Sporadic Failure of Different Audio Channels
BMW technical service bulletin B651016 for 2014-2016 BMW 228I, 2017 BMW 230I and 2014-2016 BMW M235I and others.
- Bulletin number
- B651016
- Component
- Equipment: electrical: radio/tape deck/cd etc.
- Summary
- Sporadic Failure of Different Audio Channels. Intermittently, different speakers may be inoperative during an entire drive cycle until the vehicle enters sleep mode and the vehicle is restarted. Shut-down of output circuit(s) from pressure variations caused by door shutting during diagnostic self-test. After unlocking the vehicle the Harman Kardon (HK) Amplifier goes into a speaker self-test mode. If a door is slammed during this self-test vibrating the speaker cone, the HK amplifier may interpret the changing resistance of the speaker as a circuit failure. The HK Amplifier will then go into protection mode and turn off the output transistor(s) for the particular speaker(s) until the next selftest which is performed after the next sleep cycle.
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