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Lighting Systems Diagnostic System Check

  1. Retrieve and display DTCs by entering Body Control Module (BCM) using SECURITY indicator diagnostic mode. See RETRIEVING BODY CONTROL MODULE DIAGNOSTIC TROUBLE CODES . If diagnostic mode is entered and DTCs are retrieved, go to next step. If diagnostic mode cannot be entered, perform TEST C: CANNOT ENTER BODY CONTROL MODULE DIAGNOSTICS  under SYSTEM TESTS.
  2. If both DTCs 12 and 55 are retrieved, go to next step. If either DTCs 12 and 55 are not retrieved, perform TEST C: CANNOT ENTER BODY CONTROL MODULE DIAGNOSTICS  under SYSTEM TESTS.
  3. If DTCs 21/31 or DTCs 22/32 are not retrieved, go to next step. If DTCs 21/31 or DTCs 22/32 are retrieved, perform appropriate test in accordance with DTC retrieved. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
  4. If any other DTCs are retrieved, perform appropriate test in accordance with DTC retrieved. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If other DTCs are not retrieved, repair courtesy lights as necessary. See ILLUMINATION/INTERIOR LIGHTS article.
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