Schematic Reference: HVAC Schematics

Connector End View Reference: Component Connector End Views

Did you review the Air Delivery Description and Operation and the Air Temperature Description and Operation perform the necessary inspections?

Go to Step 2

Go to Symptoms - HVAC Systems - Manual

Operate the blower motor at each speed.

Does the blower motor operate at any speed?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

1. Disconnect the blower motor connector.
2. Connect a test lamp across the blower motor connector.
3. Start the engine.
4. Turn the blower switch to any position except OFF.

Does the test lamp light?

Go to Step 12

Go to Step 4

Test the blower motor supply voltage circuit for an open. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 16

Go to Step 5

Test the blower motor ground circuit for an open between the blower motor and S223. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 16

Go to Step 6

Test that the heater relay is open between terminals 3 and 5 and that there is continuity between terminals 3 and 4.

Did the relay test OK?

Go to Step 7

Go to Step 11

Test the heater relay coil and switch supply voltage circuits for an open. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 16

Go to Step 8

Test the heater relay control circuit for an open. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 16

Go to Step 9

Test the blower switch ground circuit for an open. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 16

Go to Step 10

Inspect for a poor connection at the harness connector of the blower switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 16

Go to Step 13

Inspect for a poor connection at the harness connector of the heater relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 16

Go to Step 14

Inspect for a poor connection at the harness connector of 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 16

Go to Step 15

Replace the blower switch.

Did you complete the replacement?

Go to Step 16

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Replace the heater relay. Refer to Blower Motor Relay Replacement .

Did you complete the replacement?

Go to Step 16

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Replace the blower motor. Refer to Blower Motor Replacement .

Did you complete the replacement?

Go to Step 16

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3