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Home >> Chevrolet >> 2021 >> Traverse High Country, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 68 (Driver Assistance Systems) >> Diagnostic Information and Procedures >> Lane Keep Assist System Malfunction (without UGN) >> 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.

Test 1

  1. Ignition OFF, disconnect the connector at the S26 Hazard Warning Switch.
  2. Verify a test lamp illuminates between ground circuit terminal 5 and B+
    • If the test lamp does not illuminate 

      Repair the open/high resistance on circuit 1450 or the ground connection.

    • Go to next step: If the test lamp illuminates 
  3. Ignition ON.
  4. Verify the scan tool Lane Departure Warning Switch Status parameter is Off.
    • If the parameter is not Off 
    1. Test circuit 3153 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 K9 Body Control Module.
    • Go to next step: If the parameter is Off 
  5. Connect a 3 A fused jumper wire between signal circuit terminal 7 and ground.
  6. Verify the scan tool Lane Departure Warning Switch Status parameter is On.
    • If the parameter is not On 
    1. Test circuit 3153 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. Replace the K9 Body Control Module.
    • Go to next step: If the parameter is On 
  7. Replace the S26 Hazard Warning Switch.

Test 2

  1. Ignition OFF, disconnect the X3 connector at the K9 Body Control Module, ignition ON.
  2. Verify the lane keep assist indicator is not illuminated.
    • If the indicator is illuminated 
    1. Test circuit 3152 for a short to voltage.
      • If a short to voltage is found, repair the fault on the circuit.
      • 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 indicator is not illuminated 
  3. Connect a 3 A fused jumper wire between control circuit terminal 13 and B+.
  4. Verify the lane keep assist indicator is illuminated.
    • Go to next step: If the indicator is not illuminated 
    1. Test circuit 1450 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit or the ground connection.
      • Go to next step: If an open/high resistance is not found
    2. Test circuit 3152 for a short to ground.
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found
    3. Test circuit 3152 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
    4. Replace the S26 Hazard Warning Switch.
    • If the indicator is illuminated 
  5. Replace the K9 Body Control Module.
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