LEMON Manuals: Even more car manuals for everyone
Home >> Cadillac >> 2018 >> XT5 Platinum >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Lighting System - Diagnostic Information And Procedures (DTC B093F - B3949) >> Diagnostic Information and Procedures >> DTC B3883 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, exterior lamps OFF, disconnect the appropriate components listed below. It may take up to 2 min for all vehicle systems to power down.
    • E7L License Plate Lamp - Left (with TC2)
    • E7R License Plate Lamp - Right (with TC2)
    • S46B Liftgate Unlatch Switch (with TB5)
  2. Test for less than 10 Ω between each ground circuit terminal listed below and ground.
    • E7L License Plate Lamp - Left terminal 2 (with TC2)
    • E7R License Plate Lamp - Right terminal 2 (with TC2)
    • S46B Liftgate Unlatch Switch terminal 1 (with TB5)
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 Ω 
  3. Connect a test lamp between the appropriate control circuit terminal listed below and ground, ignition ON.
    • E7L License Plate Lamp - Left terminal 1 (with TC2)
    • E7R License Plate Lamp - Right terminal 1 (with TC2)
    • S46B Liftgate Unlatch Switch terminal 3 (with TB5)
  4. Verify the test lamp turns ON and OFF when commanding the License Plate Lamps ON and OFF with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, disconnect the X7 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 X7 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 
  5. Test or replace the inoperative component.
scientia non olet · About LEMON Manuals