Circuit/System Testing

Lane Departure Warning Switch Circuit Malfunction

1. Ignition ON and all vehicle systems OFF, disconnect the harness connector at the S48A Multifunction Switch - Instrument Panel. It may take up to 2 min for all vehicle systems to power down.
2. Test for less than 10 Ω between the ground circuit terminal 14 and ground.
   • If 10 Ω or greater 
   1. Ignition OFF.
   2. 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 ground circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
   • If less than 10 Ω 
3. Verify the scan tool Lane Departure Warning Switch Status parameter is Open.
   • If not Inactive 
   1. Ignition OFF, disconnect the harness connector at the K109 Frontview Camera Module.
   2. Test for infinite resistance between the signal circuit terminal 8 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 Inactive 
4. Install a 3 A fused jumper wire between the signal circuit terminal 8 and ground.
5. Verify the scan tool Lane Departure Warning Switch Status parameter is Closed.
   • If not Closed 
   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. 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 
6. Test or replace the S48A Multifunction Switch - Instrument Panel.

Lane Departure Warning Switch Indicator Circuit Malfunction

1. Ignition OFF, disconnect the harness connector at the S48A Multifunction Switch - Instrument Panel, ignition ON.
2. Verify a test lamp illuminates between the control circuit terminal 2 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 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, refer to Interior Backlighting Malfunction .
   • If the test lamp illuminates 
3. Ignition OFF, connect the harness connector at the S48A Multifunction Switch - Instrument Panel. Disconnect the X1 harness connector at the K109 Frontview Camera Module, ignition ON.
4. Verify the lane departure warning switch indicator is not illuminated.
   • If the lane departure warning switch indicator is illuminated 
   1. Ignition OFF, disconnect the harness connector at the S48A Multifunction Switch - Instrument Panel.
   2. Test for infinite resistance between the S48A Multifunction Switch - Instrument Panel control circuit terminal 5 and ground.
      • If less than infinite resistance, repair the short to ground in the circuit.
      • If infinite resistance, replace the S48A Multifunction Switch - Instrument Panel.
   • If the lane departure warning switch indicator is not illuminated 
5. Connect a 3 A fused jumper wire between the control circuit terminal 5 and ground.
6. Verify the lane departure warning switch indicator is illuminated.
   • If the lane departure warning switch indicator is not illuminated 
   1. Ignition OFF, disconnect the harness connector at the S48A Multifunction Switch - Instrument Panel.
   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 S48A Multifunction Switch - Instrument Panel.
   • If the lane departure warning switch indicator is illuminated 
7. Replace the K109 Frontview Camera Module.