Self-Diagnostic System: Notes
NOTE:
DO NOT replace the 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 II 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.
Begin diagnosis of BCM by performing the diagnostic system check for the system in which the customer concern is apparent. The diagnostic system check will point to correct procedure within BCM section when a malfunction is present. See DIAGNOSTIC SYSTEM CHECK INDEX table.
DIAGNOSTIC SYSTEM CHECK INDEX