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Technical Service Bulletin
Topic 27 Q4 12V battery discharged/drive system not activated/keyless opening intermittently inop,
PI DTC U101100, U140000
United States 444 Volkswagen of America, Inc. (6444)
No.
[Status | Released for publishing
Release date |Mar 6, 2025
New customer code
Object of complaint Complaint type [Position |
engine -> engine operation -> engine start functionality -> no function [|
information, navigation, communication, entertainment -> warning . . .
. Fi A . functionality -> activates
display symbols -> parking brake warning display
information, navigation, communication, entertainment -> indicator functionality -> activates
display symbols -> parking brake indicator display
control modules, services ->
vehicle service -> vehicle diagnosis -> Guided Fault Finding (GFF) |with fault stored in the DTC
memory
information, navigation, communication, entertainment -> indicator |functionality -> activates without
display symbols -> parking brake indicator display cause
engine -> engine operation -> engine start functionality -> misfire [|
information, navigation, communication, entertainment -> functionality -> activates without
malfunction display symbols -> vehicle electrical system y
een cause
malfunction indicator
access control, start authorization, anti-theft protection ->
locking/unlocking vehicle -> door release -> door unlocking with functionality -> no function
mobile device
engine -> engine operation -> electro-drive mode functionality -> no function |
| - . A functionality -> cannot be
engine -> engine operation -> electro-drive mode switched on/activated | |
engine -> engine operation -> electro-drive mode functionality -> does net switch
on/connect
information, navigation, communication, entertainment ->
information display symbols -> battery charge level information functionality -> activates
display
chassis -> brakes, brake regulation -> electronic parking brake functionality -> cannot be
(EPB) switched off/deactivated
chassis -> brakes, brake regulation -> electronic parking brake functionality -> switches on by
(EPB) itself
power, vehicle electrical system, data transfer -> power supply -> electrical -> voltage too low
starter battery

Object of complaint Complaint type [Position |
information, navigation, communication, entertainment -> indicator | functionality -> gives incorrect
display symbols -> parking brake indicator display reading
engine -> engine operation -> engine running functionality -> stopped [|
body attachments and installations -> doors, lids operation -> open |functionality -> cannot be left front
door opened
information, navigation, communication, entertainment -> warning | functionality -> activates without
display symbols -> parking brake warning display cause
Fo ee el _|funconaliy > operation
eae x , sequence incorrect
application (app)
information, navigation, communication, entertainment -> cell
phone functions, customer portal, applications -> mobile terminal _ | functionality -> no function
application (app)
information, navigation, communication, entertainment -> cell control modules, services -> no
phone functions, customer portal, applications -> mobile terminal data transfer ,
application (app)
information, navigation, communication, entertainment -> cell . .
. ron functionality
phone functions, customer portal, applications
vehicle service -> inspection, maintenance -> maintenance table -> control modules, services ?
: , with fault stored in the DTC
other service offers
memory
information, navigation, communication, entertainment -> warning functionality -> activates
display symbols -> generator control warning display
information, navigation, communication, entertainment -> warning functionality -> activates
display symbols -> active warning warning display
information, navigation, communication, entertainment -> driver
information system (DIS, MFI, MMI) -> text display -> message: functionality -> activates
vehicle energy system error
information, navigation, communication, entertainment -> driver
information system (DIS, MFI, MMI) -> text display -> message: functionality -> activates
please service vehicle
information, navigation, communication, entertainment -> Online . .
; functionality
Services
information, navigation, communication, entertainment -> functionality
Telematics, online services
information, navigation, communication, entertainment -> radio functionality -> no function
operation -> radio reception -> Internet radio reception
access control, start authorization, anti-theft protection -> functionality -> partially out of > no
locking/unlocking vehicle -> door release -> keyless entry door YP y ; ,
order instruction <
release
A . , 5 functionality -> operation
engine -> engine operation -> engine start sequence incorrect
engine -> engine operation -> engine start functionality -> partially out of | |
order
access control, start authorization, anti-theft protection -> functionality -> cannot be
locking/unlocking vehicle -> rear lid release -> rear lid release with y
released
remote control
access control, start authorization, anti-theft protection -> functionality -> cannot be
locking/unlocking vehicle -> rear lid - release released

