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, high.
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, high. 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 D of the switch.
3. Rotate the switch to the HIGH 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 motor connector.
2. Connect a J 39200 (continuity) between cavity 4 of the high relay socket and cavity A of the blower connector.

Is continuity present?

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Go to Step 8

Go to Step 7

Locate and repair the open in CKT YEL (1172) between the auxiliary blower relay, high and splice S402. 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 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, high 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 1924 (WHT) between the auxiliary blower motor relay, high 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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