Conditions for Setting the DTC
WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
DTC B3948 01 and B3948 04
- The BCM detects an open/high resistance in the left front turn signal control circuit.
- The BCM detects an open/high resistance in the left front turn signal ground circuit.
DTC B3948 02
The BCM detects a short to ground in the left front turn signal control circuit.
DTC B3949 01 and B3949 04
- The BCM detects an open/high resistance in the right front turn signal control circuit.
- The BCM detects an open/high resistance in the right front turn signal ground circuit.
DTC B3949 02
The BCM detects a short to ground in the right front turn signal control circuit.