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Home >> Chevrolet >> 2013 >> Traverse LS, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 170 (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 2015 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.

Inoperative in All Speeds

  1. Ignition OFF, disconnect the harness connector at the G10 Cooling Fan Motor.
  2. Verify a test lamp illuminates between the ground circuit terminal 1 and B+
    • If the test lamp does not illuminate 
    1. Ignition OFF, remove the test lamp.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If the test lamp illuminates 
  3. Test or replace the G10 Cooling Fan Motor. Replace the cooling fan fuses if necessary.

Low, Medium or High Speed Inoperative

  1. Ignition OFF, disconnect the following relays:
    • KR20C Cooling Fan Low Speed Relay
    • KR20D Cooling Fan High Speed Relay
    • KR20P Cooling Fan Medium Speed Relay
  2. Verify a test lamp illuminates between ground and each of the cooling fan relay B+ circuit terminals listed below:
    • KR20C Cooling Fan Low Speed Relay terminal 87
    • KR20D Cooling Fan High Speed Relay terminal 87
    • KR20P Cooling Fan Medium Speed Relay terminal 87
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF, remove the test lamp.
    2. Test for less than 2 Ω in the appropriate relay B+ circuit, end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, 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. Ignition OFF, disconnect the harness connector at the G10 Cooling Fan Motor.
    2. Test for infinite resistance between the appropriate relay controlled output circuit terminal listed below and ground:
      • KR20C Cooling Fan Low Speed Relay terminal 30
      • KR20D Cooling Fan High Speed Relay terminal 30
      • KR20P Cooling Fan Medium Speed Relay terminal 30
      • If less than infinite resistance, repair the short to ground in the circuit.
      • If infinite resistance, test or replace the G10 Cooling Fan Motor, replace the fuse as necessary.
      • If the test lamp illuminates 
    3. NOTE:

    The KR20C Cooling Fan Low Speed Relay is controlled through the switch side of the KR20F Cooling Fan Relay.

  3. Ignition ON, command the cooling fan ON at low speed.
  4. Connect a test lamp between B+ and the KR20C Cooling Fan Low Speed Relay control circuit terminal 86. The test lamp should illuminate.
    • If the test lamp does not illuminate 
    1. Disconnect the X50A Fuse Block - Underhood harness connector.
    2. Test for less than 2 Ω between Fuse Block harness connector terminal X1-48 and ground.
      • If greater than 2 Ω, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the X50A Fuse Block - Underhood.
    • If the test lamp illuminates 
    5. NOTE:

    The ignition voltage for the KR20D Cooling Fan High Speed Relay coil is supplied through the switch side of the KR20E Cooling Fan Speed Control Relay.

  5. Ignition ON, command the cooling fan ON at high speed.
  6. Connect a test lamp between ground and the KR20D Cooling Fan High Speed Relay coil ignition voltage terminal 85. The test lamp should illuminate.
    • If the test lamp does not illuminate 
    • Replace the X50A Cooling Fan Speed Control Relay
    • If the test lamp illuminates 
  7. Ignition OFF, install the previously removed cooling fan relays.
  8. Ignition ON, connect a test lamp between ground and the cooling fan circuit terminals listed below. Command the cooling fan ON at High speed. The test lamp should illuminate at each terminal.
    • R10A Cooling Fan Resistor - Low Speed terminal 1
    • R10B Cooling Fan Resistor - Medium Speed terminal 1
    • G10 Cooling Fan Motor B+ supply circuit terminal 2
    • If the test lamp does not illuminate 
    1. Test for less than 2 Ω between the appropriate cooling fan relay controlled output circuit end to end.
    • If greater than 2 Ω, repair the open/high resistance in the circuit.
    • If less than 2 Ω, test or replace the appropriate KR20 Cooling Fan Relay.
    • If the test lamp illuminates 
  9. Ignition OFF, connect the harness connectors to the cooling fan resistors.
  10. Ignition ON, connect a test lamp between ground and the G10 Cooling Fan Motor B+ supply circuit terminal 2. Command the cooling fan ON at Low and Medium speed. The test lamp should illuminate as commanded in each speed.
    • If the test lamp does not illuminate 
    1. Test for less than 2 Ω between the G10 Cooling Fan Motor B+ supply circuit terminal 2 and the appropriate R10 Cooling Fan Resister terminal 2
      • If greater than 2 Ω, repair the open/high resistance in the circuit.
      • If less than 2 Ω, test or replace the appropriate R10 Cooling Fan Resistor.
    • If the test lamp illuminates 
  11. If all of the circuits and components test normal, test or replace the G10 Cooling Fan Motor.
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