LEMON Manuals: Even more car manuals for everyone
Home >> Buick >> 2017 >> Regal Premium, FWD >> 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 Malfunction

  1. Ignition OFF, disconnect the harness connector at the S48D Multifunction Switch 2 - Instrument Panel. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 Ω between the S48D Multifunction Switch 2 - Instrument Panel ground circuit terminal 15 and ground.
    • If 10 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 10 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 S48D Multifunction Switch 2 - Instrument Panel signal circuit terminal 12 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 12 and ground circuit terminal 15.
  6. Verify the scan tool Lane Departure Warning Switch Status parameter is Closed.
    • If not Closed 
    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. Ignition OFF
    4. 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 Closed 
  7. Test or replace the S48D Multifunction Switch 2 - Instrument Panel.

Lane Departure Warning Switch Indicator Circuit Malfunction

  1. Ignition OFF, disconnect the harness connector at the S48D Multifunction Switch 2 - Instrument Panel, ignition ON.
  2. Verify a test lamp illuminates when placed between the PWM voltage control terminal 14 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 PWM voltage control circuit terminal 14 and the control circuit terminal 9
  4. Verify the test lamp turns ON and OFF while commanding the Lane Departure Warning Switch Indicator output control 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 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 K109 Frontview Camera Module.
    • 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 S48D Multifunction Switch 2 - Instrument Panel.
scientia non olet · About LEMON Manuals