Troubleshooting Rear Window Defroster?
#1
Troubleshooting Rear Window Defroster?
So I tried the rear window defroster for the very first time and it doesn't work. The little LED doesn't illuminate and the grid doesn't warm up.
I have vol 1 & 2 of the shop manuals but no electrical diagrams, plus the owner's manual. I did as much troubleshooting as I could but got nowhere. I'd appreciate any suggestions if anyone else has been through this.
Here's what I checked so far:
Thanks for any help with this. I'll probably never need to use the rear defroster again, but it bugs me to know that it's not working, so I'm determined to fix it.
I have vol 1 & 2 of the shop manuals but no electrical diagrams, plus the owner's manual. I did as much troubleshooting as I could but got nowhere. I'd appreciate any suggestions if anyone else has been through this.
Here's what I checked so far:
- Scangauge shows no DTC's
- Both fuses are good (#28 in BJB and #10 passenger side fuse panel)
- Connections to heater grid are good
- Have continuity through the heater grid
- Left side of heater grid is grounded
- No voltage on the right side of heater grid when I activate the switch
Thanks for any help with this. I'll probably never need to use the rear defroster again, but it bugs me to know that it's not working, so I'm determined to fix it.
Last edited by econoline; 03-30-2011 at 09:40 PM.
#3
Re: Troubleshooting Rear Window Defroster?
I don't think this relay is in the BJB. There are 7 relays and 32 fuses in the BJB, but none of the relays are related to the defroster function. The relays are:
- Power sustain
- PCM power
- Injector
- Aux collant pump
- Motor/Electronic collant pump
- Foglamps
- A/C clutch
Good tip about checking voltage at the fuse. I found the FEH wiring diagrams on eBay for $5, so that is on the way and might help with this.
#4
Re: Troubleshooting Rear Window Defroster?
Bill,
I don't think this relay is in the BJB. There are 7 relays and 32 fuses in the BJB, but none of the relays are related to the defroster function. The relays are:
Good tip about checking voltage at the fuse. I found the FEH wiring diagrams on eBay for $5, so that is on the way and might help with this.
I don't think this relay is in the BJB. There are 7 relays and 32 fuses in the BJB, but none of the relays are related to the defroster function. The relays are:
- Power sustain
- PCM power
- Injector
- Aux collant pump
- Motor/Electronic collant pump
- Foglamps
- A/C clutch
Good tip about checking voltage at the fuse. I found the FEH wiring diagrams on eBay for $5, so that is on the way and might help with this.
GaryG
#5
Re: Troubleshooting Rear Window Defroster?
Bill,
I don't think this relay is in the BJB. There are 7 relays and 32 fuses in the BJB, but none of the relays are related to the defroster function. The relays are:
Good tip about checking voltage at the fuse. I found the FEH wiring diagrams on eBay for $5, so that is on the way and might help with this.
I don't think this relay is in the BJB. There are 7 relays and 32 fuses in the BJB, but none of the relays are related to the defroster function. The relays are:
- Power sustain
- PCM power
- Injector
- Aux collant pump
- Motor/Electronic collant pump
- Foglamps
- A/C clutch
Good tip about checking voltage at the fuse. I found the FEH wiring diagrams on eBay for $5, so that is on the way and might help with this.
Yes, the relay is in the SJB! Yes, the diagram needs some darkening and contrast for sure. Well, I tried... Okay, that's much better.
Last edited by wptski; 04-01-2011 at 09:29 AM.
#6
Re: Troubleshooting Rear Window Defroster?
Bill, thanks! That's a very useful diagram and I can do some voltage checking from there. My guess is the problem will be in the SJB and I really don't want to try removing that.
Gary, thanks for the tip on rebooting, and I'll give that a try. Will I lose any configuration data if I reboot? [Nevermind, found the answer in the owner's manual in the section about replacing the battery]
Gary, thanks for the tip on rebooting, and I'll give that a try. Will I lose any configuration data if I reboot? [Nevermind, found the answer in the owner's manual in the section about replacing the battery]
Last edited by econoline; 04-01-2011 at 11:46 AM.
#7
Re: Troubleshooting Rear Window Defroster?
Bill, thanks! That's a very useful diagram and I can do some voltage checking from there. My guess is the problem will be in the SJB and I really don't want to try removing that.
Gary, thanks for the tip on rebooting, and I'll give that a try. Will I lose any configuration data if I reboot?
Gary, thanks for the tip on rebooting, and I'll give that a try. Will I lose any configuration data if I reboot?
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