How Do I Test A Rear Window Defogger Relay

If it doesnt check for a bad fuse and replace it if necessary.

How do i test a rear window defogger relay. You can test this with the defroster test lamp or an automotive circuit tester. THe relay for the rear window defogger is under the hood in the relay center here is a guide to help you test it and the location of the relay in the diagrams below. If the voltage is fine the problem is somewhere in the wiring or at the grid. 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. Button in question is pictured below. Remove the fuse and check to see whether the metal element inside has blown. Disconnect both wires from either side of the defroster grid and touch one end of your tester to each wire.

In this video 1A Auto shows you how to diagnose and repair a damaged defrost grid panel. Check the connections from the wiring harness to the grid. If the window does not clear there could be an issue with the defogger switch. I looked in the manual but it does not clearly state were the fuse is for the rear defroster.

Looked to identify a rear or mirror defrost button in a new to me 2017 GMC Sierra 1500 base with elevation edition package. This video applies to most vehicles with a defrost grid on the rear. Also known as a defogger your rear defroster has to work very differently from the one up front due largely to the absence of any hot air ducts linking it to the vehicles climate control system. Fortunately the solution to this quandary is very simple and it involves harnessing the 12-volt electrical system in an automobile to generate heat.

Car seats were optional in those days. Once you push the rear window defogger switch the defogger should turn on and the window should clear in just a few minutes. Follow the grid wire by touching the line with the test light at small intervals. Bench testing the Ford 4 or 5 pin relay is not hard to do at all and in this article Ill show you how to do it there are two articles in site about bench testing a Ford relay you can find the other here.

If you had kids you could pass a cloth to the back seat and give orders to keep the rear window clear. If the light comes on you have power. These relays like the one in the photo in the image viewer are used in the majority of Ford vehicles. Make sure the rear defroster switch and the ignition key are turned on.

The switch powers and completes the circuit of the electrical grid so if part of the grid does not work the switch will not work. Rear Window Defogger Relay. Fuserelay box under hood check fuse 11 30A and rear window defogger relay. Replace the fuse with a new one of the same rating and check whether this fixes the problem.

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. Inflatable Restraint Instrument Panel Module Disable Switch Inflatable Restraint Sensing and Diagnostic Module. Also check fuse box under the dash driver side fuse 14 10A. 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.

Thanks for any help. Bench Testing A Ford Relay A Step-by-Step Guide. The tab on the passenger side is the ground tab. Rear Window Defogger Relay.

Rear defroster not working. Check whether power is getting to your defroster grid. 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. Left Headlamp High Beam 41- -42.

My rear window does not seem to have defrost lines in it. So if your checking for voltage one probe to the tab on each side. 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. Body Control Module BCM 40.

Check your owners manual for the location of the rear defroster fuse. If your checking for continuity then disconnect the wire connector from the tab on both sides and place a probe on each tab on the window set your meter to continuity. Start at the positive connection of the grid. If not or if the fuse blows again call a mechanic.

Front Parking Lamps Front Side Marker Lamps.

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