Object of complaint Complaint type [Position |
assistance systems, comfort controls -> convenience
opening\closing -> convenience opening -> door window functionality -> no function
convenience opening
access control, start authorization, anti-theft protection -> functionality -> cannot be
locking/unlocking vehicle -> door release -> door release with y
released
remote control
engine -> engine operation -> engine running functionality -> irregular |
information, navigation, communication, entertainment ->
malfunction display symbols -> vehicle electrical system functionality -> activates
malfunction indicator
vehicle service -> inspection, maintenance -> maintenance table -> |service: process -> with
other service offers complaint confirmation
body attachments and installations -> doors, lids operation -> open | functionality -> cannot be
power rear lid opened
vehicle service -> inspection, maintenance -> maintenance table -> | service: process -> with
delivery inspection complaint confirmation
vehicle service -> inspection, maintenance -> maintenance table -> | service: process -> with
battery maintenance program complaint confirmation
vehicle service -> inspection, maintenance -> maintenance table -> | service: process -> with
service for vehicles in inventory complaint confirmation
New workshop code
Object of complaint Complaint type [Position|
power, vehicle electrical system, data transfer -> power supply -> starter electrical -> voltage too
battery low
Vehicle data
Q4 MJ22-24
Sales types
aoa fT
asa fT
PR numbers
?:with NI1
?:or ?:with NI9
Documents

sichtpruefung_batterie_ali_032016.pdf
sichtpruefung_batterie_ali_032016.docx

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Technical Service Bulletin Transaction No.: 2077115/1

top. DTC LION I80. U1a0e00 system not activated/keyless opening intermittently Release date: Mar 6, 2025

Condition

Customer states:

+ The following message appears on the driver information display:
— “12V battery is low. Charge by driving.”

or

+ The vehicle cannot be unlocked with the vehicle key (remote control).

and/or

+ Keyless opening often does not work.

and/or

+ The drive system cannot be activated.

and/or

+ No vehicle electrical systems react/work.

and/or

+ Online services are not available and cannot be used.

and/or

* — myAudi app air conditioning and charging function cannot be used.

Workshop findings:

One or more of the customer statements can be reproduced:

+ The 12V battery is discharged/defective.

and/or

+ A fault was found while checking the 12V battery during a maintenance/service event and the customer
commissioned a repair.

One or more of the following DTCs are logged in the Data Bus On Board Diagnostic Interface, J533 (diagnostic

address: 0019):

+ DTC U101100: Supply voltage, voltage too low

and/or

+ DTC B1802F1: Low voltage energy management warning triggered

and/or

+ DTC U140A00: Terminal 30 open circuit

DTCs indicating undervoltage are logged in other control units, for example:

+ DTC U140000: Function restriction due to insufficient voltage

and/or

+ DTC B10CD00: Function limitation due to energy management
Technical Background

Issue with 12V components, e.g.:

+ Battery maintenance program for stock vehicles not taken into account (billing under warranty not

possible).

+ Technical issue on the vehicle.

+ Maintenance/service event for 12V components in vehicle not taken into account.

° External influences on 12V components in vehicle.

Production Solution

Not applicable.

Service

1. The driver information display shows the message “12V battery is low. Charge by driving.
2. Complaints relating to “12V battery discharged/defective”

Important: For Q4 vehicles (UNECE):

— The 12V battery test with the vehicle diagnostic tester may indicate that a test with -VAS 6161- is
required.

- For the evaluation of the 12V battery, the condition "Charge level at least 80%" must be met.

