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) 55/B1820, 55/B1821, 55/B1822 or 55/B1823 could be caused by a short to ground, open, short or short to battery in left side air bag squib circuit, squib malfunction or air bag sensor assembly malfunction.
NOTE:
During testing, if DTCs other than DTC 55/B1820, 55/B1821, 55/B1822 or 55/B1823 are displayed, disregard them.