Buick Regal 2018-2026 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 B3948 or B3949
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diagnostic Procedure Instructions provides an overview of each
diagnostic category.
DTC Descriptors
D
Description and Operation
CRUISE CONTROL DESCRIPTION AND OPERATION (WITHOUT ADAPTIVE CRUISE
CONTROL)
DD - Serial Data - GMLAN High Speed
K20 - K20 Engine Control Module
S70L - S70L Steering Wheel Controls Switch - Left
P16 - P16 Instrument Cluster
K9 - K9 Body Control Module
Cruise control is a speed control system that mai
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