Mirror Driver Left Circuit Short To Battery
The left side mirror's control circuit is shorted directly to the vehicle's battery, causing excessive current flow. Think of it like a wire touching a live terminal that shouldn't be—it creates an electrical short instead of normal controlled operation.
The ECU monitors the voltage and current draw of the left mirror driver circuit. It detects when the circuit voltage remains at or near battery voltage instead of the controlled PWM or relay signals needed for normal operation. A short to battery causes continuous high current that exceeds normal thresholds.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Circuit Voltage | 0-12V (controlled switching) | Sustained 12V+ (direct battery short) |
| Current Draw | 0.5-2A (motor operation) | >5A or sustained maximum draw |
Code B1633 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, B1633 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.