DTC B1820/55 Short in Front Driver Side - Side Squib Circuit; DTC B1821/55 Open in Front Driver Side - Side Squib Circuit; DTC B1822/55 Short to GND in Front Driver Side - Side Squib Circuit; DTC B1823/55 Short to B+ in Front Driver Side - Side Squib Circuit: Wiring Diagram
WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.