Connection offline
Transaction No.:

Technical Service Bulletin

2074273/5

91-24-05 - Car Net® 2.0 - Emergency Call Module and Communication Unit -J949Vehicle is Offline (Not Connected)

Condition
Applicable Vehicles
Model(s)

Year

Eng. Code

Trans. Code

VIN Ranger
From

VIN Range To

Jetta, Golf, GTI,
Passat, Arteon,
Tiguan LWB,
Atlas, Atlas
Cross Sport

2020-2024

All

All

All

All

Taos, ID.4

2022-2025

All

All

All

All

Golf, GTI, Jetta,
Atlas, Atlas
Cross Sport, ID.
Buzz, Tiguan

2025

All

All

All

All

Revision Table
Instance Number

Published Date

Version Number

Reason For Update

2074273/5

8/27/2025

91-24-05

Update models and update diagnostic
procedures.

2074273/4

7/16/2025

91-24-05

Incorporate Elsa2Go tools and update
diagnostic procedures.

2074273/3

10/16/2024

91-24-05

To include MY 2025 applicability.

2074273/2

8/20/2024

91-24-05

To update contact information.

2074273/1

7/3/2024

91-24-05

Original Publication.

Technical Background
Operating Control Unit (OCU/J949)

The device allowing online telematic services is called the Operating Control Unit (OCU), also known as
Online Connectivity Unit. It is a cellular module manufactured by LGE and equipped with an integrated eSIM,
managing the wireless communications from the vehicle to the LTE networks. Just like smartphones, the
OCU shares the same unique identifiers of the IMEI and ICCID which are like the Vehicle Identification
Number (VIN) of a vehicle but for a mobile device.
The OCU is installed within the vehicle in Various locations, e.g.: under rear seats, behind the dashboard,
etc. The OCU requires connection to both the LTE and the GPS antenna to operate.
In addition to wireless voice and data call services, the OCU can provide various online services like Remote
Function Services (Door Lock/Unlock), Vehicle Health Report and Vehicle Tracking if the applicable service
is purchased by the customer.

myVW® may not fully complete the initial Register and Pairing process (R&P) after removal of transport
mode during ePDI. This may result in a lack of functionality of the myVW® services.
On MY 2020 and later vehicles equipped with myVW® while performing the PDI:
Once you take the vehicle out of transport mode, it may take up to 30 minutes for the system to come online.
The green LED in the overhead console is an indicator that the vehicle has made a good connection;
however, the definitive status can be found in Elsa2Go. On the figure below, verify that the vehicle is “
Connected” and Register & Pairing is marked “Complete”. Any other status, in either of these spaces,
indicates that the system is not operating correctly and requires intervention.

Figure 1
An incorrect status indicates that no connection was established. All vehicles equipped with myVW® need
the status indicators in Elsa2Go to be as shown above; prior to being delivered to the customer.

The most common causes for connectivity failure are:
•

•

Limited, or no, cellular coverage in the vehicle’s current location.
‒

To exclude this issue, perform a brief test drive in a different area.

‒

Test drive must be 20 minutes long.

Vehicle has faults and DTC’s in ODIS (Carnet® specific).
‒

Resolve all faults identified in ODIS.

•

•

Technician did not follow the correct process to take the vehicle out of Trasport Mode.
‒

Verify ODIS Service Version 7.2.1 or newer.

‒

Perform the ODIS/OBD test Plan (Guided Function “Perform service work for vehicle handover”).

Faulty connection between the -J949- and the antenna.
‒

Verify connectivity via GFF in ODIS.

Below is a high-level overview of the Register & Pairing process:

Figure 2

Production Solution
Not Applicable.

Service
In order for myVW® to successfully complete the R&P process, perform the transport mode removal test
plan titled “Perform service work for vehicle handover”, auto populated under Guided Fault Finding (GFF)
which includes activation & registration of the OCU. Once the test plan is completed, check the Elsa2Go
status. If it still is not correct, take the vehicle outside and let it run for approximately 15-20 minutes.
If the concern still remains and the status is not correct, perform the following steps:
Part 1.
1.1. Connect the ODIS tester to the vehicle and initiate Guided Fault Finding (GFF).
1.2. Once the GFF module interrogation is complete, select Address 0075 Emergency Call Module and “right
click”, then select “Adaptation”.
1.3. Search for “mobile online services, activation threshold”. If the “Current value” is NOT 0, manually
change the value to 0, then attempt to re-initiate the R&P process.

