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rear defrost comes on by itself and wont shut off sometimes

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Old Apr 18, 2006 | 04:30 PM
  #1  
subroc's Avatar
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From: Guilford, Connecticut
Car: 1988 IROC-Z camaro
Engine: 355 TPI
Transmission: tko 500
Axle/Gears: Dana 44 3.31 posi pbr brakes
rear defrost comes on by itself and wont shut off sometimes

Ok this is a weird one that started right after i brought the car up to a car show. On the way up i noticed that the rear defrost was on and i thought that was weird cause i hadnt turned it on so i turned it off not thinking much of it. 2 minutes later it was on again! This time however it would not let me turn it off. I waited a few more minutes and then i shut it off. Then it turned itself on again!! I just gave up and let it stay on. Anyone got any ideas on this one? Its not really a big issue just annoying.
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Old Apr 18, 2006 | 11:24 PM
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From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Let me guess, it turns itself on when you hit the brake?
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Old Apr 19, 2006 | 01:36 PM
  #3  
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From: Guilford, Connecticut
Car: 1988 IROC-Z camaro
Engine: 355 TPI
Transmission: tko 500
Axle/Gears: Dana 44 3.31 posi pbr brakes
Nope wont shut off when i hit the brakes. It will only shut off if i turn it off but sometimes it wont let me turn it off and if it does let me then it will just turn itself on again in a mile or two.
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Old Apr 19, 2006 | 07:03 PM
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From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
I said turns itself on when you hit the brakes.
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Old Apr 19, 2006 | 08:21 PM
  #5  
subroc's Avatar
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From: Guilford, Connecticut
Car: 1988 IROC-Z camaro
Engine: 355 TPI
Transmission: tko 500
Axle/Gears: Dana 44 3.31 posi pbr brakes
Oh sorry didnt read carefully enough. I didnt make the connection bettween hitting the brakes and it coming on. I would have to go out and see. It will just turn itself on when i start the car though so i dont think thats part of it.
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Old Apr 25, 2006 | 09:25 PM
  #6  
subroc's Avatar
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From: Guilford, Connecticut
Car: 1988 IROC-Z camaro
Engine: 355 TPI
Transmission: tko 500
Axle/Gears: Dana 44 3.31 posi pbr brakes
anyone..anyone.. i still have this problem
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Old Apr 25, 2006 | 09:32 PM
  #7  
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From: Pahrump, Nv
Car: 1991 z28
Engine: l98
Transmission: 700r4
I think what Apeiron was trying to ask was, when you hit the brakes, does the light come on, forcing you to turn it off manually. If this is the case, then one of the plugs on the end of the hstch suppor fell off. The rear defrost is grounded on the hatch stut via a little stake-on at the end. If you loose the ground, then this is what happens. Chect the ground connections I mentioned. It is possible one came loose as it happened all the time on my old 86 camaro.
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Old May 6, 2006 | 10:41 PM
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subroc's Avatar
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From: Guilford, Connecticut
Car: 1988 IROC-Z camaro
Engine: 355 TPI
Transmission: tko 500
Axle/Gears: Dana 44 3.31 posi pbr brakes
Thanks 91TPI5.7 thats exactly what was going on. The passenger side one fell off so i snaped it back on and all is well now. Thanks again.
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