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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 324 (Parking Assistance Systems) >> Diagnostic Information and Procedures >> Parking Assist System Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2022 Cadillac CT5. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X3 connector at the K9 Body Control Module.
  2. Test for infinite resistance between signal circuit terminal 31 and ground.
    • If less than infinite resistance 
    1. Test circuit 2555 for a short to ground.
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found
    2. Replace the S26 Hazard Warning Switch.
    • Go to next step: If infinite resistance 
  3. Test for less than infinite resistance between signal circuit terminal 31 and ground while pressing and holding the parking assist switch.
    • If infinite resistance 
    1. Test circuit 1450 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found
    2. Test circuit 2555 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found
    3. Replace the S26 Hazard Warning Switch.
    • Go to next step: If less than infinite resistance 
  4. Verify the parking assist indicator is not illuminated.
    • If the parking assist indicator is illuminated 
    1. Test circuit 5852 for a short to voltage.
      • If a short to voltage is found, repair the fault on circuit 5852.
      • Go to next step: If a short to voltage is not found
    2. Replace the S26 Hazard Warning Switch.
    • Go to next step: If the parking assist indicator is not illuminated 
  5. Connect a 3 A fused jumper wire between control circuit terminal 14 and B+.
  6. Verify the parking assist indicator is illuminated.
    • If the parking assist indicator is not illuminated 
    1. Test circuit 5852 for a short to ground.
      • If a short to ground is found, repair the fault on circuit 5852.
      • Go to next step: If a short to ground is not found
    2. Test circuit 5852 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on circuit 2555.
      • Go to next step: If an open/high resistance is not found
    3. Replace the S26 Hazard Warning Switch.
    • Go to next step: If the parking assist indicator is illuminated 
  7. Replace the K9 Body Control Module.
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