Neutral/Start Switch
WARNING: This page is about a different car, the 1987 Toyota Cressida. However, it is still accessible from the selected car via links, so may be relevant.
A switch is installed on automatic transmission models to inform the ECU of transmission selection position. This information is used by the ECU to allow starter operation. This information is also relayed to the ECT computer. Manual transmission models are equipped with a clutch switch.