For 1990-2009 cars

When the rear defogger switch is pressed, voltage is applied to the following components:

• | The solid state timing circuit

• | The ON indicator

CKT 193 energizes the rear defogger relay in order to close the relay switch contacts. This action applies voltage to CKT 293 and the rear defogger grid. The rear window warms in order to remove the condensation from the surface of the window.

The contacts in the timing circuit remain closed until one of the following actions occurs:

• | The rear defogger switch is pressed again.

• | The timer cycle completes.

• | The ignition switch is turned to the OFF position.

When the rear defogger switch is pressed once, the timing circuit allows the rear defogger to operate for approximately 10 minutes. Each time the rear defogger switch is pressed after the initial actuation, the timing circuit operates for approximately 5 minutes. The timing circuit resets to 10 minutes when the ignition switch is turned to the OFF position.