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) 31/B1000 or 31/B1100 could be caused by air bag sensor assembly malfunction.
NOTE:
If a DTC other than DTCs 31/B1000 or 31/B1100 is displayed at same time as DTCs 31/B1000 or 31/B1100, repair fault indicated by DTC other than DTCs 31/B1000 or 31/B1100 before using this procedure.