Figure 3.

If there is no change in the condition, check the measured value in Address 0075 via “Read measuring
values” and search for “Status GPS Reception” and “Connection status”.
Status GPS Reception should show a minimum value of 4 visible satellites and 4 tracked satellites.
Connection status Validity should read “Valid”.

Figure 4.
If there is still no change in the condition, proceed to step Part 2.

Part 2 (With Ignition OFF)
2.1. Open the driver door.
2.2. To the left and below the steering wheel, open and remove the pull-out compartment door (Approx. 4”x
6”) by pressing the detent lever inside/above, exposing the fuse box.
2.3. Remove the 7.5 amp fuse in position SC17 (for all MQB platform vehicles). The instrument cluster losing
power is an indication that the proper fuse was pulled. (Figure 3.) Remove the 7.5-amp fuse in position SC19
(for all MQB-37W platform vehicles). (Figure 4.)

2.4. Wait 15 minutes with the fuse out to allow the Control Module for Emergency Call Module and
Communication Unit -J949- internal backup battery to completely discharge.
2.5. Re-insert the fuse into the slot and reinstall the pull outdoor.
2.6. Switch the vehicle ignition ON and observe the 3-button module for 2 minutes.
2.7. Check the Elsa2Go status to see if the process was successful. (After performing any recovery task, you
will need to press the “Refresh Status” link on the Elsa2Go screen.
2.8. If the Elsa2Go status is not correct after 2 minutes, keep the vehicle running outside for an additional 20
minutes to allow the process to complete.
2.9. After 20 minutes, check the Elsa2Go status to see if the process was successful. Status indicators have
changed to “Connected” and “Complete”.
Part 3 – Advanced Diagnostics
In section 2, we performed all the “easy” tasks that will resolve the majority of R&P issues. In this section, we
will perform more complex diagnostics. All these steps require connecting ODIS tester to the vehicle and
initiate Guided Fault Finding (GFF). Once the GFF module interrogation is complete, select Address 0075
Emergency Call Module.
3.1. Target Data Container Validation
•

Objective: Confirm the -J949- has a valid Target Data Container

•

How to Check: In your GFF paperless log under 0075 for -J949- look for “Target Data Container” and
“Version of Target Data Container”.

•

Expected: Both fields should be populated, as ZDC contains critical values such as the APN and
backend URL information

•

Failure Indicator: If the container or version is blank or missing, configuration is incomplete

•

Resolution: Run the Replacement Test Plan (RTP) or execute the Software Configuration test plan.
After completion, request a new GFF log with measured values to validate the configuration update.

3.2 Transport Mode & RTP Check
•

Objective: Ensure that the correct test plan was executed to bring the vehicle out of the transport
mode. In the case of Replacement Test Plan (RTP), verify that all the required steps were completed.

•

How to Check:
‒

Search for “Test step: Test Description” and find “Action: Message” entries

‒

If the test description only says “Deactivate transport mode” it indicates an incorrect or
incomplete test plan was used

‒

Failure Indicator: Log shows only “Deactivate transport mode” with no follow up actions (e.g.
Activate OCU, Software Configuration, VKMS. For RTP, steps will be missed.

Incorrect Test Plan

Correct Test Plan

Correct Replacement Test Plan

Deactivate transport mode

Perform service work for vehicle
handover.

Replace control module

-

Activate OCU

Perform initial operation

-

Reset service values (depending
on equipment)

VKMS activation

-

Perform battery check

Perform software configuration

-

Reset adaptation values,
Emergency battery

Adapting anti-theft immobilizer

-

Register OCU

Activate OCU

-

-

Reset control module

-

-

Register OCU

-

-

Reset adaptation values,
Emergency battery

•

Resolution: Run the correct test plan, and upload GFF logs with measured values.

3.3 Low Voltage Scenario
•

Objective: Identify and resolve power instability affecting control modules, especially 0075F (OCU) and
005F (MIB Head Unit).

•