Memory 2 Switch Circuit Failure
The vehicle's memory seat switch (usually the passenger seat memory function) isn't communicating properly with the control module, like a light switch that isn't sending a signal back to confirm it's working. The ECU detects an open or shorted circuit in the circuit that controls or reads this switch.
The ECU monitors the voltage signal and continuity of the Memory 2 Switch circuit, expecting a clean on/off signal or specific voltage levels when the switch is pressed. If the circuit reads an unexpected voltage, excessive resistance, or an open/short condition for a set duration, the fault is triggered.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Switch Signal Voltage | 0V (off) or 12V (on), clean transitions | Stuck voltage, floating signal, or out-of-range reading |
| Circuit Resistance | Less than 5 ohms when closed, infinite when open | Erratic or intermediate resistance indicating corrosion or loose connection |
Code B1535 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, B1535 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.