The seat's rearward adjustment switch isn't communicating properly with the car's computer, similar to a light switch that won't register when you flip it. This prevents the system from detecting when the driver moves the seat backward.
The ECU monitors the switch circuit voltage when the rearward button is pressed, expecting a signal transition from high to low. It detects circuit opens, shorts, or resistance values outside normal operating range, indicating a wiring or switch failure.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Switch Signal Voltage | 5V when released, 0V when pressed | Voltage remains constant or erratic; no transition detected |
| Circuit Resistance | 0-100 ohms (closed), >10k ohms (open) | Stuck intermediate resistance or open circuit |