Diagnostic Trouble Code (DTC) Diagnosis

This section uses the following items in order to direct you in performing specific tests in order to locate and repair the problem:
^ Diagnostic tables
^ Wiring diagrams
^ Descriptive text

The diagnostic table is a step by step procedure used in order to determine the circuit or the component that is the source of the problem. The following items are located above the diagnostic table:
^ Wiring diagrams
^ Descriptive text
^ Test conditions
^ Failure conditions
^ Actions taken when a DTC is set

When the Diagnostic Trouble Codes (DTCs) are set, the BCM detects a malfunction in a particular circuit or other system. Other system malfunctions are generally (but not exclusively) reported to the BCM via Class 2 data message. The BCM is programmed with routines for internal checks that the BCM follows only under prescribed conditions (called test conditions). When these conditions exist, the BCM inspects certain circuits or systems for a malfunction. These inspections are called failure conditions or conditions for setting the DTC. When these conditions are true, a DTC is set. The BCM turns the SECURITY Malfunction Indicator Lamp (MIL) to the ON position for the Passlock system related malfunctions. Refer to the applicable DTC table for procedures and details.