Has the HVAC Blower Controls System Check been performed?

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Go to Step 2

Go to HVAC Blower Controls System Check

1. Remove the auxiliary blower motor relay, medium.
2. Connect a fused jumper wire between cavities 1 and 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, medium. Refer to Auxiliary Blower Motor Relay Replacement .

Is the repair complete?

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Go to HVAC Blower Controls System Check

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1. Remove the auxiliary HVAC control modules, front and rear.
2. Connect a J 39200 (continuity) between pins B and E, and B and F of the front switch, and F and E of the rear switch.
3. Rotate the switch to Med.

Is continuity present?

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Go to Step 6

Go to Step 5

Replace the auxiliary HVAC control module. Refer to Auxiliary Air Conditioning (A/C) Control Assembly Replacement - Front or Control Assembly Replacement - Auxiliary .

Is the repair complete?

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Go to HVAC Blower Controls System Check

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1. Remove the auxiliary blower resistor connector.
2. Connect a J 39200 (continuity) between pins A and 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 HVAC 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, medium and splice S401. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to HVAC Blower Controls System Check

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Locate and repair the open in CKT 1925 (RED) between the auxiliary blower motor relay, medium and the auxiliary HVAC control modules. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to HVAC Blower Controls System Check

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