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Starter Generator Control Module Cooling Fan Inoperative

WARNING: This page is about a different car, the 2005 GMC Sierra and 2005 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Starter Generator Control Module Cooling Fan Inoperative

Step Action Yes No
Schematic Reference: Engine Cooling Schematics 
Connector End View Reference: Cooling System Connector End Views 
DEFINITION: The starter generator control module (SGCM) coolant fan motor does not operate.
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, command the coolant fan ON and OFF.
Does the engine coolant fan turn ON and OFF with each command?		 Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 3 
3
  1. Turn OFF the ignition.
  2. Remove the coolant fan relay.
  3. Probe the battery positive voltage circuit of the coolant fan relay switch side with a test lamp that is connected to a good ground.
Does the test lamp illuminate?		 Go to Step 4  Go to Step 7 
4 Connect a 20 A fused jumper wire between the battery positive voltage circuit and the coolant fan motor supply voltage circuit at the coolant fan relay.
Does the coolant fan operate?		 Go to Step 10  Go to Step 5 
5
  1. Disconnect the coolant fan motor connector.
  2. Probe the coolant fan motor supply voltage circuit at the harness connector with a test lamp that is connected to a good ground.
Does the test lamp illuminate?		 Go to Step 6  Go to Step 8 
6 Probe the harness connector of the coolant fan motor with a test lamp connected between the coolant fan motor supply voltage circuit and the ground circuit of the coolant fan motor.
Does the test lamp illuminate?		 Go to Step 11  Go to Step 9 
7 Repair the battery positive circuit of the coolant fan relay. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?		 Go to Step 14  -
8 Repair the supply voltage circuit of the coolant fan motor. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?		 Go to Step 14  -
9 Repair the ground circuit of the coolant fan motor. Refer to Circuit Testing andWiring Repairs in Wiring Systems.
Did you complete the repair?		 Go to Step 14  -
10 Inspect for poor connections at the coolant fan relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 14  Go to Step 12 
11 Inspect for poor connections at the harness connector of the coolant fan motor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 14  Go to Step 13 
12 Replace the coolant fan relay.
Did you complete the repair?		 Go to Step 14  -
13 Replace the coolant fan motor. Refer to Cooling Fan - Starter/Generator Control Module Replacement .
Did you complete the repair?		 Go to Step 14  -
14 Operate the system in order to verify the repair.
Did you correct the condition?		 System OK Go to Step 2 
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