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Home >> Chevrolet >> 2020 >> Camaro SS, 2D Coupe, Automatic Trans >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Lighting System - Diagnostic Information And Procedures (B053A-B3949) >> Diagnostic Information and Procedures >> DTC B255D >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the appropriate component listed below.
    • E38 Flood Lamp - Center Console (without C70)
    • K126 Accent Lamp Control Module (with C70)
  2. Connect a test lamp between the appropriate control circuit terminal listed below and ground, ignition ON.
    • E38 Flood Lamp - Center Console terminal 1 (without C70)
    • K126 Accent Lamp Control Module terminal 5 (with C70)
  3. Verify the test lamp turns ON and OFF when commanding the Accent Lighting 2 ON and OFF with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
    • If the test lamp is always ON 
    1. Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1 V between the control circuit terminal and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K9 Body Control Module.
    • Go to next step: If the test lamp turns ON and OFF 
  4. Test or replace the accent lamp.
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