Audio Navigation Mute Input Ckt Failure
The vehicle's audio system mute control circuit isn't communicating properly with the infotainment module. Think of it like a light switch that's broken—the signal to mute the radio isn't getting through.
The ECU monitors the mute input signal circuit from the infotainment control module, checking for proper voltage levels and circuit continuity. It expects a valid signal within specified voltage thresholds when mute is commanded. A fault occurs when the signal is absent, shorted, or outside expected parameters.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Mute Input Voltage | 0V (muted) to 5V (active) | Open circuit, short to ground, or no response detected |
| Circuit Continuity | Resistance <1 ohm when connected | Resistance >10 ohms or open circuit condition |
Code B2385 is a low-severity fault. Your vehicle is generally safe to drive to a workshop for diagnosis. However, do not ignore it indefinitely — low-severity codes often indicate developing problems that become expensive if neglected. Book a diagnostic appointment within 2–4 weeks. If you notice any additional symptoms (rough running, power loss, unusual smells), treat it as higher priority.
Once the fault is repaired, B2385 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.