Activating System: Diagnostics
WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.
Turn ignition switch to LOCK position. Disconnect negative battery cable and wait at least 90 seconds. Reconnect all air bag system connectors and install removed components. Reconnect negative battery cable. Perform SYSTEM OPERATION CHECK