Mirror Switch Assembly Circuit Failure
The mirror control switch isn't communicating properly with the vehicle's electrical system, similar to a light switch that's broken and can't send the signal to turn lights on or off. The ECU detects this broken communication and stores the fault code.
The ECU monitors the voltage and resistance signals from the mirror switch assembly when buttons are pressed. It expects valid signal transitions within specific voltage ranges when the driver operates the mirror controls. If the signal is absent, erratic, or outside expected thresholds, the ECU logs a circuit failure.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Switch Signal Voltage | 0V to 5V with clean transitions | No signal, stuck voltage, or erratic fluctuation |
| Circuit Resistance | Less than 10 ohms per contact | Greater than 50 ohms or open circuit |
Code B2336 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, B2336 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.