Possible Causes
WARNING: This page is about a different car, the 2003 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
DTC 87/B1165 could be caused by a short in circuit ICL+ (Yellow/Violet wire) and circuit ICL- (Yellow/Orange wire) in left side head impact air bag squib circuit, left side head impact air bag squib malfunction or air bag sensor assembly malfunction.
NOTE:
During testing, if DTCs other than DTC 87/B1165 are displayed, disregard them.