Self-Diagnostic System: Notes
CAUTION:
Accessing self-diagnostics for 30 minutes without running engine will discharge battery, resulting in a possible no-start condition. To ensure proper operation, attach battery charger to battery.
NOTE:
Diagnostic trouble code tests are written specifically for use with GM Tech I or Tech II scan tools. Generic scan tool can be used but may have limited functions. This article only covers the portion of those systems which relates to charging system diagnosis.