Rear Window Defogger Circuit Description for Chevrolet Camaro 1998
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.
