The rear windshield defrost is not working on my 2012 Chevrolet Malibu. The light turns on when I press the button, but snow is never melted. I checked the fuse located in the trunk fuse panel, and it is still good. In addition, the fuse has power when the rear defrost is turned on. Any suggestions on what to try next? Does anyone know where the wires are connected to the window? I'd rather not tear things apart unnecessarily. Thanks!
In a pinch you can get a small 12 volt heater for up on the back deck to work in place of the window setup.. the connections at the base of the window may be coroded from moisture or whatever..these wires are very small.. corrosion/rust will kill it.. may need to have a car window place look at it..or a body shop..
Testimonial: "Thanks for the suggestions. I just wish I knew which side of the window to start looking at, since all of the connections are hidden."
I don't think its supposed to clear off snow, only fog or condensation. Try to remove the snow, and see if it will clear the fog. The wires connecting the defroster to the window should be on the side of the window, or behind a cover somewhere. Look for something like this:
OR:
Testimonial: "Yeah, it doesn't clear anything off (fog, ice, snow, etc.). The connections are hidden, so unfortunately I'm going to have to rip off some plastic molding to be able to get to them I think."
SOURCE: 1998 buick park ave. rear window defroster not working
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.
SOURCE: Rear Windshield Wiper Problems
Check the wiper motor connection if its touching anything and loose it will automatically ground out and check at connection make sure you put some gel and then snap it in/ Please rate my response thank you very much
SOURCE: Rear window defroster does not work
SOME DEALER MAKE A SMALL REPAIR KIT FOR THIS TO DETERMINE IF BROKEN GRID AND REPAIR, CHECK WITH DEALERS FIRST
8,035 views
Usually answered in minutes!
×