2006 land cruiser cabin HVAC fan does not run.

[greenmachine93]

Had just replaced the battery and now my fan does not operate. Have checked for blown fuse in the engine compartment and both drivers and passenger side kick panels. No blown fuse. I also checked for voltage at the fan no voltage. Checked for voltage at the fan relay that is located forward of the fan no voltage on any of the contacts. Voltage checks made with fan speed set to high. Also verified that the white hose and connector on drivers side panel under steering wheel are connected. What next?

 

[jerryb]

the lexus version below is the pdf pretty version with colors. IT's mostly all the same. Nothing different related to what you need. There's a resistor somewhere under there by the blower motor controller also.

check all the fuses, meaning remove and clean them, or replace. IF ac is inoperable it wouldn't work anyway, for instance if the magnetic clutch doesn't get a signal I assume neither will the blower. So check and clean all the AC related fuses also.

The wiring book and the fsm volume two are really important for ac work.

 

[greenmachine93]

Still no luck. I just checked system for trouble codes and get code 21

 

[jerryb]

21 is just the solar sensor.

does your rear fan blower work?

 

[jerryb]

#1 on a list for FRONT AC/air flow control/no blower operation is this

 

[greenmachine93]

rear fan and A/C still operate. I will check that relay.

 

[greenmachine93]

looks like relay is shot.

 

[jerryb]

at least that would be easy.

Edit, for completeness sake,
pic.

 

[greenmachine93]

Replaced relay. Nothing, still not working. What is the initialize process the manual says should be done?

 

[jerryb]

nothing that I know of. Just battery reconnects and disconnects.

# 2 from the book

is your clutch on the compressor engaging? like have the rear AC on?
YOu could use techstream to trip the mag clutch relay. I would have done that first thing before getting into book stuff, also fuse, r134 levels battery voltage etc.
anyway.
I wouldn't take the center assembly apart to get at the AC amplifier, it's easy to get to but I'd use the white/red at the blower motor to check vdc.
I'd still bet on dirty fuse, link, mag clutch. There's a whole lot of fuses involved to make that work.

 

[greenmachine93]

Fixed! Connection at fusible link was loose

 

[greenmachine93]

Thanks for the help Jerryb

 

[jerryb]

good deal.

No I didn't go back and edit post 10 . ha

 

[RunningW]

Where was the fusible link? I am having the same issue with my blower.

 

[jabajee]

@jerryb @greenmachine93 - Can any of you help me out with where/how the loose connection on the fuseable link could be fixed? I'm having this same issue. replaced resistor 2x. I've had luck with it running for a couple months with no issues, but now it's back. it will kick on for a few seconds randomly. work for a trip, but then next time I drive it never kicks on. These intermittent electrical issues are going to drive me insane. Not a lot of info out there from what I can find.

 

[jerryb]

you mean the link that hangs off the battery pointing down with big links-fuses on it?
I don't want to go back and revisit or read this.

if you've never taking that piece off and cleaned it in 21 years.... it's time.

 

[jabajee]

you mean the link that hangs off the battery pointing down with big links-fuses on it?
I don't want to go back and revisit or read this.

if you've never taking that piece off and cleaned it in 21 years.... it's time.

Thanks @jerryb . I wasn't sure what was being referenced above the piece you are mentioning, or the block of relays/wiring inside the under hood fuse box. I got a brand new fuse box unit from Lexus, but it doesn't include the section w/ all the relays/wiring which is my worry. I'll start with this. Appreciate the reply.

 

[jerryb]

above mentioned was a heater relay- one of the replaceable ones, and the blower connector + resistor by the main fan.
the fusible link is this. Cheap part for what it controls.

 

[jabajee]

above mentioned was a heater relay- one of the replaceable ones, and the blower connector + resistor by the main fan.
the fusible link is this. Cheap part for what it controls.
View attachment 3822939

Thanks, @jerryb. I took a look at mine yesterday. Looked pretty clean. May order a new one and see where that gets me. I've already replaced the blower relay in the fuse box, blower resistor, and a new blower fan. Still intermittent issues. There has to be a short or something somewhere, I just have no idea where to start, outside of what I've tried already. It kicked on today backing into my driveway for about 30 seconds, then stopped again. first time it's came on in 2 weeks. Less than ideal w/ current temps in Indiana being around zero the last week.