Battery Regul.]
[Adv.Meas. Values]
Close Charging Contactor
If SoC values for 12V battery and 48V battery are within factory specifications, hook up the +100A battery charger.
[61-Battery Regul.]
[Adaptation -10]
[SAVE]
The vehicle should cycle the ignition on its own. When the contactors close, you may hear a clicking noise.
Warning! As per the TSB, do not alter or change the following during charging:
TSB revisions from Audi:
2067906
2067906/1 (17-22-20)
2067906/2 (27-23-50)
2067906/3 (27-23-60)
2067906/4 (27-23-61)
2058831
2058831/2 (27-21-37)
2058831/8 (27-23-55)
2058831/12 (27-24-65)
2067937
2067937/1 (24-22-60)
Possible recalls:
Address 61: Battery Regul. (J1120) Labels: 4N0-915-105.clb
Part No SW: 4N0 915 105 B HW: 4N0 915 105 B
Component: BMS_48V_LiIon H06 0108
If BMS_48V_LiIon is not shown in the Component field, this information may not apply.
1) The information in section 1 assumes the 48V system is in working order, but needs to be disconnected for repairs to be performed.
The 48 volt electrical system must be de-energized with a scan tool prior to any work on the 12V and/or 48V volt electrical system.
Prerequisites:
- Key-On, Engine-Off
- Follow ALL Safety Warnings in the Official repair manuals
- Do NOT proceed if you are not familiar with the 48V MHEV electrical system!
- Personal protective equipment (safety goggles and protective gloves) must be worn during this procedure!
Verify current status of the 48V electrical system:
[Select]
[19-CAN Gateway]
[Adv.Meas. Values]
- IDE13850-MAS15722-Onboard network diagnosis 48V 2-Battery management 48V: actual voltage
- IDE13850-MAS15119-Onboard network diagnosis 48V 2-48-Volt vehicle electrical system
To de-energize 48V system:
[Select]
[19-CAN Gateway]
[Adaptation -10]
- IDE11689-48V-System: locking
Note: some systems may require Security Access 20103 to enable adaptation.
[SAVE]
This should now open the contractor and the 48V system should be de-energized.
Verify the current status of the 48V electrical system with the [19-CAN Gateway] (see above).
To energize 48V system:
[Select]
[19-CAN Gateway]
[Adaptation -10]
- IDE11689-48V-System: locking
Note: some systems may require Security Access 20103 to enable adaptation.
[SAVE]
This should now close the contractor and the 48V system should be energized.
Verify the current status of the 48V electrical system with the [19-CAN Gateway] (see above).
2) The information in section 2 assumes the 48V system Alternator (Address CC-Starter-Generator/C29) failed.
After replacement of the faulty alternator (Address CC) needs to be coded.
This is an example of a faulty alternator prior to replacement:
Address CC: Starter-Generator (C29) Labels:* None
Part No SW: 4N0 903 028 P HW: 4N0 903 028 P
Component: BSG-HP1-65 H18 0527
Coding: 20000400000000
1 Fault Found:
26446 - Internal Control Module Memory Check Sum Error
B2000 96 [00101111] - Component Internal Failure
[MOSFET Diagnosis - Power Electronic]
Confirmed - Tested Since Memory Clear
The coding from the original Auto-Scan prior to repairs should be used to code the new unit. VCDS offers Long Coding Helper information if the old one reported Cannot be reached.
The 12V battery needs to be in good condition prior to moving forward after alternator replacement. If the 12V battery needed to be replaced make sure to adapt the replacement in Address 19-CAN Gateway using the Adaptation channels:
[*IDE03256-MAS06105*] Battery adaptation - Rated battery capacity
[*IDE03256-MAS06106*] Battery adaptation - Battery technology
[*IDE03256-MAS06107*] Battery adaptation - Battery manufacturer
[*IDE03256-MAS06108*] Battery adaptation - Battery Serial Number
In most cases the 48V system cannot charge correctly after repairs due to the initial alternator failure due to low SoC. When this happens manual charging is needed. See below.
Manually charging 48V system:
Plan on charging for at least 2 hours minimum.
Prerequisites:
- VCDS computer plugged up to wall and disable sleep settings.
- 48V battery must be between 5% and 15%, see 48V SoC checking below
- 12V battery must be between 40% and 60%, see 12V SoC checking below (battery may not have to below 60%).
- 12V charger, with a minimum output of 100 amps continuous.
- Non essential electrical loads off (headlights, HVAC blower motor, ect).
Checking 12V battery SoC:
[Select]
[19-CAN Gateway]
[Adv.Meas. Values]
- IDE01839-Battery charge level
Checking 48V battery SoC
[Select]
[61-Battery Regul.]
[Adv.Meas. Values]
- IDE01839-Battery charge level
Close Charging Contactor
If SoC values for 12V battery and 48V battery are within factory specifications, hook up the +100A battery charger.
- Do not hook directly to the negative post of the battery!
- Connect the negative cable to chassis or the jump-start ground post.
- Some versions of [61-Battery Regul.] may require Security Access 20103 to enable [Adaptation -10].
[61-Battery Regul.]
[Adaptation -10]
- IDE06383-Closing of protection for charge of H-V battery
[SAVE]
The vehicle should cycle the ignition on its own. When the contactors close, you may hear a clicking noise.
Warning! As per the TSB, do not alter or change the following during charging:
- Doors... don't open or close them
- Hood... don't open or close it
- Rear lid.... you better not even look at it
- Ignition switch... no you big dummy
- Key fob location... do not move it
- Ross-Tech device in OBDII port... do not unplug from car.
TSB revisions from Audi:
2067906
2067906/1 (17-22-20)
2067906/2 (27-23-50)
2067906/3 (27-23-60)
2067906/4 (27-23-61)
2058831
2058831/2 (27-21-37)
2058831/8 (27-23-55)
2058831/12 (27-24-65)
2067937
2067937/1 (24-22-60)
Possible recalls:
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