Question about 1997 Chevrolet Cavalier

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Inop rear defogger

Is there a relay in that circuit? If so where is its location. Fuse is good, light comes on, clicking noise when switch is depressed. Connections at glass good. Just quit. Tried to gain access to HVAC control panel but could not get to screw on right side trim panel.

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  • Chevrolet Master
  • 443 Answers

If anyone has cut or rubbed one of the lines off of the glass it will not work any longer .. look over the windown good on the inside and see if it has been rubbed in to somewhere ..

Posted on Jan 28, 2009

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My heater only works some of the time and my rear defrost dont work what could be the problem


As by heat only works some of the time , you mean it doesn't blow air out of the vent's . This means you probably have a problem with the blower motor or blower motor resistor or blower motor relay .
Rear Window Defogger Inoperative

    Exchange the rear defogger relay with a known good relay from the under hood junction block.
  1. Turn the ignition switch to the ON position.
  2. Press the rear defogger switch to the ON position.
Does the rear defogger grid warm?
--
Yes Go to Step 2
NO Go to Step 3

2

Replace the faulty relay.
Is the repair complete?
Go to Defogger System Check --

3

  1. Use a fused jumper wire in order to backprobe between terminal A4 of underhood junction block connector C3 and ground.
  2. Use a test lamp in order to backprobe between terminal C5 of underhood junction block connector C3 and ground.
Does the test lamp light?
--
Go to Step 4
Go to Step 23

4

  1. Use a test lamp in order to backprobe between terminal C5 of underhood junction block connector C3 and ground.
  2. Press the rear defogger switch to the ON position.
Does the test lamp light?
--
Go to Step 5
Go to Step 14



Mar 23, 2016 | 1999 Oldsmobile Alero

1 Answer

My rear wiper, defroster and licence plate lights stopped working on my 2007 suzuki swift but when I open the rear hatch the licence plate lights come on . Any ideas what's wrong?bad ground?


[PDF]Wiring Diagram.pdf - Ken Gilbert

ken-gilbert.com/wrx/mans/99.../Wiring%20Diagram.pdf
Each connector number shown in the wiring dia- ... Rear defogger cord (Ground). Fuel tank cord,. Roof cord, ... circuit. Then check the switch, relay, fuse, ground, etc. 4. .....Rear wiper motor. Rear wiper ... License plate light RH. Tail light LH.

#? license plate light - Circuit Wiring Diagrams

circuitswiring.com/tag/license-plate-light/
2008 Volkswagen Newbeetle Main Fuse Box Diagram 2008 Volkswagen Newbeetle ...Parts: rear window defogger, shift lock, battery positive voltage, interior light, A/C clutch, ... brake light, daytime driving light, wiper and washer system, vacan, fuel pump, central ... 1997 Suzuki Geo Tracker Left Dash Fuse Box Diagram.

#? license plate light - Circuit Wiring Diagrams - Page 3

circuitswiring.com/tag/license-plate-light/page/3/
Audi A4 Engine Fuse Box Diagram Audi A4 Engine Fuse Box Map Fuse Panel ... mirror control, wiper, washer, horn, brake light, cruise control, heated rear window, ... 2003Suzuki Aerio Dash Fuse Box Diagram 2003 Suzuki Aerio Dash Fuse Box ... rear defroster, fuel injection controller, radio, A/T controller, hazard light, ...

Jan 05, 2016 | Suzuki Cars & Trucks

2 Answers

Why is my rear defrost not working


Switch, fuse or maybe the wiring to the window has come loose or off, happens alot, kits are available at local auto parts stores...
I hope that helps...

Mar 02, 2015 | 2008 Chevrolet Malibu

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FORD 2001 CV - Headlights and running lights off, instrument cluster lights off, dome light off, rear window defogger off, turn signals not working. Check all mini fuses under dash OK, maxi and mini fuses...


Your owners manual will show you the location of the relay, for the lights, swap the lights relay with another on. Also, if the light switch is working, and the fuse is good, you will be able to hear the relay click. Have a helper run the light switch while you listen for it to click.

Dec 23, 2014 | Cars & Trucks

1 Answer

Rear window defogger stopped working


In the fuse block, you will find 25A FUSE 17 which feeds the rear window defogger relay coil and 30A circuit breaker 4 which feeds the contacts.

Dec 26, 2013 | 1993 Buick LeSabre

1 Answer

Can't find fuse for heated rear window, or relay for same. Also want to know where to find fuse for interior lights


The window defogger is often powered through a circuit breaker, which should be located at the driver's side fuse panel. If you have power at the window connector, likely the window grid may need repair. Toyotas have relays everywhere, but fuses are usually only under the hood in the Power Distribution Box, and at the driver's side fuse panel.

