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Lane Keep Assist Switch Indicator Circuit Malfunction (with UGN)

WARNING: This page is about a different car, the 2016 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the S48C Multifunction Switch 1 - Instrument Panel.
  2. Ignition ON, test for 6.2-10.9 V between the dimming control circuit terminal 4 (-UV6) or terminal 3 (+UV6) and ground.
    NOTE: Verify interior lighting dimming is turned all the way up.
    • 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 in the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
    • If greater than 10.9 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 6.2-10.9 V 
  3. Connect a test lamp between the control circuit terminal 7 (-UV6) or terminal 8 (+UV6) and B+.
  4. Verify the test lamp turns ON and OFF when Commanding the lane keep assist Indicator ON and OFF with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, disconnect the harness connector at the K124 Active Safety 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
    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 S48C Multifunction Switch 1 - Instrument Panel.
    • If the test lamp is always ON 
    1. Ignition OFF, disconnect the harness connector at the K124 Active Safety 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, replace the K124 Active Safety Control Module.
    • If the test lamp turns ON and OFF 
  5. Test or replace the S48C Multifunction Switch 1 - Instrument Panel.
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