Has the Heater Blower Controls System Check been performed?

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Go to Step 2

Go to Heater Blower Controls System Check

1. Remove the high blower motor relay.
2. Place the ignition switch in the RUN position.
3. Place the blower motor switch in the OFF position.

Does the blower motor operate?

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Go to Step 3

Go to Step 4

Locate and repair the short to voltage in CKT 65 (PPL) between the high blower motor relay and the blower motor. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Heater Blower Controls System Check

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Connect a DMM (continuity) between pins C1 and A2 of the relay.

Is continuity present?

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Go to Step 5

Go to Step 6

Replace the high blower motor relay. Refer to Blower Motor Relay Replacement .

Is the repair complete?

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Go to Heater Blower Controls System Check

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1. Disconnect the HVAC control module connector C2.
2. Connect a DMM (volts) between cavity C2 of the high blower motor relay socket and ground.

Is voltage above the value given?

1 volt

Go to Step 7

Go to Step 8

Locate and repair the short to voltage in CKT 52 (ORN) between the blower switch and the blower motor relay high. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Heater Blower Controls System Check

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1. Disconnect the connector at the blower motor resistor.
2. Connect a DMM (volts) between cavity B2 of the high blower motor relay socket and ground.

Is voltage above the value given?

1 volt

Go to Step 9

Go to Step 10

Repair the short to voltage in CKT 101 (DK BLU) between the blower motor resistor and the high blower motor relay. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Heater Blower Controls System Check

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1. With the HVAC control module connector C2 disconnected. Connect DMM (continuity) between pin G and the remaining pins of the HVAC control module.
2. Ensure that the blower switch is in the OFF position.

Is continuity present between any pins expect pin D?

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Go to Step 11

Go to Step 12

Replace the heater control module or the HVAC control module. Refer to Blower Switch Replacement .

Is the repair complete?

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Go to Heater Blower Controls System Check

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With the blower resister and the HVAC control module connector C2 disconnected. Connect a DMM (volts) between pins A, C and D of the blower resister connector and ground.

Is voltage reading greater than the value given?

0.5 volts

Go to Step 13

Go to Step 14

Locate and repair the short to voltage in the circuit related to the pin tested. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Heater Blower Controls System Check

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Locate and repair the short to voltage within the blower resister. Refer Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Heater Blower Controls System Check

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