Self-Diagnostic System: Notes
WARNING:
Vehicles are equipped with Supplemental Inflatable Restraint (SIR) system. Before attempting any repairs involving steering column, instrument panel or related components, see SERVICE PRECAUTIONS and DISABLING & ACTIVATING AIR BAG SYSTEM in appropriate AIR BAG RESTRAINT SYSTEMS article.
CAUTION:
Electronic modules are sensitive to static electrical charges. Proper grounding of technician and workplace is essential to prevent damage.
CAUTION:
When using scan tool, exit all scan tool tests before cycling ignition switch from LOCK to RUN position unless scan tool instructions indicate otherwise. Follow all scan tool manufacturer's instructions, or diagnostic trouble codes (actual or false) may set, vehicle systems may malfunction or scan tool may malfunction.
NOTE:
DO NOT replace Body Control Module (BCM) unless a DTC remains current after all DTC repair procedures have been performed. DO NOT replace BCM based on history DTCs.
NOTE:
Self-diagnostic system checks were written specifically for use with Tech 2 scan tool. Other generic scan tools can be used, but may have limited functions.
Body Control Module (BCM) is equipped with a self-diagnostic system, which detects system DTCs or abnormalities. When a malfunction occurs, BCM will store a DTC. Malfunctions are recorded as history/intermittent failures or as current failures. Current DTCs indicate BCM has detected a fault which is currently present. A history DTC indicates that BCM has previously detected a malfunction that is not currently present.