When the ignition switch is turned to the RUN position voltage is applied through the HVAC Fuse 6. The voltage travels to the following components:
| • | The rear defogger switch |
| • | The rear defogger timer/relay |
When the rear defogger switch is pressed, voltage is momentarily applied to the rear defogger timer/relay through CKT 292. When voltage is applied to the rear defogger timer/relay, the rear defogger timer/relay will close the internal contacts.
The internal contacts remain closed until one of the following actions occur:
| • | The defog cycle is complete. |
| • | The rear defogger switch is pressed a second time. |
When the internal contacts of the rear defogger timer/relay are closed, voltage is applied to the rear defogger grid and indicator.
The rear defogger timer/relay contains an internal timer in order to control the time the internal contacts are closed. The defog cycle lasts 10 minutes when the following actions occur:
| • | The ignition switch is turned to RUN. |
| • | The rear defogger switch pressed for the first time. |
Further operation will result in 5 minute defog cycles. The defog cycle is reset to 10 minutes when the ignition switch is turned to the OFF position and back to the RUN position.
