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Diagnostic Fault Information

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.
Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Headlamp Relay Control 1, 2 U1511 00, U1521 00 1, 2 -
Low Beam Headlamp Control - Left U1511 00 U1511 00 1 -
Low Beam Headlamp Control - Right U1521 00 U1521 00 1 -
High Beam Headlamp Control - Left U1511 00 U1511 00 2 -
High Beam Headlamp Control - Right U1521 00 U1521 00 2 -
Headlamp Switch Headlamps OFF Signal B257A 00 3 3 -
Headlamp Switch Headlamps ON Signal B257A 00 3 3 -
Turn Signal/Multifunction Switch Flash To Pass Signal B3806 00 4 4 -
Turn Signal/Multifunction Switch High Beam Signal B3650 08 4 4 -
Headlamp Ground - Left - 1 - -
Headlamp Ground - Right - 1 - -
Headlamp Switch Ground - 3 - -
Turn Signal/Multifunction Switch Ground - 4 - -
1. Headlamps Malfunction - Low Beam
2. Headlamps Malfunction - High Beam
3. Headlamp Switch Malfunction
4. Turn Signal/Multifunction Switch Malfunction