Did you perform the Defogger System Check?

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Go to Step 2

Go to Defogger System Check

1. Disconnect defogger relay in the rear compartment relay center 2.
2. Turn the ignition to RUN.
3. Connect a test light between the relay terminal  D1 and ground.

Did the test light illuminate?

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Go to Step 3

Go to Step 14

Connect a test light between the connector terminal D3 and ground.

Did the test light illuminate?

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Go to Step 4

Go to Step 15

Connect a test lamp between connector relay terminal D3 and terminal C1.

Did the test light illuminate?

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Go to Step 7

Go to Step 5

1. Connect a fused jumper between terminal D3 and terminal C1.
2. Disconnect the defogger negative feed bus connector.
3. Connect a test light between the positive feed bus of the rear defogger and ground.

Did the test light illuminate?

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Go to Step 6

Go to Step 10

1. Connect the defogger positive feed bus connector.
2. Disconnect the defogger negative feed bus connector.
3. Connect a test lamp between the negative feed bus of the rear defogger and ground.

Did the test light illuminate?

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Go to Step 11

Go to Step 13

1. Start the engine.
2. Press the defogger switch.
3. Measure the resistance from the relay harness connector terminal C3 to ground.

Does the resistance measure within the specified range?

0-5 ohms

Go to Step 12

Go to Step 8

1. Turn off the ignition.
2. Disconnect the body control module connector.
3. Connect a test lamp between relay connector terminal D1 and terminal C3.
4. Connect a fused jumper between body control module connector terminal C15 and ground.
5. Turn the ignition switch to RUN.

Did the test light illuminate?

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Go to Step 9

Go to Step 16

1. Connect the scan tool.
2. Start the engine.
3. Press the defogger switch.

Did the PZM command the defogger to turn on?

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Go to Diagnostic System Check in HVAC

Go to Step 18

1. Test CKT 270 (TAN) for an open. Refer to Wiring Repairs in Wiring Systems.
2. Inspect for poor connections/terminal tension at terminal A of the rear defogger connector. Refer to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Defogger System Check

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1. Test CKT 1250 (BLK) for an open. Refer to Wiring Repairs in Wiring Systems.
2. Inspect for poor connections/terminal tension at terminal A of the negative feed bus connector. Refer to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Defogger System Check

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Inspect for poor connections/terminal tension at the relay harness connector. Refer to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Defogger System Check

Go to Step 17

Test CKT 270 (ORN) for a short to ground. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Defogger System Check

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Test CKT 147 (LT GRN) for an open. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Defogger System Check

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Test CKT 1242 (RED) for an open. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Defogger System Check

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Test CKT 193 (WHT) for an open. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Defogger System Check

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Replace the defogger relay.

Did you complete the repair?

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Go to Defogger System Check

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Replace the body control module (PZM). Refer to Body Control Module Replacement in Body Control Systems.

Did you complete the repair?

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Go to Defogger System Check

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