Defogger Does Not Turn Off Automatically

WARNING: This page is about a different car, the 2002 Ford Focus. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect defogger relay. Perform DEFOGGER RELAY TEST under COMPONENT TESTS. If defogger relay tests okay, go to next step. If defogger relay does not test okay, replace defogger relay.
Turn ignition on. Ensure rear defogger switch is in OFF position. Using a voltmeter, measure voltage between Central Junction Box (CJB) defogger relay connector terminal No. 1 (Green/Yellow wire) and CJB defogger relay connector terminal No. 2 (Black/Orange wire). See Figure. If voltage is battery voltage is present, repair short in Black/Orange wire and retest system operation. If battery voltage is not present, verify customer concern.