I tested the relay for the blower motor (the one you're holding in the writeup). This one, unlike in the aforementioned relay test write-up, is a four
-pin relay that is normally open
. It'* also in a little plastic case to make installation easy, deinstallation tricky (there'* a tab on the top), and testing a bit of a pain, unless you have four hands. (I do not.)
First, if you peer inside, there are numbers next to the pins. Now take a look at the schematic on the top of the relay. It will look like the one in Danthurs' writeup, but different. You can see the control circuit on pins 85 and 86, diodeless, and the current flows through pins 30 and 87:
- Set your voltmeter to 200Ω, and touch pins 30 and 87. This relay should show infinity, as it is open when the control circuit is low.
- Take a fresh 9V battery, and wire it up to pins 85 and 86. (As it'* diodeless, you can hook it up in either direction. I did, just to make sure.) You should hear a click. Now, if pins 30 and 87 read close to 0Ω, your relay is good. Put it back in the car.
Guess I'm replacing the blower motor. I know I'm not going another New England winter without a defroster. Scraping ice off of the inside of my windshield is not how I'd like to spend the next four months.