DEFINITION: This test should be performed when the Defogger does not operate properly.

Has the Defogger System Check been performed?

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Go to Step 2

Go to Defogger System Check

1. Disconnect the Rear Window Defogger Connector.
2. Connect a test light from Cavity A to Ground.
3. Place the Ignition in the RUN position.
4. Depress the Defogger button.

Does the test lamp light?

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Go to Step 3

Go to Step 4

Repeat Step 2.

Does the test lamp remain lit?

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Go to Step 5

Go to Step 10

1. Disconnect the connector C222 at the Convenience Center.
2. Connect a test light from Cavity A of the Convenience Center to Ground.
3. Depress the Defogger button.

Does the test lamp light?

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Go to Step 6

Go to Step 7

Refer to Defogger Grid Lines Diagnosis .

Is the Repair Complete?

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Go to Defogger System Check

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Repair the open in CKT 293 (PPL) between the Rear Window Defogger Grid and connector C222 at the Convenience Center.

Is the repair complete?

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Go to Defogger System Check

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1. Disconnect the connector C1 at the HVAC Control Module.
2. Connect a test light from terminal A to ground.

Does the test lamp light?

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Go to Step 8

Go to Step 9

Connect a tst light between terminal A and D of Connector C1.

Does the test lamp light?

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Go to Step 10

Go to Step 11

Repair the open in CKT 1440 (ORN) between the HVAC Control Module and the Underhood Fuse Block.

Is the repair complete?

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Go to Defogger System Check

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Replace the HVAC Control Module.

Is the repair complete?

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Go to Defogger System Check

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Repair the open in CKT 293 (PPL) between the HVAC Control Module and the Convvenience Center.

Is the repair complete?

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Go to Defogger System Check

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