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Home >> GMC >> 2018 >> Acadia SL >> Repair and Diagnosis >> External Pages >> Different car >> Section 329 (Object Detection System And Pedestrian Protection System) >> Diagnostic Information and Procedures >> Lane Departure Warning System Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.

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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