Possible Causes
WARNING: This page is about a different car, the 2002 Lexus RX 300. However, it is still accessible from the selected car via links, so may be relevant.
DTC 16/B1158 or B1159 could be causes by an open or short circuit between front air bag sensor and air bag sensor assembly, short to battery in front air bag sensor circuit, or front air bag sensor malfunction.
NOTE:
Front air bag sensor circuit Brown wire becomes Black wire at short connector. Front air bag sensor circuit White/Red wire becomes White wire at short connector. Short connector is located high under left side of instrument panel and is not included in manufacturer"s diagnostics.