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Old 11-21-2009, 03:20 PM   #1 (permalink)
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I have a 2000 Taurus SE-S with Duratec. My rear defrost is not working. I do have an aftermarket Metra kit for the HU. My rear defrost recently stopped working. No light on the button and no click from the dash.

I can't seem to get the relay to make that click noise when I press the button. I am trying to figure out if the relay itself is faulty.

I tied a wire into Relay Pin #85 & #86. I hooked up the multimeter and I had 3mV steady as well as .03mA. I also got a 92Ohm reading.
Then I tied a wire to Relay Pin 30 & 87. I got 13.84V and 3.39 mA. 0 Ohms. The readings were slightly lower when I turned the car off.
When I tied 30 & 87A there were no discernible differences between 87 and 87a.

Are these readings normal? ARe there other tests I need to run?

Nothing happened to the readings when I pressed the defrost button.

Thanks for any help!
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Old 11-21-2009, 07:07 PM   #2 (permalink)
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pull the relay out and get a 9 volt battery. look at the relay and you'll see a diagram of the insides and the pins are numbered. use an ohmmeter over the two switch pins and put the 9 volt over the two coil pins. should read near 0 - .1 ohms. and you'll feel/hear it click.
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Old 11-22-2009, 11:22 AM   #3 (permalink)
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Thanks a lot! The relay seems to work just fine. (It clicks, and I got a .1 Ohm reading)

That sucks, because I was hoping I'd have an easy fix for my problem.

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Old 11-22-2009, 12:28 PM   #4 (permalink)
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I can only assume you checked fuses, but if not, fuse 232 10amps, fuse 207 40amps, fuse 212 10amp. You have to have all for the circuit to work.
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Old 11-23-2009, 07:54 AM   #5 (permalink)
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Ive only checked two of those fuses...where is the other 10amp?

According to my manual,
Fuse #7 is the 40 amp Rear Defrost Grid Feed.
Fuse #12 is the 10 amp heated mirrors and Rear Defrost Switch.
Fuse Position #9 is the relay itself.

Where is the other 10 amp fuse? (I'm assuming #207 is the 40amp and 212 is the 10amp mentioned above. My fuse position #32 is ABS, DRL Relay Coil, Speed Control Actuator, Traction Control Switch, AC Heater Selector Swicth, Blend Door Actuator, Brake Shift Interlock

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