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Old March 12th, 2018, 05:45
gba88 gba88 is offline
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99 Rear defroster (not a grid issue)

Hi Guys,
I've been trying to figure out why my rear defroster quit working. I get power on one terminal of the grid, but not the other -not even sure if that's normal. I cannot see any breaks or continuity issues with the grid itself. I know there are 2 bundles of wires that come out of the top and into the tailgate. I'm thinking a wire in one of those bundles might be broken. Would it be the left or right (or both) that contain the wires that connect to the grid? Any help appreciated.
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Old March 12th, 2018, 10:09
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Tim_MN Tim_MN is offline
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Re: 99 Rear defroster (not a grid issue)

Failure of wires in the tailgate and the drivers door wire harness are common, usually at or near the rubber boot/hinge area. A visual inspection for damaged wires, failed wire splices, and chafed/cracked wire insulation should be your first troubleshooting step.
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Last edited by Tim_MN; March 12th, 2018 at 10:21.
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Old March 12th, 2018, 11:00
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sinat01 sinat01 is offline
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Re: 99 Rear defroster (not a grid issue)

if the wires arnt broken at the hatch, check inside the drivers side quarter panel, behind the spare
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Old March 12th, 2018, 13:24
smccollamjr smccollamjr is offline
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99 Rear defroster (not a grid issue)

One connector is 12v the other is ground. When the defroster is on you you should read 12vDC between the two. If you donít, try checking each one against ground. If you get 12v that way, you know it has a bad ground. If you donít get 12v, switch your meter to ohms and check against a good ground. If you get 0 ohms on one of the connections, you have a power problem. Either could be a broken wire.


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Old March 13th, 2018, 07:19
gba88 gba88 is offline
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Re: 99 Rear defroster (not a grid issue)

Thanks for the replies! I found that the boot/rubber thing on the right is for the windshield washer tube and the one on the driver/left side is for the wires. I took the trim off and the hatch cover off yesterday. Holy sh!t there must be about 4 or 5 wires at least that I saw in the bundle where the insulation was cracked and coming off! No idea which was which, but what a mess. I'm going to have to wait until it gets warmer and try to repair all that I can. Thanks for the info about the wires behind the spare...if fixing what I found doesn't work that will be my next place to look.
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Old March 13th, 2018, 07:22
gba88 gba88 is offline
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Re: 99 Rear defroster (not a grid issue)

Quote:
Originally Posted by smccollamjr View Post
One connector is 12v the other is ground. When the defroster is on you you should read 12vDC between the two. If you donít, try checking each one against ground. If you get 12v that way, you know it has a bad ground. If you donít get 12v, switch your meter to ohms and check against a good ground. If you get 0 ohms on one of the connections, you have a power problem. Either could be a broken wire.


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sounds like a quick fix may be just grounding the passenger side to the vehicle. I have 12v on the driver side terminal. I'll have to test again after work one day.
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