— Inthe event of a complete discharge, the 12V battery can be charged using the high-voltage battery
without an external charger following a test in accordance with the Workshop Manual/parts catalogue.
The vehicle’s drive system must be active for this.

— The 12V battery must not be charged directly at the negative terminal. The negative wire must always
be connected to a suitable earth point on the vehicle when charging with an external charger.

- A faulty 12V battery must only be submitted with the diagnostic log that has completed the evaluation
of the test plan “A - Battery, perform test”. In the event of a visual defect, clear pictures/photos of the
complaint must be attached in the Warranty DOC-IT page or TAC ticket.

— Anewly installed 12V battery must always be adapted to the vehicle using the Guided Function.

A coution

Risk of electrolyte leaking/subsequent damage. The following must be observed if the 12V battery is

completely discharged, or the charge level is below 50%:

— The 12V battery must only be charged with a maximum charge current of 55A. Charging using a
charge current greater than 55A causes electrolyte fluid to leak from the 12V battery and results in
subsequent damage.

— If charging equipment from another manufacturer is used, ensure not to exceed the maximum
charging current of 55A.

The following VAS battery chargers are permitted/enabled (set maximum charging current of 55A):

— VAS 5900 / VAS 5900A

- VAS 5906 / VAS 5906A

— VAS 5907

— VAS 5908

— VAS 622 001 (can only be used at level 1)

—- VAS 622 001A (use 50A mode)

— VAS 622 009

For 1: The driver information display displays the message “12V battery is low. Charge by driving.”:

Proceed as follows in the event of a complaint:

1.1 Refer the customer to the information in the Owner's Manual under "Checking and topping up fluids -> 12-volt

vehicle battery -> Solutions".

1.2 Connect the vehicle diagnostic tester to the vehicle. Then start Guided Fault Finding (GFF):

+ Check DTCs of the data bus diagnostic interface (diagnostic address: 0019).

+ For correct system/battery evaluation using the vehicle diagnostic tester, the DTC "B1802F1: LV energy
management warning triggered" must be entered in the data bus diagnostic interface control unit (diagnostic
address: 0019).

+ Run the automatically generated test plan in Guided Fault Finding (GFF) to obtain the system/battery
evaluation.

For 2: Complaints relating to “12V battery discharged/defective”:

Proceed as follows in the event of a complaint:

2.1. Visual inspection/assessment.

2.2. Carry out technical evaluation using vehicle diagnostic tester.

2.3. Battery adaptation using Guided Fault Finding.

For 2.1: Visual inspection/assessment:

Battery: checking electrolyte level

Battery without magic eye

Procedure:

+ Check battery housing for the following:
— Battery terminals are not corroded or damaged
— Mechanical damage to battery housing and cover, indicated by electrolyte leakage or crystals at the
damaged area

+ Replace damaged batteries -> 12V battery according to Workshop Manual/parts catalogue with part number
000 915 089 BA (even if this part number is greyed out in the parts catalogue).

+ Check electrolyte level of all battery cells using markings on housing.

+ If the electrolyte level in at least one battery cell is under the MIN marking: Replace battery -> 12V battery
according to Workshop Manual/parts catalogue with part number 000 915 089 BA (even if this part number is
greyed out in the parts catalogue).

Install in reverse sequence.

Note:

The MIN and MAX markings on the housing can be seen more easily by using a bright flashlight.

If battery is difficult to see: Use a small mirror to check the electrolyte level (shine a bright flashlight at a

right angle onto the battery cells).

Battery with magic eye:

Risk of explosion if magic eye is colorless or light yellow!

- Do not attempt to jump-start vehicle.

— Do not check or charge battery.

— Replace battery.

Procedure:

* Check battery housing for the following:

- Battery terminals are not corroded or damaged
— Mechanical damage to battery housing and cover, indicated by electrolyte leakage or crystals at the
damaged area

+ Replace damaged batteries -> 12V battery according to Workshop Manual/parts catalogue with part number
000 915 089 BA (even if this part number is greyed out in the parts catalogue).

