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Old 12-28-2010, 10:05 PM   #19
CTScott
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Do you by any chance have (and know how to use) a multimeter?
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Old 12-28-2010, 10:32 PM   #20
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Lol. Yeah. Got one at work. And I know how to use it. Funny thing is, who owns one and can't use it. Just joking around. I'm curious to know how YOU know all this stuff tho. Your knowledge base is incredible.
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Old 12-28-2010, 10:42 PM   #21
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Lol. Yeah. Got one at work. And I know how to use it. Funny thing is, who owns one and can't use it. Just joking around. I'm curious to know how YOU know all this stuff tho. Your knowledge base is incredible.
You'd be amazed as to how many people have one laying around, but have no clue as to what to do with it. I'm a EE with 20 years experience in robotics and medical automation.
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Old 12-28-2010, 10:47 PM   #22
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I'm a EE with 20 years experience in robotics and medical automation.
That explains the yaris snow plow. Haha
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Old 12-29-2010, 09:11 AM   #23
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Heater is ok. False alarm. I didn't put the relay in all the way. But about that multimeter....
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Old 12-29-2010, 09:50 AM   #24
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Heater is ok. False alarm. I didn't put the relay in all the way. But about that multimeter....
Here's where to start:

In the picture below (of the headlight stalk connector) measure the voltage on the sky blue wire (next to the pink wire) with respect to either of the white wires with the black stripe.

Headlights off:

Headlights on (low beam):

Headlights on (high beam):


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Old 12-29-2010, 10:59 AM   #25
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voltage numbers

off- 13.8

on- 13.7

hi- .04

that last one seems funny to me, but i'm no pro.
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Old 12-29-2010, 11:14 AM   #26
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voltage numbers

off- 13.8

on- 13.7

hi- .04

that last one seems funny to me, but i'm no pro.
That's fine, now same with the pink wire.
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Old 12-29-2010, 12:00 PM   #27
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uh i did the pink wire first... oops, but i went out and did the sky blue one just now

off- 12.6

on- 0, yes zero

hi- 3.4

???? oh man
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Old 12-29-2010, 01:25 PM   #28
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OK - The off- 13.8, on- 13.7, hi- .04 makes sense for the pink, which is the high beam wire.

The off- 12.6, on- 0, hi- 3.4 is OK for the light blue, which is the low beam.


So, the headlight stalk is working correctly. Next, measure the resistance between terminals 3 and 5 of the H-LP AMT relay (they are the two larger perpendicular to each other terminals).

Also, with the H-LP relay out, measure the voltage between the pin 5 position (the large blade that is perpendicular to the other 3) and ground.
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Old 12-29-2010, 01:46 PM   #29
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Ok. There is no voltage between 3 and 5 on the relay itself. But I am getting 12.88 on the housing ( where the relay plugs into) on 3 and 5. And on 5 and ground 12.88 again
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Old 12-29-2010, 01:52 PM   #30
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Ok. There is no voltage between 3 and 5 on the relay itself. But I am getting 12.88 on the housing ( where the relay plugs into) on 3 and 5. And on 5 and ground 12.88 again
On the relay, measure resistance, rather than voltage between those two pins.
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Old 12-29-2010, 02:06 PM   #31
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ah duh.... resistance is null, nothing at all
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Old 12-29-2010, 03:57 PM   #32
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but if its a relay, shouldnt there be no resistance until 12v is applied to the little prongs?
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Old 12-29-2010, 04:36 PM   #33
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ah duh.... resistance is null, nothing at all
OK that's good. Now, voltage on each of the three headlight wires (on one side is fine)
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Old 12-29-2010, 04:40 PM   #34
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but if its a relay, shouldnt there be no resistance until 12v is applied to the little prongs?
It's a normally open relay, so the resistance is infinite (displayed as OL, null, etc.) Then when the relay is powered, it goes to zero.
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Old 12-29-2010, 04:49 PM   #35
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OK that's good. Now, voltage on each of the three headlight wires (on one side is fine)
doing now
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Old 12-29-2010, 04:55 PM   #36
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brown and green wire on driver side 12.88

white wire nothing... i am testing each wire to a ground right?
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