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Circuit/System Testing

WARNING: This page is about a different car, the 2021 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the appropriate electrical connector: X1 @ X85 Steering Wheel Air Bag Coil
  3. Ignition - On / Vehicle - In Service Mode
  4. Test for less than 10 ohms between the test points: Low Reference circuit terminal 18 & Ground
    • If 10 ohms or greater 
    1. Disconnect the electrical connector: X1 @ K180 Driver Monitoring System Control Module
    2. Test for less than 2 ohms between the test points: Low Reference circuit terminal 18 @ Component harness & Terminal 7 X1 @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K180 Driver Monitoring System Control Module
    • Go to next step: If less than 10 ohms 
  5. Ignition - On / Vehicle - In Service Mode
  6. Test for less than 1 V between the test points: Control circuit terminal 17 & Ground
    • If greater than 1 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: X1 @ K180 Driver Monitoring System Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: Control circuit terminal 8 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component: K180 Driver Monitoring System Control Module
    • Go to next step: If less than 1 V 
  7. Ignition/Vehicle & All vehicle systems - Off
  8. Test for infinite resistance between the test points: Control circuit terminal 17 & Ground
    • If less than infinite resistance 

      Repair short to ground on the circuit.

    • Go to next step: If infinite resistance 
  9. Test for less than 2 ohms between the test points: Control circuit terminal 17 & The other end of the circuit
    • If greater than 2 ohms 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 2 ohms 
  10. Replace the component: P51 Lane Centering Indicators - Steering Wheel
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