Feb 20, 2013 | Toyota Avensis Cars & Trucks

1 Answer

Rear defroster inop


easy fix is sometimes the "circuit breaker" in the inside fuse panel, on GM products they are likely silver colored and pull out and plug in just like a fuse. Some car makers have the diagram inside the fuse cover which makes it convenient to see which fuse or breaker applies to the defogger. you can switch identical cir.brkr.s with each other to see if then it operates. then get a new one from your parts store. I switch the power seat relay with the rear defrogger relay and this confirms my check before spending any money. good luck keith

Dec 30, 2011 | Cars & Trucks

1 Answer

I have an '03 Olds Alero and the rear defrost is not working...replaced the relay....switch lights up and continuity is good across the grid. I put the relay in both ways..not knowing if it makes a...


The relay can go in either way--no problem. The relay runs off 2 different fuses--one to power the relay itself and one to power the defogger. Make sure both fuses 33 and 46 in the engine compartmet fuse box are good.
Next, have someone listen to the relay while you turn on the defogger to see if it's clicking. If it isn't clicking, the problem is before the relay--probably in the control panel.
If the relay is clicking, the problem may be with the antenna amplifier (radio borrows the defogger grid to improve reception). Not sure where that module is but would guess it's in the right pillar by the passenger's fuse box. If you can find it, check continuity across the 2 black leads. Also verify the back side of the defogger is getting it's ground.
Please let me know if you have more questions.

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Nov 02, 2010 | 2003 Oldsmobile Alero

1 Answer

1998 buick park ave. rear window defroster not working. fuse is good, has anyone replaced the black box located next to rear window where element plugs into along with the antenna. element on window is not...


Rear Defogger Inoperative, But Heated Mirrors Operate Correctly
1. Connect scan tool. Turn ignition switch to RUN position. Turn rear defogger on. Using scan tool, display BCM
outputs. If rear defogger is being requested on, go to next step. If rear defogger is not being requested on, go to
step 10).
2. Ensure ignition switch is in RUN position. Remove rear defogger relay from rear junction block, located on center
right rear of passenger compartment, under rear seat. Connect test light between ground and defogger relay
harness connector terminal F3 (Brown wire). If test light illuminates, go to next step. If test light does not
illuminate, go to step 11).
3. Connect test light between ground and defogger relay harness connector terminal A2 (Red wire). If test light
illuminates, go to next step. If test light does not illuminate, go to step 12).
4. Connect test light between defogger relay harness connector terminals A2 (Red wire) and B3 (Purple wire). If test
light illuminates, go to step 13). If light does not illuminate, go to next step.
5. Disconnect rear defogger positive and negative feed bus connectors. Connect a jumper wire between defogger
relay harness connector terminals F3 (Brown wire) and A4 (White wire). Connect test light between ground and
positive feed bus connector terminal "A" (Black wire). If test light illuminates, go to next step. If test light does not
illuminate, go to step 8).
6. Connect test light between positive feed bus connector terminal "A" (Black wire) and negative feed bus connector
terminal "B" (Black wire). If test light illuminates, go to next step. If test light does not illuminate, go to step 9).
7. Repair open in Black wire between rear defogger and ground. Recheck system operation.
8. Repair open in Purple wire between rear junction block and heated backlight antenna module. Recheck system
operation.
9. Check for proper terminal contact at rear defogger connectors. Repair as necessary. Recheck system operation.
10. Check for proper terminal contact at BCM. If terminal contact is okay, replace BCM. Recheck system operation.
11. Repair open in Brown wire between rear junction block and instrument panel junction block. Recheck system
operation.
12. Repair open in Red wire between rear junction block and underhood junction block (located in right front corner of
engine compartment, between battery and strut tower). Recheck system operation.
13. Connect test light between defogger relay harness connector terminals F3 (Brown wire) and A4 (White wire). If
test light illuminates, go to next step. If test light does not illuminate, go to step 16).
14. Reinstall defogger relay. Disconnect BCM 32-pin Pink connector C2. BCM is located behind right side of instrument
panel, near rear of glove box. Using DVOM, check voltage between ground and BCM harness connector C2
terminal A3 (White wire). If any voltage is present, go to next step. If no voltage is present, go to step 17).
15. Repair open or short to ground in White wire between rear junction block and BCM. Recheck system operation.
16. Check for poor connection at defogger relay terminals. If connections are okay, replace defogger relay. Recheck
system operation.
17. Check for proper terminal contact at BCM. If terminal contact is okay, replace BCM. Recheck system operation.

Feb 25, 2010 | 1998 Buick Park Avenue

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