Question about 1988 Acura Legend

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Rear window defrost not working all fuses appear to good

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Check with test light or volmeter on the defroster wire. If there is power, the defroster is bad. If no power, than switch or fuse is bad.

Posted on Nov 17, 2009

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There is a module that controls the rear window defogger grid . LGM/ EGM Liftgate or endgate module .Receive's message on class 2 serial data network from the HVAC control module to turn it on when button pressed . Fuse # 3 30 amp located in the rear fuse box . Do you know where the rear fuse box is ?
Rear Window Defogger Description and Operation
Rear Window Defogger System Components
The rear window defogger system consist of the following components:
• HVAC control module
• Liftgate module (LGM)/endgate module (EGM)
• Rear window defogger grid
Rear Window Defogger Operation (With LGM)
Battery positive voltage is supplied through the LGM 2 fuse to the LGM for the rear window defogger system. When the rear window defogger switch is depressed, the HVAC control module illuminates the rear window defogger indicator, and sends a class 2 message to the LGM to enable the rear window defogger. The LGM enables the rear window defogger by allowing battery positive voltage to the rear window defogger.
When the rear window defogger switch is pressed for the first time, the defogger cycle lasts 10 minutes. Further operation results in 10 minute defogger cycles.
Rear Window Defogger Operation (With EGM)
Battery positive voltage is supplied through the EGM 2 fuse to the EGM for the rear window defogger system. When the rear window defogger switch is depressed, the HVAC control module illuminates the rear window defogger indicator, and sends a class 2 message to the EGM to enable the rear window defogger. The EGM enables the rear window defogger by allowing battery positive voltage to the rear window defogger.
The following conditions must be met for rear window defogger to operate:
• The end gate glass position is not below the index position.
• The window express down movement is not requested.
• The window down movement is not requested.
If the end-gate glass is not fully closed, the DIC displays "Tailgate Glass Down" when the rear defogger operation is attempted.
When the rear window defogger switch is pressed for the first time, the defogger cycle lasts 10 minutes. Further operation results in 10 minute defogger cycles.

Fuse Block - Rear
Beneath the left rear seat

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Where is relay and fuse for rear window defrost


Where is relay and fuse for rear window defrost

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The rear window defroster does not defrost. The light comes on and the fuse is good. The wiring travels via the drivers side and appears intact without interruptions.


check the lines on the inside window. if theres a break in one it wont work....they make a applicator in a bottle for a quick fix if you can spot the break in it

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Rear defroster of chevy malibu not working


The only thing I can offer without more information is to check the fuse to the rear defrost. If your rear window has little wires connecting to the defrost wires on the window, make sure they are connected. I wish I could help you more. I hope this is helpful. Please leave a good rating.

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one little wire on each side of window sometimes they are loose or get unplugged check there and if not fuses if not relay in fuse box lid of that shows with and where it and they are good luck

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