Did you review the rear window defogger circuit description and perform the necessary inspections?

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Go to Step 2

Go to Symptoms

Verify that the defoggers and the heated mirrors are always on.

Do the defoggers and heated mirrors operate normally?

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Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

1. Connect the Scan Tool.
2. Turn the ignition to RUN.
3. Turn the rear defogger ON.
4. Display the outputs.

Is the rear defogger being requested on?

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Go to Step 4

Go to Symptoms

1. Disconnect the HVAC control assembly.
2. Test for voltage at th

Is battery voltage present?

B+

Go to Step 5

Go to Step 6

1. Check for proper terminal contact at the HVAC control assembly. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
2. If OK, replace the HVAC control assembly. Refer to the appropriate procedure:

•	Control Assembly Replacement in HVAC Systems - Manual

•	Control Assembly Replacement in HVAC Systems - Automatic

Was the control assembly replaced?

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Go to Step 7

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1. Check for proper terminal contact at the electronic climate control (ECC) module. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
2. If OK, replace the ECC module.

Was the module replaced?

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Go to Step 7

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Operate the system in order to verify the repair.

Did you find and correct the condition?

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System OK

Go to Step 3