There may be a fuse in the fuse panel under dash, but defoggers are often found with a circuit breaker rather than a fuse. There may also be a relay in the circuit to the rear window. You could pull off the connector at the window, and with key on and defogger switch on, check for power at the connector. If you have power, one of the grid wires on the window may be broken. Kits are available to fix that.
If no power at the window, IDK, may have to find a wiring diagram, or have an electrician or mechanic start looking into it. Good luck.
SOURCE: Radio cuts out when rear window defogger is turned on(05' Altima)
I have the same problem in my 2003 Altima. I had a friend who works on cars check it out. I watched him and when he removed the panel under the steering wheel next to the driver's door you could hear a clicking noise. He said is sounds like my defogger relay/switch is bad. I located the part and it is not that expensive. I am going to purchase the part and have it put on. I will keep you posted to let you know if it solves my problem. If it does I will give you the name of the part so you can hopefully solve your issue.
SOURCE: Where is the fuse for the rear window defogger?
The rear defogger is fuse #14 (40 Amp fuse) in the underhood fuse box,no other fuses, I have the owners manual. If the fuse checks good test the heater grid of the rear defogger, it is most likely is an open circuit, it can be repaired by the dealer or u..
SOURCE: 2003 olds alero rear windoe defogger
the rear passager panel the one that cover the side rear window there a relay connector in there that were the power to window go that defectif that gonna FIXYA our post thank you pierre
SOURCE: 2001 Sienna rear window defogger doesn't work
There are 3 fuses that control the rear defogger, and 1 relay
The fuses are: 10 amp HEATER, 10 amp MIRROR-HEATER; under the dash
The 30 amp DEF fuse is in the fuse box under the hood
The relay is the DEFOGGER relay, which is on the back side of the fuse panel under the dash
Also, check for a loose wire on the defroster grid (on the back glass), this is the most common problem.
SOURCE: upgrading nissan almera dipped headlights?
I would have the complete headlight circuit checked out by a competent tech before buying more bulbs.
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Liftgate module (LGM)/endgate module (EGM)
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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.
DTC B0283 Electric Rear Defrost Circuit - do you know what DTC'S - diagnostic trouble code's are ?
Circuit Description
The liftgate module (LGM)/endgate module (EGM) monitors the voltage level on the supply voltage circuit of the rear window defogger. The LGM/EGM test the supply voltage circuit of the rear window defogger every 160 milliseconds. With the rear window defogger inactive, the supply voltage circuit of the rear window defogger will have no voltage present. With the rear window defogger active, the supply voltage circuit of the rear window defogger will be near system voltage.
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