S15/T15 Sonoma P/U 2WD L4-2.2L VIN 5 Flex Fuel (2001)
"For a description of the RPO Code(s) shown in this article or any of the images therein, refer to the RPO Code List found at Vehicle/Application ID".
See: Application and ID/RPO Codes
Radio/Audio System Schematics: Speakers (Chevy/GMC Crew Cab And Utility Except Envoy)