Circuit/System Description
For an overview of the component/system, refer to: Rear Window Defogger Description and Operation
| Circuit | Description |
|---|---|
| B+ - Relay Switch | Supplied from a fuse. |
| E18 Rear Defogger GridControl - Component | The output circuit is switched to 12 V to activate the component. |
| Control - Relay Coil | The output circuit is switched to 12 V to activate the component. |
| E18 Rear Defogger GridGround - Component | Chassis Ground |
| Ground - Relay Coil | Chassis Ground |
| Component | Description |
|---|---|
| KR5 Rear Defogger Relay | A relay is a switch that is actuated by a solenoid. |
| E18 Rear Defogger Grid | Window defoggers are parallel resistive conductors in or on the glass that heat up when electric power is applied. |
| A26 HVAC Controls | The position of the defogger switch is read by the control module A26 and, via CAN bus, forwarded to the control module K33, which translates the bus message into a control signal for E18. |
| K33 HVAC Control Module | The control module controls a series of actuators to ensure optimal heating, ventilation and air conditioning of the passenger compartment. The control module does this by reading values from a variety of sensors and interprets the data and adjusts the actuators accordingly. |