Did you perform the Defogger System Check?

--

Go to Step 2

Go to Defogger System Check

1. Disconnect the 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.

Does the test light illuminate?

--

Go to Step 3

Go to Step 14

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

Does the test light illuminate?

--

Go to Step 4

Go to Step 15

Connect a test light between the connector relay terminal D3 and terminal C1.

Does the test light illuminate?

--

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.

Does the test light illuminate?

--

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.

Does the test light illuminate?

--

Go to Step 11

Go to Step 13

1. Start the engine.
2. Press the defogger switch.
3. Use a J 39200 digital multimeter (DMM) in order to measure the resistance between the relay harness connector terminal C3 and ground.

Is the resistance 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 light between relay connector terminal D1 and terminal C3.
4. Connect a fused jumper between the body control module connector terminal D9 and ground.
5. Turn the ignition switch to RUN.

Did the IGNO-BODY fuse blow?

--

Go to Step 9

Go to Step 16

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

Did the body control module (PZM) command the defogger to turn on?

--

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 faulty connections and/or improper terminal tension at terminal A of the rear defogger connector. Refer to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Defogger System Check

--

1. Test CKT 1250 (BLK) for an open. Refer to Wiring Repairs in Wiring Systems.
2. Inspect for faulty connections and/or improper 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?

--

Go to Defogger System Check

--

Inspect for faulty connections and/or improper terminal tension at the relay harness connector. Refer to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

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?

--

Go to Defogger System Check

--

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

Did you find and correct the condition?

--

Go to Defogger System Check

--

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

Did you find and correct the condition?

--

Go to Defogger System Check

--

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

Did you find and correct the condition?

--

Go to Defogger System Check

--

Replace the defogger relay.

Did you complete the repair?

--

Go to Defogger System Check

--

Replace the PZM. Refer to Body Control Module Replacement in Body Control System.

Did you complete the repair?

--

Go to Defogger System Check

--