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Circuit/System Testing

WARNING: This page is about a different car, the 2016 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, and all vehicle systems OFF, disconnect the harness connector at the M96 Active Grille Air Shutter Actuator. 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 4 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 a test lamp illuminates between the ignition circuit terminal 1 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ignition circuit end to end.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the ignition circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the M96 Active Grille Air Shutter Actuator.
    • If the test lamp illuminates 
  5. Connect a test lamp between the control circuit terminal 2 and the ignition circuit terminal 1.
  6. Verify the test lamp turns On and Off when performing the Active Grille Air Shutter System test with a scan tool.
    • If the test lamp is always Off 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine 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 K20 Engine Control Module.
    • If the test lamp is always On 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine 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 K20 Engine Control Module.
    • If the test lamp turns On and Off 
  7. Ignition OFF, connector the harness connector at the M96 Active Grille Air Shutter Actuator. Disconnect the X3 harness connector at the K20 Engine Control Module, Ignition ON.
  8. Test for greater than 11 V between the control circuit terminal 55 and ground.
    • If 11 V or less 
    1. Vehicle OFF, disconnect the harness connector at the M96 Active Grille Air Shutter Actuator.
    2. 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 M96 Active Grille Air Shutter Actuator.
    • If greater than 11 V 
  9. Test or replace the M96 Active Grille Air Shutter Actuator.
  10. Verify DTC P151E is not set.
    • If the DTC is set 

      Replace the K20 Engine Control Module.

    • If the DTC is not set 
  11. All OK.
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