Schematic Reference: HVAC Schematics

DEFINITION: Air recirculation is inoperative or is always ON.

Did you perform the HVAC Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - HVAC Systems - Manual

1. Turn ON the ignition, with the engine OFF.
2. Place the blower motor switch in the maximum speed position.
3. Place the mode switch in the vent position.
4. Place the recirculation switch in the ON position.
5. Observe the recirculation door.
6. Place the outside air switch in the ON position.

Does the recirculation door move from the recirculation to the outside air position?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

Except for the blower motor speed, are all of the functions of the HVAC control module inoperative?

Go to Step 9

Go to Step 4

1. Turn OFF the ignition.
2. Disconnect the recirculation actuator.
3. Turn ON the ignition, with the engine OFF.
4. Probe the ignition 3 voltage circuit of the recirculation actuator with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 5

Go to Step 15

Test the ground circuit of the recirculation actuator for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 18

Go to Step 6

1. Reconnect the recirculation actuator.
2. Disconnect the HVAC control module.
3. Observe the recirculation door.
4. Connect a 3 amp fused jumper between the recirculation door control circuit and the ground circuit.

Does the recirculation door move into the outside air position?

Go to Step 14

Go to Step 7

Test the recirculation door control circuit of the recirculation actuator for an open, high resistance, short to ground, or short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 18

Go to Step 8

Inspect the recirculation door and the recirculation actuator for the following conditions:

Did you find and correct the condition?

Go to Step 18

Go to Step 13

9

Test the ignition 3 voltage circuit of the HVAC control module for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 18

Go to Step 10

Test the battery positive voltage circuit of the HVAC control module for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 18

Go to Step 11

Test the ground circuit of the HVAC control module for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 18

Go to Step 12

Test the off blower motor control circuit of the HVAC control module for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 18

Go to Step 14

Inspect for poor connections at the harness connector of the recirculation actuator. 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 18

Go to Step 16

Inspect for poor connections at the harness connector of the HVAC control module. 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 18

Go to Step 17

Repair the ignition 3 voltage circuit of the recirculation actuator. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 18

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Replace the recirculation actuator. Refer to Recirculation Actuator Replacement .

Did you complete the replacement?

Go to Step 18

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Replace the HVAC Control module. Refer to HVAC Control Module Replacement .

Did you complete the replacement?

Go to Step 18

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3