Circuit/System Testing

Lane Departure Warning Switch Malfunction

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S48E Multifunction Switch - Center Console. 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 9 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 harness connector at the K109 Frontview Camera Module.
   2. Test for infinite resistance between the S48E Multifunction Switch - Center Console signal circuit terminal 7 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 7 and ground.
6. Verify DTC B356A 02 sets in approximately 10s.
   • 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 S48E Multifunction Switch - Center Console.

Lane Departure Warning Switch Indicator Malfunction

1. Ignition OFF, and all vehicle systems OFF, disconnect the harness connector at the S48E Multifunction Switch - Center Console, ignition ON.
2. Test for 9.1 - 12.6 V between the dimming control circuit terminal 8 and ground.
   NOTE:

   Verify interior lighting dimming is turned all the way up.

   • If less than 9.1 V 
   1. Ignition OFF, disconnect the X1 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 12.6 V 
   1. Ignition OFF, disconnect the X1 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 9.1-12.6 V 
3. Ignition OFF, disconnect the harness connector at the K109 Frontview Camera Module, ignition ON.
4. Test for less than 1 V between the control circuit terminal 6 and ground.
   • If 1 V or greater 

     Repair the short to voltage on the circuit.

   • If less than 1 V 
5. Ignition OFF.
6. Test for infinite resistance between the control circuit terminal 6 and ground.
   • If less than infinite resistance 

     Repair the short to ground on the circuit.

   • If infinite resistance 
7. Test for less than 5 Ω between the K109 Frontview Camera Module terminal 4 and S48E Multifunction Switch - Center Console circuit terminal 6.
   • If greater than 5 Ω 

     Repair the open/high resistance in the circuit.

   • If less than 5 Ω 
8. Test or replace the S48E Multifunction Switch - Center Console.
9. Verify the lane departure switch Indicator turns ON and OFF when pressing and releasing the lane departure warning switch.
   • If indicator does not turn on and off 

     Replace K109 Frontview Camera Module.

   • If indicator turns on and off 
10. All OK.