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Home >> GMC >> 2016 >> Terrain SL, Gas/Ethanol >> Repair and Diagnosis >> External Pages >> Different car >> Section 94 (Object Detection And Pedestrian Protection System) >> Diagnostic Information and Procedures >> Lane Departure Warning System Malfunction >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2015 GMC Terrain and 2015 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.

Lane Departure Warning Switch Malfunction

  1. Ignition OFF, disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 5 Ω between the S70L Steering Wheel Controls Switch - Left ground circuit terminal 7 and ground.
    • If 5 Ω or greater 
    1. 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.
    • If less than 5 Ω 
  3. Ignition ON.
  4. Verify the scan tool Lane Departure Warning Switch Status parameter is Open.
    • If not Open 
    1. Ignition OFF. Disconnect the K109 Frontview Camera Module.
    2. Test for infinite resistance between the S70L Steering Wheel Controls Switch - Left signal circuit terminal 2 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K109 Frontview Camera Module.
      • If Open 
  5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the ground circuit terminal 7.
  6. Verify DTC B356A 02 sets.
    • If DTC does not set 
    1. Ignition OFF, remove the jumper wire, 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 DTC sets 
  7. Test or replace the S70L Steering Wheel Controls Switch - Left.

Lane Departure Warning Switch Indicator Malfunction

  1. Ignition OFF, disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left, ignition ON.
    NOTE:

    Verify interior lighting dimming is turned all the way up.

  2. Test for 6.2-12.0 V between the dimming control circuit terminal 4 and ground.
    • If less than 6.2 V 
    1. Ignition OFF, disconnect the 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.
      • If infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
    • If greater than 12.0 V 
    1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1 V between the control circuit and ground.
    • If between 6.2-12.0 V 
  3. Connect a test lamp between the control circuit terminal 5 and the control voltage circuit terminal 4.
  4. Verify the test lamp turns ON and OFF when commanding the Lane Departure Warning Indicator parameter 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, ignition ON.
    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 S70L Steering Wheel Controls Switch - Left.
    • If the test lamp is always ON 
    1. Ignition OFF, disconnect the harness connector at the K109 Frontview Camera 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.
      • If infinite resistance, replace the K109 Frontview Camera Module.
    • If the test lamp turns ON and OFF 
  5. Test or replace the S70L Steering Wheel Controls Switch - Left.
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