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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 162 (Data Communications - Diagnostic Information And Procedures (2 Of 3)) >> Diagnostic Information and Procedures >> DTC U160C >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:

Use the schematics and connector end views to identify the device's ground, B+, ignition, and serial data circuit terminals.

  1. Ignition ON/Vehicle In Service Mode.
  2. Verify the K182 Parking Assist Control Module is not communicating.
    • If the device is still communicating 
    1. Ignition/Vehicle OFF, disconnect all the harness connectors at the K182 Parking Assist Control Module.
    2. Ignition ON/Vehicle In Service Mode, refer to step 8 to diagnose a fault in the serial data circuits.
    • Go to next step: If the device is not communicating 
  3. Ignition/Vehicle OFF, disconnect all the harness connectors at the K182 Parking Assist Control Module.
  4. Verify a test lamp illuminates between each of the ground circuit terminals and B+.
    • If the test lamp does not illuminate 

      Repair the open/high resistance in the ground circuit or ground connection.

    • Go to next step: If the test lamp illuminates 
  5. Ignition ON/Vehicle In Service Mode.
  6. If equipped, verify a test lamp illuminates between each of the B+ circuit terminals and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Test for an open/high resistance in the B+ circuit.
      • If an open/high resistance is found, repair the fault in the circuit.
      • Go to next step: If an open/high resistance is not found
    2. Verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Test for a short to ground in the B+ circuit.
      • If a short to ground is found, repair the fault in the circuit.
      • Go to next step: If a short to ground is not found
    2. Replace the K182 Parking Assist Control Module.
    • Go to next step: If the test lamp illuminates 
  7. If equipped, verify a test lamp illuminates between each of the ignition circuit terminals, which has a fuse in the circuit, and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Test for an open/high resistance in the ignition circuit.
      • If an open/high resistance is found, repair the fault in the circuit.
      • Go to next step: If an open/high resistance is not found
    2. Verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Test for a short to ground in the ignition circuit.
      • If a short to ground is found, repair the fault in the circuit.
      • Go to next step: If a short to ground is not found
    2. Replace the K182 Parking Assist Control Module.
    • Go to next step: If the test lamp illuminates 
  8. Test for less than 4.5 V between each of the CAN 2 serial data circuit terminals and ground.
    • Go to next step: If less than 4.5 V 
  9. Ignition/Vehicle OFF, all access doors closed, all vehicle systems OFF, and all keys at least 3 m (9.8 ft) away from vehicle. It may take up to 10 min for all vehicle systems to power down.
  10. Test for greater than 100 Ω between each of the CAN 2 serial data circuit terminals and ground.
    • Go to next step: If greater than 100 Ω 
  11. Test for less than infinite resistance between each of the CAN 2 serial data circuit terminals and ground.
    • If infinite resistance 

      Repair the open/high resistance in the serial data circuit.

    • Go to next step: If less than infinite resistance 
    12. NOTE:

    The following test step is only applicable to a CAN device with 2 pairs of CAN 2 serial data circuits or a CAN device with an internal terminating resistor.

  12. Test for 110 - 130 Ω between each pair of the CAN 2 serial data circuits.
    • Go to next step: If between 110 - 130 Ω 
  13. Inspect both harness and component connectors for contamination, corrosion, and terminal tension.
  14. Reconnect the harness connectors at the K182 Parking Assist Control Module.
  15. Ignition ON/Vehicle In Service Mode.
  16. Verify the DTC is not set again.
    • If the DTC is set 

      Replace the K182 Parking Assist Control Module.

    • Go to next step: If the DTC is not set 
  17. A fault is currently not present and may be an intermittent condition.
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