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Circuit/System Testing

WARNING: This page is about a different car, the 2016 Cadillac CT6. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the S48D Multifunction Switch 2 - Instrument Panel, ignition ON.
  2. Verify a test lamp illuminates between the control circuit terminal 3 and ground.
    • If the test lamp does not illuminate 
    1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
    2. Test for less than 2 Ω in the control circuit end to end.
    • If the test lamp illuminates 
  3. Ignition OFF, connect the harness connector at the S48D Multifunction Switch 2 - Instrument Panel. Disconnect the X1 harness connector at the B174W Frontview Camera - Windshield, ignition ON.
  4. Verify the lane departure warning switch indicator is not illuminated.
    • If the lane departure warning switch indicator is illuminated 
    1. Ignition OFF, disconnect the harness connector at the S48D Multifunction Switch 2 - Instrument Panel.
    2. Test for infinite resistance between the S48D Multifunction Switch 2 - Instrument Panel control circuit terminal 9 and ground.
      • If less than infinite resistance, repair the short to ground in the circuit.
      • If infinite resistance, replace the S48D Multifunction Switch 2 - Instrument Panel.
    • If the lane departure warning switch indicator is not illuminated 
  5. Connect a 3 A fused jumper wire between the control circuit terminal 4 and ground.
  6. Verify the lane departure warning switch indicator is illuminated.
    • If the lane departure warning switch indicator is not illuminated 
    1. Ignition OFF, disconnect the harness connector at the S48D Multifunction Switch 2 - Instrument Panel.
    2. Test for less than 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    3. Ignition OFF.
    4. 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 S48D Multifunction Switch 2 - Instrument Panel.
    • If the lane departure warning switch indicator is illuminated 
  7. Replace the B174W Frontview Camera - Windshield.
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