Why is my rear defogger not working?

Make sure the rear defroster switch and the ignition key are turned on. Disconnect both wires from either side of the defroster grid and touch one end of your tester to each wire. If the light comes on, you have power. If it doesn’t, check for a bad fuse and replace it if necessary.

Is there a fuse for rear defroster?

Rear defroster fuse: If the fuse for the rear defroster is blown, the defroster won’t get power. The rear defroster system draws a lot of current, so this is fairly common. Check your owner’s manual for the location of the rear defroster fuse.

How do you diagnose a rear defogger?

How to Troubleshoot a Rear Window Defogger

1. Check the defogger circuit fuse and make sure it is in good condition.
2. Turn the ignition switch on but do not start the engine.
3. Turn the defogger switch on.
4. Open the driver’s door and look at the dome light inside your car.
5. Inspect the defogger grid on the back of the window.

Can a heated rear window be repaired?

Rear window heaters fitted by manufacturers are printed on to the surface of the glass or stuck on with special adhesive. Small breaks in an element can be repaired with special conducting paint. One of the most common and simple problems is a blown fuse. Find the fuse protecting the heated rear window circuit .

How does a heated rear screen work?

The grid on the rear window is known as a rear window defogger. It is a thin electrical element that power runs through. The resistance in the element causes it to heat up, which warms the glass. The heat melts a small amount of ice and snow, and clears the fogginess from the rear window.

How much does it cost to fix back window?

On average, it will cost anywhere from $100 to $200 to repair a crack in the back or rear window; the price might go up depending on the make or model of your car. This price can also vary depending on the manufacturer you use. If you have to replace the back window or rear window, that’s going to cost you a lot more.

Why does my defroster not work?

A bad heater core will result in no heat, which means a non-functioning defroster. If the blower motor is malfunctioning, the defroster will not work. Issues can range from a blown fuse to a bad blower speed controller. The blower motor itself can also go bad and need replacement.

How to troubleshoot a rear window defogger that still runs?

Repair the broken grid segments. Check the connection at the grid and make sure there is continuity between both sides of the connection with a multimeter. Turn on the ignition switch but do not start the engine. Use a test light to check for voltage at the grid connection.

Why does my defroster on my rear window not work?

If it lights up, the grid is getting power. Grid Breakage Test: If power is getting to the grid, your defroster problem probably is due to a break in the painted grid. This is especially likely if your defroster works on part of your rear window.

What should I use to clean rear window defroster?

If your window has a defroster grid, the only thing that should ever touch the glass is a soft cloth dampened with window cleaner. If you must clean the rear glass, scrub gently, and in the direction of the grid, not across it. You don’t want to have to replace the glass to effect this repair.

Where can I buy a defogger repair kit?

You can buy a defogger repair kit to fix a broken rear window grid at most auto parts stores. Some old vehicle models use a defogger grid installed inside the glass of the rear window. On these models the window itself needs to be replaced in order to fix a bad grid.

When to repair a broken rear window defogger?

However, the instructions warned us to wait 24 hours to test the defogger. One last note: You can only do this repair when the temperature is above 50 degrees F. The Permatex No. 09117 Complete Rear Window Defogger Repair Kit includes everything you need to repair broken tabs and grid lines for your car window defroster.

What should I do if my rear defroster is not working?

Unless you have experience working on automotive electrical systems, all but the simplest diagnostic and repair procedures below should be left to a professional mechanic. Rear defroster fuse: If the fuse for the rear defroster is blown, the defroster won’t get power. The rear defroster system draws a lot of current, so this is fairly common.

How do you repair a grid on a defogger?

To repair the grid line on your defogger, simply attach the supplied stencil to the broken grid section and paint on the electrically conductive paint. Allow it to dry, then remove the stencil. You may want to touch up your work with a single-edge razor blade. But be careful. You don’t want to damage any other grid lines.