Buick Regal 2018-2026 Owners Manual / Vehicle Care / Electrical System
Buick Regal: Electrical System
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Electrical System Overload
The vehicle has fuses and circuit
breakers to protect against an
electrical system overload.
When the current electrical load is
too heavy, the circuit breaker opens
and closes, protecting the circui
Engine Compartment Fuse
Block
To remove the fuse block cover,
squeeze the three retaining clips on
the cover and lift it straight up.
Caution:
Spilling liquid on any electrical
component on the vehicle may
damage it. Always keep
Instrument Panel Fuse
Block
The instrument panel fuse block is
in the instrument panel, on the
driver side of the vehicle. To access
the fuses, press in on the sides of
the cover and pull to release it from
the instrument panel
SEE MORE:
Schematic Wiring Diagrams
HEADLIGHTS/DAYTIME RUNNING LIGHTS (DRL) WIRING SCHEMATICS
Controls and Indicators
Halogen Lamps and Daytime Running Lamps (T4A)
Left LED Headlamp Power, Ground and Serial Data (T4L)
Left LED Low Beam Lamps, Cornering Lamp and Cooling Fan (T4L)
Left LED High Beam Lamps, and High Beam Spot (T4L)
Symptoms - Lighting
NOTE: The following steps must be completed before using a symptom
table.
1. Perform the Diagnostic System Check - Vehicle before using a symptom table
in order to verify
that all of the following conditions are true:
There are no DTCs set.
The control modules can communicate via the serial dat
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