GMC Sierra Owner's Manual page 7

6 Introduction
23. Data Link Connector (DLC) (Out of View).
See Malfunction Indicator Lamp (Check
Engine Light) 0 117.
24. Electric Parking Brake 0 247.
25. Fog Lamps 0 144 (If Equipped).
Instrument Panel Illumination Control
0 146.
Exterior Cargo Lamps 0 145.
Exterior Lamp Controls 0 140.
Task Lighting 0 145 (If Equipped).