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Home >> Buick >> 2018 >> Regal GS >> Repair and Diagnosis >> Accessories & Equipment >> Interior/Illumination Lights >> Lighting System - Diagnostic Information And Procedures (B388B-P0504) And Symptoms >> Diagnostic Information and Procedures >> DTC C0297 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the X2 harness connector at the K20 Engine Control Module.
  2. Connect a test lamp between the X2 harness connector terminal listed below and ground:
    • With LDE or 2H0 control circuit harness connector terminal 25
    • With LLU control circuit harness connector terminal 85
  3. Ignition ON, push and release the brake pedal. The test lamp should turn ON and OFF when changed between pushed an released brake pedal.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 Body Control Module.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
  4. If all circuits test normal, replace the K20 Engine Control Module.
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