Conditions For Setting Code
WARNING: This page is about a different car, the 1990 Cadillac Allante. However, it is still accessible from the selected car via links, so may be relevant.
DTC B120 will set if the ignition is on and the signal voltage indicates less than 5% (open or grounded CKT) or over 95% (shorted to voltage). During the time the failure is present a substitute delay time (minimum delay) will be implemented to allow continued operation of the twilight system. The reading from the potentiometer BD43 however, will display the actual reading.