Possible Causes
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.
Diagnostic Trouble Codes (DTCs) 54/B1815, 54/B1816, 54/B1817 or 54/B1818 could be caused by a short to ground, open, short or short to battery in No. 2 squib circuit, squib malfunction or air bag sensor assembly malfunction.
NOTE:
During testing, if DTCs other than DTC 54/B1815, 54/B1816, 54/B1817 or 54/B1818 are displayed, disregard them.