On-Vehicle Testing: Notes
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, 2003 Chevrolet Blazer, and 2002 GMC Sonoma. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
Vehicles are equipped with air bag supplemental restraint system. Before attempting any repairs involving steering column, instrument panel or related components, see DISABLING & ACTIVATING AIR BAG SYSTEM
in AIR BAG RESTRAINT SYSTEMS article in RESTRAINTS.
CAUTION:
When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES
article in GENERAL INFORMATION before disconnecting battery.
NOTE:
Before making electrical checks, visually inspect all terminals for clean, tight connections. Ensure all charging system related fuses and fusible links are okay. Check generator mounting bolts and drive belt tension. Ensure battery is fully charged and in good condition prior to testing charging system. Ensure starter is okay. See appropriate STARTERS article in ELECTRICAL.
NOTE:
Manufacturer recommends using Universal CS Generator Tester (J-41450-B) for testing charging system. Follow instructions provided with tester.