94 Headlights May Not Turn Off During Daylight Hours (GROUP 94, NO. 21-39)
Reference number: GROUP 94, NO. 21-39
Supersedes refnos: 2063739, 2063739/1
94 HEADLIGHTS MAY NOT TURN OFF DURING DAYLIGHT HOURS
TECHNICAL SERVICE BULLETIN
| AUDI: | 2018-2025 All Audi Vehicles |
| GROUP: | 94 - Lights - Exterior |
SERVICE INFORMATION
94 24 79 2063739/2 April 12, 2024. Supersedes Technical Service Bulletin Group 94 number 21-39 dated June 23, 2021, for reasons listed below.
| Model(s) | Year | VIN Range | Vehicle-Specific Equipment |
|---|---|---|---|
| All Audi Vehicles | 2018 - 2025 | All | Not Applicable |
CONDITION
| Revision | Date | Purpose |
|---|---|---|
| 2 | - | Revised header (Add Model Years) |
| 1 | 06/23/2021 | Initial publication |
When the light switch is in the "AUTO" position, the headlights are switched off later than expected or not at all during daylight.
TECHNICAL BACKGROUND
When the sun is low in the sky (particularly during winter) and especially if the sun is also behind the vehicle (Figure 1), it is possible that the light sensor is within the vehicle's shadow (Figure 2).
In such cases, the sensor detects a lower ambient brightness than perceived by the driver. In this case, it is possible that the headlights are not switched off as expected.
In addition to this, when the sky is clear/blue there is no cloud cover to reflect the sun's radiation back; this leads to a lower infrared value being measured at the sensor and intensifies the scenario described.
PRODUCTION SOLUTION
Not applicable.
SERVICE
WARRANTY
This TSB is informational only and not applicable to any Audi Warranty.
ADDITIONAL INFORMATION
All part and service references provided in this TSB (2063739) 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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