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Circuit/System Testing

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector : S48A Multifunction Switch - Instrument Panel
  3. Ignition/Vehicle - On
  4. Test for greater than 3 V between the test points : Control circuit terminal 5 & Ground
    • Go to next step : If greater than 3 V 
  5. Ignition/Vehicle & All vehicle systems - Off
  6. Connect the electrical connector : S48A Multifunction Switch - Instrument Panel
  7. Disconnect the electrical connector : B174W Frontview Camera - Windshield
  8. Ignition/Vehicle - On
  9. Verify the component is not activated : Lane Departure Warning Switch Indicator
    • If the component activates 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the electrical connector : S48A Multifunction Switch - Instrument Panel
    3. Test for infinite resistance between the test points : Control circuit terminal 7 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component : Lane Departure Warning Switch Indicator
    • Go to next step : If the component does not activate 
  10. Connect a 3 A fused jumper wire between the test points : Control circuit terminal 4 & Ground
  11. Verify the component activates : Lane Departure Warning Switch Indicator
    • If the component does not activate 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector : S48A Multifunction Switch - Instrument Panel
    3. Ignition/Vehicle - On
    4. Test for less than 1 V between the test points : Control circuit terminal 7 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step : If less than 1 V
    5. Test for less than 2 ohms between the test points : Control circuit terminal 7 @ Component harness & Control circuit terminal 4 @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component : S48A Multifunction Switch - Instrument Panel
    • Go to next step : If the component activates 
  12. Test or replace the component : B174W Frontview Camera - Windshield
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