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
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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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1 Answer

Which fuse box on the 2011 Chevy Malibu is the fuse for the rear defrost


Fuse box rear , fuse #23 30 amp ! Do you know where this is located ? There is also a relay for the Rear window defogger , located in the same rear fuse box .
Fuse Block - Rear
Left side of the luggage compartment, behind the left rear wheel well . But you really need to know how it works , you can check fuse an relay .
Rear Window Defogger Operation
Battery positive voltage is supplied through the BATT 1 fuse in the underhood fuse block to the rear defog relay switched input. When the rear defog switch button is pressed, the body control module (BCM) energizes the rear defog relay by providing a B+ to the control circuit of the rear defog relay. This allows battery positive voltage from the relay switched input through the switch contacts and out the relay switched output to the rear window defogger grid. The HVAC control module houses the rear defog switch and also illuminates the rear defog indicator on the switch button, upon this request. Ground for the rear window defogger grid is provided by G301 for the Sedan or G302 For the Extended Sedan.

Nov 23, 2016 | 2011 Chevrolet Malibu

1 Answer

My rear defroster won't work I have a 2000 Buick Park Avenue


Could be a bad relay !
The rear defogger circuit is protected by a 40A fuse. Voltage is supplied through the fuse to the rear defogger relay. When you press the rear defogger switch, the heater and A/C programmer sends a class 2 message to the body control module (BCM), to ground the rear defogger relay coil output circuit. This in turn closes the relay contacts allowing current to the rear window grid.
Do you know what a class 2 message is ? What a BCM is ?
HTD BK relay in rear fuse box ,location In the center right rear of the passenger compartment, under the rear seat cushion
Watch this video on testing from relay base ( where it plug's into )
Do
VEHICLE RELAYS Testing from the relay base

Oct 05, 2016 | 2000 Buick Park Avenue

1 Answer

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

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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.

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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

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

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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