AC Mag Clutch relay no power

Joined
Mar 13, 2021
Messages
6
Location
Phoenix, AZ
I am trying to figure out a no AC issue on my 2000 Lx470.

Here is what I know:
AC light button light is flashing.
AC fuse in the main relay/fuse box in the engine bay is working and getting 12v.
I am getting NO voltage at the MAG Clutch relay.
Jumping the clutch from the magnetic clutch relay with the engine running engages the clutch and I get cold air.
I have no continuity from the AC 20amp fuse and the coil or control side of the magnetic clutch relay.
All other fuses that I can find are working.

Is there a connector that I’m missing? Where is the split in the first photo? That seems to be the only way that continuity can be broken from the fuse to the relay.

Any help is appreciated. Thanks!

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F5B485BC-3FE0-47B9-B5A7-23ACDD5056AC.png


92E6C53A-165D-4160-BEEF-2E55AFC21A77.png
 
Joined
Sep 9, 2016
Messages
2,126
Location
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The "B" wire with R-L is the control side correct?
Did you check for any corrosion on this 20A fuse pins? This same fuse looks like feeding the Vent models/front heater/blower (H,I and J wires: I and J via meter relay) Any functionality issues with these?
 
Joined
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Messages
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The "B" wire with R-L is the control side correct?
Did you check for any corrosion on this 20A fuse pins? This same fuse looks like feeding the Vent models/front heater/blower (H,I and J wires: I and J via meter relay) Any functionality issues with these?
I double checked the fuse, it is good. I do not know where the MTR relay is, so I can’t check the functionality there. I am trying to avoid taking the power distribution box apart as this is a hassle. I did some work adding a bumper and lights it the ac worked for a minute after I was done, and now it doesn’t.

B51F142F-73E3-4152-935A-087465B18AA8.jpeg
 
Joined
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Messages
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Wires don't break on a toyota unless someone mess with the wires.

Check the AC pressure switch wire/wire plug. This is located right below the small headlight on Driverside.
 
Joined
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Wires don't break on a toyota unless someone mess with the wires.

Check the AC pressure switch wire/wire plug. This is located right below the small headlight on Driverside
Wires don't break on a toyota unless someone mess with the wires.

Check the AC pressure switch wire/wire plug. This is located right below the small headlight on Driverside.
I figured it out. See the picture below. This one connector wasn’t 100% engaged. Once I plugged it in, everything came back oneline.

AEF0BE20-C138-4477-BADB-4F0F36EA2B8F.jpeg
 
Joined
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Messages
2,126
Location
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What's with that connector?
 
Joined
Sep 9, 2016
Messages
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Location
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It was loose. That’s the connector in the wiring diagram that I was looking for. Now if I can figure out why my horn is stuck on after last night’s rain…
Check the horn relay (not sure where it is) it might have gotten wet and made the bridge between the load side.
 
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Mar 13, 2021
Messages
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Phoenix, AZ
Check the horn relay (not sure where it is) it might have gotten wet and made the bridge between the load side.
First place I went. There is a short to ground at the control side of the relay. I have a feeling that it has something to do with the security system. Does anyone know where the factory antitheft module is?
 

hoser

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Dec 21, 2003
Messages
10,537
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Bay Area, CA
If the AC is low on refrigerant, the clutch won't engage (to prevent you from killing the compressor).

First and foremost, obtain and read the HVAC codes. Goes something like this:

Hold the AUTO and Recirculated air button while turning the key from OFF to ON. Search for codes or see FSM.
 

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