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1998 Saturn SL2 Rear Defogger
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Acyd69
New User
Dec 2, 2008, 2:22 PM
Post #1 of 2
(6846 views)
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1998 Saturn SL2 Rear Defogger
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Hello and thanks for having this forum.
1998 Saturn SL2 4 cyl with ~123,000 miles.
As the weather has grown colder in my area I have tried to use my rear defogger and found that it did not work. The most recent work was a stereo install by Best Buy Mobile about 6 months ago.
When the car is running and the rear defogger switch is pressed the indicator light (LED) fails to light up. I have checked the fuses (all intact and no indication of corrosion) and replaced the relay. I did not see any indication that the defogger was working when the window had been fogged/frosted. I have read through my Haynes Repair Manual and gotten in the back seat with a volt meter, but was unsure how to hook everything up (and even if the defogger was even on) in order to check voltages.
Is there something I am missing?
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DanD
Veteran
/ Moderator
Dec 5, 2008, 8:17 AM
Post #2 of 2
(6833 views)
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Re: 1998 Saturn SL2 Rear Defogger
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Have you checked both the 30amp maxi fuse in the under hood fuse junction box and the 10 amp mini fuse in the under dash fuse junction box?
Do you hear the relay click when you push the on/off button?
With the indicator light not coming on, when you push the switch; there likely isn’t any power being sent to the rear window from the relay. In other words the relay likely isn’t being turned on for some reason?
We have to find out why the light isn’t coming on first, before we begin dealing with the rear window and that’s only if we need to deal with the window at all?
If you know the fuses are good, pop the switch out of the dash pod.
You should have a 4 wire connector at the switch; brown, black, white and Lt blue.
Unplug the switch; the terminals of the switch should be marked with letters; K (brown wire), J (white wire), D (Lt blue wire) and H (black wire).
Connect an ohmmeter across terminals D & H of the switch and then push and hold the button.
The ohmmeter should show continuity (connection) as long as you’re holding the button.
This system also uses the “chime” module, which is also a timer, to automatically turn the defogger off after 15 minutes.
I’ve had a few of these fail and not allow the system to work. The module is the grounding switch for the indicator light and the relay’s pull-in coil.
You’ll find the chime module in the instrument panel junction block (under dash fuse box)
The test procedure for the module is two steps and this right from my service manual.
Step 1- Check all other components that they are functioning as intended.
Step 2- If no faults found in other components replace chime module with known good.
In other words there isn’t a specific test for the module; if everything else looks ok try a new one.
Thank you very much GM. LOL
Dan.
Canadian "EH"
(This post was edited by DanD on Dec 5, 2008, 8:28 AM)
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