Question about 2003 Chevrolet Impala

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My rear defogger is not workin. i dont see a tear in the lines. i checked the connectors and their great. the realy is good and so is the fuse. so what can i do

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It has burned out

Posted on Jan 03, 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

Rear defogger won,t work


Check basic fuses first.

If the button that works the defogger lights up continue reading.
Many Impalas and Malibus have wiring that corrodes by the passenger side kick panel along the lower side A pillar. There is a connector with many pins that gets ruined. I dunno if malibus have a fuse box here as well like the impalas, but check there. might have to sneak a peek under the carpet. but it takes like 15 minute to check.
very common for defoggers that dont work when the fuses are good and the button lights up.

May 09, 2014 | 2005 Chevrolet Malibu Maxx

1 Answer

Power windows, rear defogger and exterior mirror defogger quit working


IF you checked the fuses and relays, them it sound like it might be wiring or wiring connector might be loose.

Jan 05, 2013 | 1994 Isuzu Trooper

1 Answer

Which fuse do I replace for rear window defogger in a 2001 nissan almera


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.

Dec 30, 2012 | Nissan Almera Cars & Trucks

2 Answers

Need wiring diagram of rear-window defogger circuit for 2008 Chevy Impala LT


i just fixed my car to the exact question above, it took 20 minutes total. yes I\'m good with a wrench, but this fix doesn\'t reqire you to be.

Problem: Rear defroster doesn\'t work, but the fuse is good and the little light comes on on the button.

Answer: Go to front passenger kick panel where the "other" fise box is and remove the pastic panel, it just pops straight up. Under the fuse block is a white plug that connects front wire harness to the rear harness. this is where the problem is. pull the connector off the body, my plugslide straight back. Now flip the whole connector over, there you\'ll see the burnt spot on the plug. losse, corroded connection causes melt down. this stuff happens. my car has a purple wire going into the plug and a black one coming out, this is the rear defroster wire. cut the purple wire aleast a half inch before the plug and cut the black one coming out of the plug the same, always leave a little wire incase you ever want to reuse that terminal, standard rule. now take two butt connectoers and a four inch piece of ten gauge and splice the purple and black wires back together. lots of current so DO NOT use 12-14 gauage wire, it will melt. and Wa-La, its fixed!! since you dont have to do the trouble shooting and chase down the wires like i did, should take you ten minutes to fix.

Now if this doesn\'t fix your car, then don\'t pay me!!

If this DOES fix your car, then take your wife out to dinner with the $150.00 i just saved you from having to take it to the dealer,

(they would sale you new connectors and harness)

Oct 30, 2012 | 2008 Chevrolet Impala LT

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

6 Answers

Hyundai XG350 rear defogger doesn't work. I have changed the relays, checked all the fuses all good, dash switch works because I changed that too. checked the wire to the grid thats' ok too. now what?


The rear defogger is controlled by the Electronic Time and Alarm Control Module (ETACM). It receives a signal from the switch, and if the car is running, turns on the rear window defogger. Most frequently the problem is a blown 30A defogger fuse. Other common problems are the defogger switch itself or the switch not being plugged in properly, but there can also be a bad defogger relay, defective ETACM, or wiring issue. If you're capable of doing some electrical diagnosis, I'd encourage you to register for a free account at www.hmaservice.com (requires Internet Explorer and Adobe SVG Viewer) and print the schematic from the site. Also, does the indicator lamp come on when you depress the defogger button,I hope this help you in the right direction now you know how it works

Feb 12, 2010 | Hyundai XG350 Cars & Trucks

2 Answers

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..

Jan 16, 2009 | 1997 Ford Thunderbird LX

1 Answer

2002 Alero defogger


A common thing to fial on these- assumning the grid is ok, and wires are still attched to grid, is the rear def / antenna module. It is behind rt. rear quarter trim panel. The modules burn up, and also melt the connector. the module and connector would need to be replaced.

Dec 06, 2008 | 2003 Oldsmobile Alero

1 Answer

Rear defogger


check grids along rear window to check for broken lines and check wires on both sides of glass where connections are.

Nov 29, 2008 | 1991 Oldsmobile Cutlass Supreme

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