Toyota Supra 2015 Wiring Diagram Manual page 190

SRS
The SRS has connectors which possess the functions described below:
198
1. SRS ACTIVATION PREVENTION MECHANISM
Each connector contains a short spring plate. When the
connector is disconnected, the short spring plate automatically
connects the power source and grounding terminals of the
squib to preclude a potential difference between the terminals.
2. ELECTRICAL CONNECTION CHECK MECHANISM
This mechanism is designed to electrically checks if
connectors are connected correctly and completely.
The electrical connection check mechanism is designed so
that the disconnection detection pin connects with the
diagnosis terminals when the connector housing lock is in to
locked condition.