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Home >> Chevrolet >> 2021 >> Traverse Premier, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 68 (Driver Assistance Systems) >> Diagnostic Information and Procedures >> Forward Collision Alert System Malfunction (without UGN) >> Circuit/System Testing
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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 X2 and X4 connectors at the K9 Body Control Module, Ignition ON.
  2. Test for less than 1 V between signal circuit terminal 13 X2 and ground.
    • If 1 V or greater 

      Repair the short to voltage on circuit 5737.

    • Go to next step: If less than 1 V 
  3. Ignition OFF
  4. Test for infinite resistance between signal circuit terminal 13 X2 and ground.
    • If less than infinite resistance 
    1. Test circuit 5737 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 S70L Cruise Control Switch.
    • Go to next step: If infinite resistance 
  5. Test for 14.0 k to 14.5 kΩ between signal circuit terminal 13 X2 and low reference circuit terminal 3 X4.
    • If not between 14.0 k and 14.5 kΩ 
    1. Test circuit 5737 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
    2. Test circuit 1449 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 S70L Cruise Control Switch.
    • Go to next step: If between 14.0 k and 14.5 kΩ 
  6. Test for 3.3 k to 3.7 kΩ between signal circuit terminal 13 X2 and low reference circuit terminal 3 X4 while pressing and holding the adaptive cruise control gap switch.
    • If not between 3.3 k and 3.7 kΩ 

      Replace the S70L Cruise Control Switch.

    • Go to next step: If between 3.3 k and 3.7 kΩ 
  7. Replace the K9 Body Control Module.

Test 2

  1. Ignition OFF, disconnect the connector at the P43 Collision Alert Indicators.
  2. Verify a test lamp illuminates between ground circuit terminal 4 and B+
    • If the test lamp does not illuminate 

      Repair the open/high resistance on circuit 1351 or the ground connection.

    • Go to next step: If the test lamp illuminates 
  3. Ignition ON.
  4. Verify a test lamp illuminates between ignition circuit terminal 1 and ground.
    • If the test lamp does not turn illuminate and the circuit fuse is OK 
    1. Ignition OFF, remove the test lamp.
    2. Test circuit 1839 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. Verify the fuse is OK and there is voltage at the fuse. Refer to Power Mode Mismatch .
    • If the test lamp does not turn On and the circuit fuse is open 
    1. Ignition OFF, remove the test lamp.
    2. Test circuit 1839 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
      3. NOTE:

      Use the schematic to identify components and control modules that utilize circuit 1839 as a power source.

    3. Determine the appropriate control module or component that is causing an excessive current draw on circuit 1839.
    • Go to next step: If the test lamp illuminates 
  5. Ignition OFF, disconnect the X1 connector at the P16 Instrument Panel Cluster Control Module, ignition ON.
  6. Test for less than 1 V between control circuit terminal 11 at the P16 Instrument Panel Cluster Control Module connector and ground.
    • If 1 V or greater 

      Repair the short to voltage on circuit 4787.

    • Go to next step: If less than 1 V 
  7. Test for less than 1 V between control circuit terminal 12 at the P16 Instrument Panel Cluster Control Module connector and ground.
    • If 1 V or greater 

      Repair the short to voltage on circuit 3885.

    • Go to next step: If less than 1 V 
  8. Ignition OFF.
  9. Test for infinite resistance between control circuit terminal 11 at the P16 Instrument Panel Cluster Control Module connector and ground.
    • If less than infinite resistance 

      Repair the short to ground on circuit 4787.

    • Go to next step: If infinite resistance 
  10. Test for infinite resistance between control circuit terminal 12 at the P16 Instrument Panel Cluster Control Module connector and ground.
    • If less than infinite resistance 

      Repair the short to ground on circuit 3885.

    • Go to next step: If infinite resistance 
  11. Test for less than 2 Ω between control circuit terminal 11 at the P16 Instrument Panel Cluster Control Module connector and control circuit terminal 3 at the P43 Forward Collision Alert Displayconnector.
    • If 2 Ω or greater 

      Repair the open/high resistance on circuit 4787.

    • Go to next step: If less than 2 Ω 
  12. Test for less than 2 Ω between control circuit terminal 12 at the P16 Instrument Panel Cluster Control Module connector and control circuit terminal 2 at the P43 Forward Collision Alert Displayconnector.
    • If 2 Ω or greater 

      Repair the open/high resistance on circuit 3885.

    • Go to next step: If less than 2 Ω 
  13. Replace the P43 Collision Alert Indicators.
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