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 auxiliary blower motor relay, low.
2. Connect a fused jumper wire between cavity 1 and cavity 4 of the relay socket.

Does the blower motor run?

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Go to Step 3

Go to Step 4

Replace the auxiliary blower motor relay, low. Refer to Auxiliary Blower Motor Relay Replacement .

Is the repair complete?

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Go to Heater Blower Controls System Check

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1. Remove the auxiliary HVAC control module, front.
2. Connect a J 39200 (continuity) between pin B and pin E of the switch.
3. Rotate the switch to the Low position.

Is continuity present?

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Go to Step 6

Go to Step 5

Replace the auxiliary HVAC control module, front. Refer to Control Switch Replacement - Auxiliary .

Is the repair complete?

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Go to Heater Blower Controls System Check

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1. Remove the auxiliary blower resistor connector.
2. Connect a J 39200 (continuity) between pin C and pin B of the resistors connector.

Is continuity present?

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Go to Step 8

Go to Step 7

Replace the auxiliary blower resistor. Refer to Auxiliary Blower Motor Resistor Replacement .

Is the repair complete?

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Go to Heater Blower Controls System Check

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Connect a J 39200 (volts) between cavity 1 of the high relay socket and ground.

Is battery voltage present?

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Go to Step 10

Go to Step 9

Locate and repair the open in CKT 542 (RED) between cavity 1 of the auxiliary blower relay, low and splice S401. 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 open in CKT 1926 (DK BLU) between the auxiliary blower motor relay, low and the auxiliary HVAC control module, front. 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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