Was the Blower Controls System Check performed?

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Go to Step 2

Go to HVAC Blower Controls System Check

Inspect the HEATER BLOWER fuse.

Is the fuse open?

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Go to Step 3

Go to Step 4

Test the battery feed circuit to the blower control module (CKT A465) for a short to ground. Refer to Testing for Short to Ground in Wiring Systems.

Did you find a short to ground in the battery feed circuit?

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Go to Step 5

Go to Step 6

Remove the HEATER BLOWER fuse and test for voltage at the fuse block terminal (one terminal is hot at all times).

Is the voltage within the specified value?

11 - 13 V

Go to Step 7

Go to Step 8

1. Repair the short to ground. Refer to Wiring Repairs in Wiring Systems.
2. Replace the HEATER BLOWER fuse.

Is the repair complete?

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Go to Step 16

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The short to ground may be intermittent at this time. Refer to Testing for Electrical Intermittents in Wiring Systems. Replace the HEATER BLOWER fuse.

Did you replace the fuse?

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Go to HVAC Blower Controls System Check

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1. Reinstall the HEATER BLOWER fuse.
2. Remove the blower control module.
3. Connect the negative lead of the DMM to terminal 3 of the blower control module.
4. With the positive lead measure the voltage at terminal 1 of the blower control module.

Is the voltage within the specified value?

11 - 13 V

Go to Step 9

Go to Step 10

Locate and repair an open to the HEATER BLOWER fuse battery feed circuit (CKT A60). Refer to Testing for Continuity in Wiring Systems.

Is the repair complete?

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Go to Step 16

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Measure the voltage at terminal 6 (motor+).

Is the voltage within the specified value?

11 - 13 V

Go to Step 11

Go to Step 12

1. Move the negative lead of the DMM to another ground location.
2. Re-measure the voltage at terminal 1.

Is the voltage within the specified value?

11 - 13 V

Go to Step 13

Go to Step 14

1. Disconnect the blower motor ground (BRN wire) from the blower control module.
2. Connect a fused jumper wire between the BRN wire and ground.
3. Turn the ignition switch to the ON position.

Does the blower motor operate?

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Go to Step 12

Go to Step 15

Replace the blower control module.

Is the replacement complete?

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Go to Step 16

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Locate and repair the open in CKT F812 (BLK).

Is the repair complete?

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Go to Step 16

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Locate and repair the open in CKT A465 (RED).

Is the repair complete?

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Go to Step 16

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Replace the blower motor.

Is the replacement complete?

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Go to Step 16

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Operate the system for which the symptom occurred.

Is the symptom still present?

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System OK