+ Before checking electrolyte level: Tap magic eye -arrow- carefully with handle of a screwdriver.

Visual inspection/assessment:

+ Perform visual inspection of 12V battery on housing, connecting terminals and their threaded connections.

Supplier applies micro-oil as corrosion protection on end terminal and at transition between end terminal

socket and cover (see photo 1). These batteries are OK and do not need to be replaced.

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rene Se
A a - a
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ee ' 4. te BS /
\ | ae y} ‘ sa
————— ta R
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i
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Figure 1. Supplier applies micro-oil as corrosion protection on end terminal and at transition between end terminal

socket and cover.

+ Check threaded connections of earth cable on body and threaded connections of positive cables on fuse box
SA.

+ Ifthe 12V battery is judged to be defective during the visual inspection due to a leak at the housing or in the
area of the connection terminals, the 12V battery must be replaced according to the Workshop Manual/parts
catalogue. Attach clear pictures/photos to the Warranty DOC-IT page or TAC ticket.

+ If deviations are found while checking of the threaded connections, they must be rectified depending on the
type of issue. Attach clear pictures/photos to the Warranty DOC-IT page or TAC ticket.

Re 2.2 Technical assessment using the vehicle diagnostic tester:

Check the 12V battery with the vehicle diagnostic tester (exception: Guided Fault Finding (GFF) refers to a test with

the battery tester -VAS6161-):
The 12V battery must be evaluated using the vehicle diagnostic tester and the procedure described below:

+ Select: “Select own test...”

+ Select: “Service work”.
+ Select: Program: A - Battery, test.
+ Proceed according to the result of the vehicle diagnostic tester test program:

- Ifthe 12V battery is assessed as being defective after working through the test plan “A — battery (12V),
test” in Guided Fault Finding (GFF) with the vehicle diagnostic tester, further action must be carried out
according to the result of the test program. If GFF requires you to replace the 12V battery, replace it
according to the Workshop Manual/parts catalogue with part number 000 915 089 BA (even if this part
number is greyed out in the parts catalogue).

— If the 12V battery is assessed as being defective after the test with -VAS6161- is requested, replace it
Workshop Manual/parts catalogue with part number 000 915 089 BA (even if this part number is greyed
out in the parts catalogue).

- Ifthe 12V battery is not assessed as being defective in Guided Fault Finding (GFF) with the vehicle
diagnostic tester after working through the test plan “Perform battery test”, run the following programs:

1) Read battery data with program: 0019 Read data
2) If an DTC such as: “U140600 Static current too high” is logged in diagnostic address 0019, run the relevant test
program.
3) Save the diagnostic log online
For 2.3: Battery adaptation using Guided Fault Finding:
After replacing a defective 12V battery, a newly installed 12V battery must always be adapted to the vehicle using
Guided Fault Finding (GFF) with the "Program: A — Adapt battery (12V)":
+ Then the DTCs of all control units must be erased and requested again.
Warranty
Claim Type: + If the vehicle is outside of any warranty, this Technical Service Bulletin is
informational only.
Damage Code: 0040
Labor Operations: | GFF / Guided Function 0150 0010 See SRT with
associated
operations
GFF / Guided Function 0150 0060 Time stated on the
diagnostic protocol
Check Battery 2706 0150 See SRT with
associated
operations
Removing and installing battery (If necessary) 2706 1950 See SRT with
associated
operations
Claim Comment: As per TSB 2077115/1

All warranty claims submitted for payment must be in accordance with the Audi Warranty Policies and Procedures
Manual. Claims are subject to review or audit by Audi Warranty.

Additional Information

All part and service references provided in this TSB (2077115) are subject to change and/or removal. Always check
with your Parts Department and/or ETKA for the latest information and parts bulletins. Please check the Repair
Manual for fasteners, bolts, nuts, and screws that require replacement during the repair.

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