Blower Motor Inoperative. Chevrolet Colorado Pickup

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2006 🢒 Colorado Pickup - 2WD 🢒 HVAC 🢒 HVAC Systems - Manual 🢒 Blower Motor Inoperative

Test Description

The numbers below refer to the step numbers on the diagnostic table.

The IGN 3 relay, HVAC A fuse and the blower motor are in a series circuit. The test lamp should illuminate if there is no concern with the series circuit.

Probe the ground circuit of the blower motor switch in the HVAC control assembly.

Step	Action	Yes	No
Schematic Reference: HVAC Schematics Connector End View Reference: HVAC Connector End Views DEFINITION: The blower motor is inoperative in all speed positions.
1	Did you perform the Diagnostic System Check - Vehicle?	Go to Step 2	Go to Diagnostic System Check - Vehicle
2	Turn ON the ignition, with the engine OFF. Place the blower motor switch in each speed position. Does the blower motor operate in any speed position?	Go to Blower Motor Malfunction	Go to Step 3
3	Turn OFF the ignition. Disconnect the blower motor. Turn ON the ignition, with the engine OFF. Probe the blower motor supply voltage circuit of the blower motor with a test lamp that is connected to a good ground. Does the test lamp illuminate?	Go to Step 6	Go to Step 4
4	Probe the HVAC A fuse with a test lamp connected to a good ground. Does the test lamp illuminate?	Go to Step 12	Go to Step 5
5	Disconnect the ignition 3 relay. Probe the battery positive circuit of the ignition 3 relay with a test lamp connected to a good ground. Does the test lamp illuminate?	Go to Step 15	Go to Step 9
6	Place the blower motor switch to the maximum speed position. Connect a test lamp between the blower motor supply voltage circuit and the blower motor high control circuit of the blower motor. Does the test lamp illuminate?	Go to Step 13	Go to Step 7
7	Connect the blower motor. Disconnect the HVAC control assembly. Connect a test lamp between the blower motor high control circuit of the HVAC control assembly and a good ground. Does the test lamp illuminate?	Go to Step 8	Go to Step 10
8	Connect a test lamp between the ground circuit of the HVAC control assembly and battery positive voltage circuit. Does the test lamp illuminate?	Go to Step 14	Go to Step 11
9	Repair the battery positive circuit of the ignition 3 relay for an open. Refer to Wiring Repairs . Did you complete the repair?	Go to Step 18	--
10	Repair the blower motor high control circuit of the HVAC control assembly for an open. Refer to Wiring Repairs . Did you complete the repair?	Go to Step 18	--
11	Test the ground circuit for an open and a high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	Go to Step 18	Go to Step 14
12	Repair the blower motor supply voltage circuit of the blower motor. Refer to Wiring Repairs . Did you complete the repair?	Go to Step 18	--
13	Inspect for poor connections at the blower motor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	Go to Step 18	Go to Step 16
14	Inspect for poor connections at the HVAC control assembly. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	Go to Step 18	Go to Step 17
15	Replace the ignition 3 relay. Did you complete the replacement?	Go to Step 18	--
16	Replace the blower motor. Refer to Blower Motor Replacement . Did you complete the replacement?	Go to Step 18	--
17	Replace the HVAC control assembly. Refer to Heater and Air Conditioning Control Replacement . Did you complete the replacement?	Go to Step 18	--
18	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 2