How To Test Rear Window Defroster

Check your owners manual for the location of the rear defroster fuse.

How to test rear window defroster. If youve tested your rear defroster using the best testing methods and have located a break in your defroster lines proceed with your repair. This video applies to most vehicles with a defrost grid on the rear. The average car owner can attempt to repair this. This repair applies to most vehicles with a defrost grid panel.

As you might imagine the defrost lines that make up this grid are fairly sensitive to physical damage. You can test this with the defroster test lamp or an automotive circuit tester. If the test light comes on you have found the positive side. As always please refer to the shop manual for the proper.

Turn the vehicle on and connect the ground lead of the ohmmeter to the defrosters ground connector this is usually on the passenger side of the back glass. Rear windows has 12 heating wires painted to the glass and cca. Make sure the rear defroster switch and the ignition key are turned on. Old wiring or a blown fuse can cause a disconnect.

Hello I would like to develop a testing method to detect window defroster grid failures. If the fuse doesnt look blown check with your voltmeterwith the key on and the defroster on you should see 12 volts at both fuse terminals. Check the connections from the wiring harness to the grid. If the voltage is fine the problem is somewhere in the wiring or at the grid.

The act of scraping or cleaning a rear window can sometimes sweep away enough of the metal to interrupt the circuit which in turn prevents electricity from being transmitted to that segment of the car defroster. Disconnect both wires from either side of the defroster grid and touch one end of your tester to each wire. If you see 12-14 volts or the test light is on then you have a good circuit and the problem is likely with the grid itself. The two most popular are the Permatex Complete Rear Window Defogger Repair Kit No.

In this video I show you the method I use to repair a rear window defogger tab that was snapped off. Turn the defroster on and place a volt meter probe on each wire on each side of the glass inside body ground the - probe you should detect voltage move to each line of the grid. Most auto parts stores stock rear window defogger repair kits. There are a few ways to check proper operation the first is a volt ohm test.

Make sure the rear defroster switch and the ignition key are turned on. Now take the power lead and gently drag the lead along the suspected grid line. In this video Kalash garage shows you how to check and repair a damaged defrost grid panel. Checking Rear Window DefoggerDisclaimerThis video is not meant to be a definitive how toAlways consult a professional repair manual before starting your re.

Wait a minute and add a second coat. In this video 1A Auto shows you how to diagnose and repair a damaged defrost grid panel. If the light comes on you have power. There is blue painters type tape supplied with your kit but if you need extra you can use the standard hardware store blue tape.

If it doesnt check for a bad fuse and replace it if necessary. Clip the test light to a good ground on your vehicle and touch the connections of the grid with the pick of the test light. Disconnect both wires from either side of the defroster grid and touch one end of your tester to each wire. You can test this with the defroster test lamp or an automotive circuit tester.

The rear defroster system draws a lot of current so this is fairly common. The other is to simply feel the glass for heat change. 09117 and the Syon Rear Defogger Repair Kit No. Check whether power is getting to your defroster grid.

If the light comes on you have power. Shake the small vial of conductive paint thoroughly and simply brush the paint over the scratch. Follow the grid wire by touching the line with the test light at small intervals. The first step is to tape off the repair area.

Now test the voltage at the defroster power clipstabs on the defroster using a volt meter or test lamp with one lead to each of the tabs. Its easy for the terminals at the grid to become damaged. Wait a minute longer and remove the masking.

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