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Home >> Chevrolet >> 2012 >> Traverse LS, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 160 (Engine Cooling System) >> Diagnostic Information and Procedures >> Cooling Fan Inoperative >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2013 GMC Acadia, 2013 Chevrolet Traverse, and 2013 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the cooling fan relays.
  2. Connect a 30 A fused jumper between the relay switch circuit terminal 30 and the relay ground circuit terminal 87 at the speed control relay connector. This will complete the left side fan ground circuit. Leave this jumper in place for the remainder of this procedure.
    3. NOTE:

    The following test must be performed on both the right high speed fan relay circuit and the left high speed fan relay circuit.

  3. Ignition ON, verify that a test lamp illuminates between the relay switch B+ circuit terminal 30 and ground.
    • If the test lamp does not illuminate, test the appropriate relay switch B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the relay switch B+ circuit fuse is open, test the relay controlled output circuit for a short to ground. If the circuit tests normal, test or replace the appropriate cooling fan.
    4. NOTE:

    The following test must be performed first on the right high speed fan relay circuit and next on the left high speed fan relay circuit. Leave the jumper connected to the low speed fan relay circuit for the next test.

  4. Connect a 40 A fused jumper between the relay switch B+ circuit terminal 30 and the relay controlled output circuit terminal 87. Verify the appropriate fan is activated
    • If the appropriate fan does not activate, test the relay controlled output circuit for an open/high resistance. If the circuit tests normal, test the fan ground circuit for an open/high resistance. If the circuit tests normal, replace the appropriate cooling fan.
  5. Install the speed control relay. Verify both fans activate at low speed.
    • If both fans do not activate, test the relay controlled output circuit terminal 87A of the speed control relay for a short to ground or an open/high resistance.
  6. If all circuits test normal, test or replace speed control the relay.
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