48 Steering Wheel Heating Does Not Heat Up Sufficiently (GROUP 48, NO. 25-77)
Reference number: GROUP 48, NO. 25-77
Supersedes refnos: 2065978, 2065978/1, 2065978/2, 2065978/3, 2065978/4, GROUP 48 NO. 22-17, GROUP 48, NO. 22-34, GROUP 48, NO. 23-53
48 STEERING WHEEL HEATING DOES NOT HEAT UP SUFFICIENTLY
TECHNICAL SERVICE BULLETIN
| AUDI: | 2019-2025 All Audi Vehicles |
| GROUP: | 48 - Steering |
SERVICE INFORMATION
48 25 77 2065978/4 January 9, 2025. Supersedes Technical Service Bulletin Group 48 number 23-53 dated August 4, 2023, for reasons listed below.
| Model(s) | Year | VIN Range | Vehicle-Specific Equipment |
|---|---|---|---|
| All Audi Vehicles | 2019 - 2025 | All | Not Applicable |
CONDITION
| Revision | Date | Purpose |
|---|---|---|
| 4 | - | Revised Condition
(Updated Information) Revised Technical Background (Updated Information) |
| 3 | 08/04/2023 | Revised header (Added Model Years) |
| 2 | 07/19/2022 | Revised Technical Background (Added Note) |
Customer states:
- The steering wheel does not heat up.
OR
- The steering wheel does not heat up sufficiently.
OR
- The steering wheel heats up unevenly.
OR
- It takes a long time for the steering wheel to heat up.
Workshop findings:
There are no DTCs related to the topic.
TECHNICAL BACKGROUND 1
The surface temperature may vary at different locations on the steering wheel due to uneven heat distribution, which may give the impression that the steering wheel heating is insufficient or is not working at all.
It may take over 30 minutes for the target temperature of approx. 30°C ± 3°C (86° F ± 5F°) to be reached. The amount of time required is strongly dependent on the interior temperature and the settings on the vehicle's heater/air conditioner.
The surface temperature of the leather may be lower in the vicinity of the spokes compared to the rest of the steering wheel, as some of the heat dissipates into the spokes.
The surface of the top part of the steering wheel (12 o'clock position) may also be heated up by sunlight, resulting in a clearly noticeable temperature difference. If the driver holds the steering wheel at the 9 and 3 o'clock positions, the leather will be warmed up by their hands. If the driver then touches the steering wheel at the 12 and 6 o'clock positions, it will be cooler at these locations since they have not been warmed up by the driver's hands.
The NTC temperature sensor fitted in the foam underneath the cover can also cause the complaint to be perceived differently.
When the desired surface temperature of 30°C (86° F) has been reached, the measured value for the sensor is 34°C (93° F), as this is the temperature underneath the cover.
PRODUCTION SOLUTION
Not Applicable.
SERVICE
Not Applicable.
WARRANTY
This TSB is informational only and not applicable to any Audi Warranty.
ADDITIONAL INFORMATION
All part and service references provided in this TSB (2065978) 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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