Heated Glass Element: Description and Operation

OPERATION
- If the defogger switch is turned to "ON" when the generator is generating electricity (L terminal exceeds 10 V) with the ignition switch at the "ON" position, the timer circuit in the A/C-ECU unit will be operated keep the transistor "on" for 20 minutes to close the contact point of the defogger relay. When the defogger relay is "on", the defogger will be activated. Moreover, the indicator light of the defogger switch is lit to inform that the defogger is activated.
- When 20 minutes have passed, the defogger will stop activating even if the defogger switch is at "ON".

When the defogger is activated (the timer is activated), they will also stop activating even if the defogger switch is set at "ON" again or if the generator stops generating electricity (the terminal is 3.5 V or less).