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Home >> Chevrolet >> 2021 >> Traverse Premier, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 68 (Driver Assistance Systems) >> Diagnostic Information and Procedures >> DTC U1604 or U1605 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2020 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the connector at the B218L Side Obstacle Detection Control Module - Left and the B218R Side Obstacle Detection Control Module - Right, ignition ON.
  2. Test for less than 1 V between serial data circuit terminal 1 and ground.
    • If 1 V or greater 

      Repair the short to voltage on circuit 4087.

    • Go to next step: If less than 1 V 
  3. Test for less than 1 V between serial data circuit terminal 2 and ground.
    • If 1 V or greater 

      Repair the short to voltage on circuit 4087.

    • Go to next step: If less than 1 V 
  4. Ignition OFF.
  5. Test for infinite resistance between serial data circuit terminal 1 and ground.
    • If less than infinite resistance 

      Repair the short to ground on circuit 4087.

    • Go to next step: If infinite resistance 
  6. Test for infinite resistance between serial data circuit terminal 2 and ground.
    • If less than infinite resistance 

      Repair the short to ground on circuit 4088.

    • Go to next step: If infinite resistance 
  7. Test for less than 2 Ω between terminal 1 at the B218L Side Obstacle Detection Control Module - Left and terminal 1 at the B218R Side Obstacle Detection Control Module - Right.
    • If 2 Ω or greater 

      Repair the open/high resistance on circuit 4087.

    • Go to next step: If less than 2 Ω 
  8. Test for less than 2 Ω between terminal 2 at the B218L Side Obstacle Detection Control Module - Left and terminal 2 at the B218R Side Obstacle Detection Control Module - Right.
    • If 2 Ω or greater 

      Repair the open/high resistance on circuit 4087.

    • Go to next step: If less than 2 Ω 
  9. Connect the connector at the B218L Side Obstacle Detection Control Module - Left and the B218R Side Obstacle Detection Control Module - Right, ignition ON.
  10. Clear DTCs.
  11. Operate the vehicle within the Conditions for Running the DTC.
  12. Verify DTC U1604 or U1605 is not set.
    • If DTC U1604 is set 

      Replace the B218R Side Obstacle Detection Control Module - Right.

    • If DTC U1605 is set 

      Replace the B218L Side Obstacle Detection Control Module - Left.

    • Go to next step: If DTC U1604 or U1605 is not set 
  13. A fault is currently not present and may be an intermittent condition.
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