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Home >> GMC >> 2017 >> Acadia SL >> Repair and Diagnosis >> Accessories & Equipment >> Drivers Assistance Systems - ADAS >> Object Detection System And Pedestrian Protection System >> Diagnostic Information and Procedures >> Lane Departure Warning System Malfunction >> Circuit/System Testing

Circuit/System Testing

Lane Departure Warning Switch Circuit Malfunction

  1. Ignition OFF, disconnect the harness connector at the S70L Steering Wheel Control Switch - Left ignition ON.
  2. Verify a test lamp illuminates between the ignition circuit terminal 12 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 infinite resistance between the ignition circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the ignition circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, test or replace the K9 Body Control Module.
    • If the test lamp illuminates 
  3. Test for less than 1 V between the S70L Steering Wheel Control Switch - Left signal circuit terminal 10 and ground.
    • If 1 V or greater 
    1. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module.
    2. Test for less than 1 V between the signal circuit 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.
    • If less than 1 V 
  4. Ignition OFF.
  5. Test for greater than 100 Ω between the signal circuit terminal 10 and ground.
    • If 100 Ω or less 
    1. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K9 Body Control Module.
    • If greater than 100 Ω 
  6. Ignition On.
  7. Test for B+ between the ignition circuit terminal 12 and the signal circuit 10.
    • If less than B+ 
    1. Ignition OFF, disconnect the harness connector at the K109 Frontview Camera Module, ignition ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V.
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K109 Frontview Camera Module.
    • If B+ 
  8. Test or replace the S70L Steering Wheel Control Switch - Left

Lane Departure Warning Switch Indicator Circuit Malfunction

  1. Ignition OFF, and all vehicle systems OFF, disconnect the harness connector at the S70L Multifunction Switch - Instrument Panel, ignition ON.
  2. Verify a test lamp illuminates when placed between the PWM voltage control terminal 4 and ground.
    NOTE:

    Verify vehicle interior dimming control is set all the way bright.

    • If the test lamp illuminates 
  3. Connect a test lamp between the control circuit terminal 4 and control circuit terminal 11.
  4. Verify the test lamp turns ON and OFF when commanding the Lane Departure Warning Indicator On and Off with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, disconnect the harness connector at the K109 Frontview Camera Module.
    2. Test for infinite resistance between the voltage circuit and ground.
      • If less than infinite resistance, repair the short to ground in the circuit.
      • 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 K109 Frontview Camera Module.
    • If the test lamp is always ON 
    1. Ignition OFF, disconnect the harness connector at the K109 Frontview Camera Module, ignition ON.
    2. Test for less than 1 V between the voltage circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K109 Frontview Camera Module.
    • If the test lamp turns ON and OFF 
  5. Test or replace the S70L Steering Wheel Control Switch - Left
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