LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 2014 >> SRX Base >> Repair and Diagnosis >> Accessories & Equipment >> Drivers Assistance Systems - ADAS >> Object Detection System >> Diagnostic Information and Procedures >> Lane Departure Warning System Malfunction >> Circuit/System Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit/System Testing

Lane Departure Switch Malfunction (without UGN)

  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 2 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 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 parameter is Inactive.
    • 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 10 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 
  5. Install a 3 A fused jumper wire between the signal circuit terminal 7 and ground.
  6. Verify the scan tool Lane Departure Warning Switch parameter is Active.
    • If not Active 
    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. 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 Active 
  7. Test or replace the S48E Multifunction Switch - Center Console.

Lane Departure Warning Switch Indicator (without UGN)

  1. Ignition OFF, and all vehicle systems OFF, disconnect the harness connector at the S48E Multifunction Switch - Center Console, ignition ON.
  2. Test for 1.7-3.6 V between the dimming control circuit terminal 3 and ground.
    NOTE:

    Verify interior lighting dimming is turned all the way up.

    • If less than 1.7 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 greater than 3.6 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 between 1.7-3.6 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 signal circuit terminal 10 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 signal circuit terminal 10 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 10 and S48E Multifunction Switch - Center Console terminal 7.
    • 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 cycling the lane departure warning switch.
    • If indicator does not turn on and off 

      Replace K109 Frontview Camera Module.

    • If indicator turns on and of  f
  10. All OK.

Lane Departure Warning Switch Malfunction (with UGN)

  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 2 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 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 parameter is Inactive.
    • If not Inactive 
    1. Ignition OFF, disconnect the harness connector X2 at the K124 Active Safety Control Module.
    2. Test for infinite resistance between the signal circuit terminal 16 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K124 Active Safety Control Module.
    • If Inactive 
  5. Install a 3 A fused jumper wire between the signal circuit terminal 7 and ground.
  6. Verify the scan tool Lane Departure Warning Switch parameter is Active.
    • If not Active 
    1. Ignition OFF, disconnect the X2 harness connector at the K124 Active Safety Control 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 K124 Active Safety Control Module.
    • If Active 
  7. Test or replace the S48E Multifunction Switch - Center Console.

Lane Departure Warning Switch Indicator (with UGN)

  1. Ignition OFF, and all vehicle systems OFF, disconnect the harness connector at the S48E Multifunction Switch - Center Console, ignition ON.
    NOTE:

    Verify interior lighting dimming is turned all the way up.

  2. Test for 1.6-3.6 V between the dimming control circuit terminal 3 and ground.
    • If less than 1.6 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 greater than 3.6 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 between 1.6-3.6 V 
  3. Ignition OFF, disconnect the X1 harness connector at the K124 Active Safety Control Module, ignition ON.
  4. Test for less than 1 V between the signal circuit terminal 3 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 signal circuit terminal 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 X1 harness connector at the K124 Active Safety Control Module terminal 3 and the S48E Multifunction Switch - Center Console circuit terminal 8.
    • 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 indicator turns ON and OFF when cycling the lane departure warning switch.
    • If indicator does not turn on and off 

      Replace K124 Active Safety Control Module.

    • If indicator turns on and of  f
  10. All OK.
scientia non olet · About LEMON Manuals