How To Test Rear Window Defogger

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

How to test rear window defogger. Rear windows has 12 heating wires painted to the glass and cca. 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. Follow the grid wire by touching the line with the test light at small intervals. Check the connections from the wiring harness to the grid.

First determine whether your defroster is getting any power. Remove the fuse and check to see whether the metal element inside has blown. 09117 and the Syon Rear Defogger Repair Kit No. Sure there was the warm air blowing from the defrost vents at the base of the windshield but this had little if any effect on the back window at the far end of the cabin.

Old wiring or a blown fuse can cause a disconnect. The grid pattern of thin brown horizontal lines are made from a silver ceramic conductor which is silk screened essentially painted onto the inside of the rear window and then baked at high temperatures. You can test this with the defroster test lamp or an automotive circuit tester. Automotive rear window defroster are sophisticated surface heaters.

Rear Window Defogger First things first check to see if power is going to the elements. Disconnect both wires from either side of the defroster grid and touch one end of your tester to each wire. The window will not clear. The two most popular are the Permatex Complete Rear Window Defogger Repair Kit No.

Its easy for the terminals at the grid to become damaged. If you had kids you could pass a cloth to the back seat and give orders to keep the rear window clear. There are a few ways to check proper operation the first is a volt ohm test. If the light comes on you have power.

If the window does not clear there could be an issue with the defogger switch. The ignition switch and defogger switch need to be on for these step Find a good ground in the rear placing the black lead of the multi-meter on it and place the red lead on the drivers side positive side connector. Those metal tabs located along the edges of the back window can separate from the defroster and are a common reason for defroster failure. Turn the defroster on and place a volt meter probe on each.

Now take the power lead and gently drag the lead along the suspected grid line. If the test light comes on you have found the positive side. In this video 1A Auto shows you how to diagnose and repair a damaged defrost grid panel. This video show ho.

Repair broken electrical contacts on your defogger or car window defroster. In this video series I go through the process of diagnosing and repairing a rear window defroster that will not work. The other is to simply feel the glass for heat change. Fortunately the solution to this quandary is very simple and it involves harnessing the 12-volt electrical system in an automobile to generate heat.

Most auto parts stores stock rear window defogger repair kits. 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. If it doesnt check for a bad fuse and replace it if necessary. Replace the fuse with a new one of the same rating and check whether this fixes the problem.

If not or if the fuse blows again call a mechanic. Once you push the rear window defogger switch the defogger should turn on and the window should clear in just a few minutes. 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. Hello I would like to develop a testing method to detect window defroster grid failures.

If you believe your rear window defogger switch is going bad check for the following symptoms. Make sure the rear defroster switch and the ignition key are turned on. Start at the positive connection of the grid. Car seats were optional in those days.

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