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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 minutes 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 6.2 - 12.0 V between the dimming control circuit terminal 8 and ground.
    NOTE:

    Verify interior lighting dimming is turned all the way up.

    • If less than 6.2 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 greater than 12.0 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 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 S48E Multifunction Switch - Center Console.
    • 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 S48E Multifunction Switch - Center Console.
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