AC magnetic clutch relay location on 2003 LX470

[Bull Moose 100]

Hey Guys,

I can not see a relay called MG CLT any where in my engine relay box. I'm stumped...

The 2004 toyota landcruiser FSM says the relay is in the box.

Does the HTR Relay control the magnetic cluth, the heater, and the rear heater?

 

[vcheng]

Hey Guys,

I can not see a relay called MG CLT any where in my engine relay box. I'm stumped...

The 2004 toyota landcruiser FSM says the relay is in the box.

Does the HTR Relay control the magnetic cluth, the heater, and the rear heater?

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You may find this thread helpful. Please go through both pages before deciding what to do:

2005 LX470 Main Junction Block Replacement

 

[Bull Moose 100]

Ok, I see that the relay is built into the black junction box. Is there any way to test the relay without disassembling it?

I have tech stream software, but I don't see anything for AC on there. Should there be?

 

[vcheng]

Ok, I see that the relay is built into the black junction box. Is there any way to test the relay without disassembling it?

I have tech stream software, but I don't see anything for AC on there. Should there be?

There is a test setting for engaging and disengaging the AC clutch to test the relay circuit.

 

[Toy12HT]

Hi Vcheng, I have an 06 100 series with a suspect Magnetic Clutch relay. Could you elaborate a little on how to test the relay without having to pull the fuse box to piesces? Also if anyone has the part number for the hardwired relay that would be good as well. Thanks

 

[vcheng]

Hi Vcheng, I have an 06 100 series with a suspect Magnetic Clutch relay. Could you elaborate a little on how to test the relay without having to pull the fuse box to piesces? Also if anyone has the part number for the hardwired relay that would be good as well. Thanks

The relay can be tested by powering the magnetic clutch directly and checking the AC for operation, showing that everything but the relay is in good working order. There are only two types of Denso relays inside the main junction block, little black ones 156700-1081 and larger brown ones 156700-2411.

 

[Bull Moose 100]

The relay can be tested by powering the magnetic clutch directly and checking the AC for operation, showing that everything but the relay is in good working order. There are only two types of Denso relays inside the main junction block, little black ones 156700-1081 and larger brown ones 156700-2411.

I disagree with all of this.

Just because you can give power to the magnetic clutch and the compressor works, does not mean that the relay is bad.

You can test the relay with tech stream software of you can find a copy.

On some model years, the relay is located inside of the main junction box and is Not serviceable. You can not see it, you can not simply remove it or replace it. You must completely replace the entire junction box.

 

[2001LC]

04LC

 

[vcheng]

I disagree with all of this.

Just because you can give power to the magnetic clutch and the compressor works, does not mean that the relay is bad.

You can test the relay with tech stream software of you can find a copy.

On some model years, the relay is located inside of the main junction box and is Not serviceable. You can not see it, you can not simply remove it or replace it. You must completely replace the entire junction box.

Disagree all you want Sir, I have no problem with it.

2005 LX470 Main Junction Block Replacement

So I finally bit the bullet and replaced the main engine room junction block to cure the intermittent AC operation. For this year, the AC relay cannot be replaced separately as it is built into the junction block itself. The replacement part number is Toyota 82720-60081 with a list price of...

forum.ih8mud.com

 

[Bull Moose 100]

Disagree all you want Sir, I have no problem with it.

2005 LX470 Main Junction Block Replacement

So I finally bit the bullet and replaced the main engine room junction block to cure the intermittent AC operation. For this year, the AC relay cannot be replaced separately as it is built into the junction block itself. The replacement part number is Toyota 82720-60081 with a list price of...

forum.ih8mud.com

That's the part number for the entire junction box, not the AC relay

 

[Bull Moose 100]

Oh, that thread has new info since last time I read it.

 

[vcheng]

Oh, that thread has new info since last time I read it.

Exactly.

 

[Bull Moose 100]

What do you think of my AC issue on this thread?

AC won't turn on, but techstream can activate the compressor

I got a 2003 lx470. The AC doesn't work, but I can use the tech stream software to activate the compressor and I get cold air coming out of my vents and there are no error codes that I can see. Has anyone heard of this before? I even brought it to a mechanic and he said the pressure is correct...

forum.ih8mud.com

I can activate the compressor via Tech stream, but not through the normal controls. The temperature reading I get on my Nav is accurate for the outside air temp. Setting it to Max cool does not engage the compressor.

 

[vcheng]

What do you think of my AC issue on this thread?

AC won't turn on, but techstream can activate the compressor

I got a 2003 lx470. The AC doesn't work, but I can use the tech stream software to activate the compressor and I get cold air coming out of my vents and there are no error codes that I can see. Has anyone heard of this before? I even brought it to a mechanic and he said the pressure is correct...

forum.ih8mud.com

I can activate the compressor via Tech stream, but not through the normal controls. The temperature reading I get on my Nav is accurate for the outside air temp. Setting it to Max cool does not engage the compressor.

I had the same issue, and a new MJB fixed it on my truck. However, before you go this (expensive) route, try to dig out the clutch relay and run wires from its terminal to the outside of the MJB and set up a conventional and easily replaceable relay. This would be a hassle, but you would be out only $10. Worth a shot IMO.

 

[2001LC]

Anything else inoperable, ANYTHING at all?

 

[jerryb]

That picture makes me laugh everytime Paul. @2001LC

 

[Bull Moose 100]

I had the same issue, and a new MJB fixed it on my truck. However, before you go this (expensive) route, try to dig out the clutch relay and run wires from its terminal to the outside of the MJB and set up a conventional and easily replaceable relay. This would be a hassle, but you would be out only $10. Worth a shot IMO.

Tech stream is using the relay to give power to the compressor... How is the relay broken? Is there something goofy going on?

 

[2001LC]

You remember that one, do you @jerryb It had more INDY shops, Toyota Dealerships and mechanics try and get that AC working than I can count on one hand, and by two different owners. They did everything, and threw a ton of parts at it. But cutting open the fuse box, was something I'd not have the heart to do. Don't know why they didn't just listen for relay to kick in, they're loud.

I'll bet they spent over $5K trying to get that AC working and couldn't.

I was pretty proud of diagnosing that AC

I did a windshield wiper & washer diagnosis the other day. I didn't write that one up. It was another one none could get diagnosed. Scary it's like the 100 series talk to me They like me I guess!

 

[vcheng]

Tech stream is using the relay to give power to the compressor... How is the relay broken? Is there something goofy going on?

My hypothesis is that the relay operates intermittently long before it ever fails completely, causing the problems. I tried everything before biting the $500 bullet to keep the spousal unit cool and comfortable for my own sake.

 

[jerryb]

I'd buy a new box. Just my opinion but getting all those new relays, new clean connections and connectors and new fuses etc, seems like an easy fix. Isn't there 5 relays under there?