2021 BMW Models Head Unit Resets Fault Code B7F8F9
A technical service bulletin addresses head unit resets in various 2021 BMW models, indicated by fault code B7F8F9 RESET WATCHDOG. Symptoms include interrupted radio, unavailable navigation, and a black control display. This issue affects the infotainment system.
David Chen2021 BMW 330i
Also applies to
- BMW 228i
- 2021
- BMW 330e
- 2021
- BMW 430i
- 2021
- BMW 530e
- 2021
- BMW 530i
- 2021
- BMW 540i
- 2021
- BMW 740i
- 2021
- BMW 840i
- 2021
- BMW M235i
- 2021
- BMW M340i
- 2021
- BMW M440i
- 2021
- BMW M5
- 2021
- BMW M550i
- 2021
- BMW M760i
- 2021
- BMW M8
- 2021
- BMW M850i
- 2021
- BMW X3
- 2021
- BMW X4
- 2021
- BMW X5
- 2021
- BMW X6
- 2021
- BMW X7
- 2021
- BMW Z4
- 2021
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Symptoms
Owners of affected 2021 BMW models may notice several issues related to the vehicle's infotainment system. These symptoms indicate a problem with the head unit's operation.
Key symptoms include:
- The active radio or music source is interrupted unexpectedly.
- The navigation system becomes unavailable, ceasing to provide directions or map display.
- A black screen is shown in the Control Display, rendering the infotainment system inoperable.
Fault Codes / DTCs
The primary diagnostic trouble code (DTC) associated with this issue is:
- B7F8F9: This fault code is described as a "RESET WATCHDOG" event, indicating an unexpected reset of the head unit's internal system.
Diagnosis / Trigger Conditions
The
Other revisions of this TSB
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