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 5 Ω between the S48D Multifunction Switch 2 - Instrument Panel ground circuit terminal 2 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 S48D Multifunction Switch 2 - Instrument Panel signal circuit terminal 5 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. Connect the harness connector at S48D Multifunction Switch 2 - Instrument Panel. Ignition ON.
6. Verify the scan tool Lane Departure Warning Switch Status parameter while pressing and releasing the vehicle direction warning switch. The parameter should change between Open and Closed.
   • If the parameter does not change 

     Test or replace the S48D Multifunction Switch 2 - Instrument Panel.

   • If the parameter changes 
7. All OK.

Lane Departure Warning Switch Indicator Malfunction

1. Ignition OFF, disconnect the harness connector at the S48D Multifunction Switch 2 - Instrument Panel, 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 3 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 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, refer to Interior Backlighting Malfunction .
   • 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 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, refer to Interior Backlighting Malfunction .
   • If between 6.2-12.0 V 
3. Connect a test lamp between the control circuit terminal 6 and B+.
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 S48D Multifunction Switch 2 - Instrument Panel.
   • 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.