The energized relay closes its internal switch, allowing high-current power to flow from Fuse Ef7 (30A) directly to the rear window grid.
The system uses a applied to the inner surface of the rear glass. When current passes through these lines, they generate heat to clear fog or frost. Operating Voltage: 12V DC. shema obogreva zadnego stekla lanos
When you press the defogger button, a signal is sent to the relay coil. In most Lanos models, this is managed by a timer (often integrated into the relay or ETACS module) that keeps the system on for ~10–15 minutes. The energized relay closes its internal switch, allowing
Momentary switch (button) activating a relay. 🛠️ Key Components & Locations Fuse Ef7 (30A) Engine Room Fuse Box Main power supply for the heating grid. Fuse F11/F12 (10A) Cabin Fuse Box Power for the control circuit and switch indicator. Defroster Relay Engine Room Fuse Box Typically labeled as "Rear Window Defroster Relay". Control Switch Center Console Momentary push-button with a built-in LED indicator. Heating Grid Rear Glass Parallel rows of conductive lines. 🔌 Wiring Logic The circuit operates in two stages: Control and Load . Operating Voltage: 12V DC
The grid is grounded on the opposite side of the window (usually the left or right pillar). 🔍 Troubleshooting & Common Issues If your defogger is not working, check these in order:
Parallel (each horizontal line acts as a separate branch).
Heated Glass (Defrost, Defogger) Circuits: Overview & Testing