Buick Regal 2018-2025 Owners Manual / Lighting
Buick Regal: Lighting
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Exterior Lamp Controls
The exterior lamp control is on the
instrument panel to the left of the
steering column.
There are four positions.
: Turns the exterior lamps off and
deactivates the AUTO mode. Turn
to again to r
Automatic Headlamp
System
When the exterior lamp control is
set to AUTO and it is dark enough
outside, the headlamps come on
automatically.
There is a light sensor on top of the
instrument panel. Do not cover the
sensor; othe
SEE MORE:
DTC C056D
Diagnostic Instructions
Perform the Diagnostic System Check prior to using this diagnostic
procedure:Diagnostic System
Check - Vehicle
Review the description of Strategy Based Diagnosis:Strategy Based
Diagnosis
An overview of each diagnostic category can be found here:Diagnostic
Procedure
Positive Crankcase Ventilation Valve Replacement
Preliminary Proced80ure
Intake Manifold Cover Replacement.
NOTE: Inspect each component while attached to the camshaft cover.
Do not remove the PCV
components unless inspection indicates a suspect component. Replace the PCV
valve, PCV
tube assembly, and PCV hose fitting as an assembly. The connec
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