06 rear blower won’t cut off with ignition

[Roindhouse]

I’ve got a couple problems all of a sudden with my 06 expy limited with electronic front temp control

the front blower only works on high, which my Google fu tells me is the blower control module

but here’s the weird one:
the rear blower speed control works ok, but the blower will not shut off when you turn the ignition off

it has to be switched off at the control on the ceiling

 

[BlackCoffee]

I remember a few years ago, I had the same problem with the front blower speed control. It was a $78.00 relay that is behind the glove box. Didn't take long. If you need more info, I might be able to find it in the shop manual.

I'll pull the wiring diagram on the aux blower and see if I can find something.

I pulled the wiring diagram. It appears there is a rear blower motor relay similar to the front blower speed control. If the relay fails closed, it would create the problem. According to the wiring diagram, it is feed with a line that is "Hot all the time."

 

[BlackCoffee]

Here is the diagram.

 

[Roindhouse]

thanks
i figured its gotta be a relay stuck in the "on" position which seems like a fire hazard to me.


any idea where this relay is located?

I got a used front blower module at a junkyard for $25 and cured that.

does the rear one have a module?

 

[Hamfisted]

The Aux relay box is located behind the trim panel and just in front of the right rear tire hump. Forward of the rear HVAC box itself.

 

[Roindhouse]

The Aux relay box is located behind the trim panel and just in front of the right rear tire hump. Forward of the rear HVAC box itself.

thanks for the pic!
I removed the panel so I can access the relays, but the relays are engaged all the time, even with the ignition switched off.
if I remove them , they click off, and if I plug them back in they click on again.

I pulled fuse 107 in the front passenger kickpanel to kill the power to the rear blower and keep it from draining the battery.

the DVD player is also making weird noises all the time.
Im guessing there is another larger relay up front or under the hood that powers the three relays in the back for the AC?

anyone know where that relay is?

 

[Hamfisted]

The rear blower relay gets it's power from fuse #107 there in the fusebox at the passenger kick panel. Fuse 107 is HOT all the time. It is the only one in that segment that is HOT all the time. If voltage is getting past that rear blower relay, it is the relay itself that is sticking. Try another relay in that spot.

 

[Roindhouse]

The rear blower relay gets it's power from fuse #107 there in the fusebox at the passenger kick panel. Fuse 107 is HOT all the time. It is the only one in that segment that is HOT all the time. If voltage is getting past that rear blower relay, it is the relay itself that is sticking. Try another relay in that spot.

none of the three relays in the rear are sticking.
ive swapped them around, and I can hear them clicking when they are plugged/unplugged.

in the rear, the three relays are arranged with two next to each other and the third in another row by itself.
this single one apparently controls the other two, if i unplug the single relay the other two no longer click. but the relay in the row by itself is on all the time even with the ignition off.
and that relay is engaged even with fuse 107 pulled.
where does this relay get its power?

I can hillbilly engineer around this, by installing an additional relay controlled by the ign switch, but somethings wrong, this relay should not be getting a signal to engage all the time.

the control on the roof and on the rear of the console work, and will turn the blower off, but it should go off when the ign is off

 

[Hamfisted]

Yeah, should only run with the key in the RUN position. I'll dig into it further and see what I can find.


Can you post pics of what you're seeing ?

 

[Roindhouse]

Yeah, should only run with the key in the RUN position. I'll dig into it further and see what I can find.


Can you post pics of what you're seeing ?

lemme try with the pic.

the relays in the rear, the one that is powered by fuse 107, its trigger is a yellow wire with a red stripe , that wire is always hot.

i tracked the wire and it comes up front and bypassses the fuse box and goes tward the center of the dash. thats as far as Ive gotten so far.

and ive not had any sucess in finding a wiring diagram online.

 

[Roindhouse]

this is the trigger wire for the blower motor relay

the blower power from fuse 107 is the one just to the top and right of the test probe

ignition switch is off

this trigger wire is powered by fuse 5 which runs the front climate control system, I can hear a blend door or something groan, in the front by the trans hump when fuse 5 is removed and installed
why is fuse 5 hot all the time?

im guessing a problem with the main automatic temp control on the dash?

 

[Hamfisted]

But you say that the front blower turns off as it should when the key is turned off ? Does the AC head unit turn off as it should? I wonder if the front head unit is suspect.

Fuse #5 powers the front head unit. It's just hot all the time. Not sure why.

If you go in the fusebox there at the passenger kick panel and pull the front blower relay out what does the rear aux blower do? 'Cause my Ford manual ( wiring diagram book...) shows the yellow/red wire coming off the front blower relay there in the fusebox.

 

[Roindhouse]

correct, the front blower shuts off when the ign is switched off, and the temp control panel goes off.

pulling the front blower relay, #6, doesnt affect the rear blower.

i cant see real good behind the fusebox, but it looks to me like the yellow/red wire from the rear bypasses the fusebox and goes to the center of the dash.

 

[Hamfisted]

That's Ok, I can't read wiring diagrams real good anyway. It's kinda pointing to the EATC head unit maybe being at fault? Since you're also hearing all the noise from the door actuators groaning. Did they happen to have one at the salvage yard you could try ?

 

[Roindhouse]

I can check, although the hillbilly in me just says cut the yellow wire near the fusebox and add a relay with a trigger from a nearby wire that is activated by the ign

happened at the same time that the front blower speed control went bad.
and the battery went dead and wouldnt take a charge.
maybe a voltage spike or something?

also the DVD player in the roof was making some weird noises when the ign was turned off.

which fuse runs it?

I got all kinds of gremlins.

 

[Hamfisted]

There's not a DVD in the unit is there? You can drop it down and unplug the harness pretty easy.
If you can get a EATC head unit from the salvage yard or eBay I'd do that before rigging up more relays and risking more problems.

I imagine you have the dual zone head unit on your A/C ?

 

[Roindhouse]

no DVD but its always hunting for it.

yes the front AC has the fancy dual zone auto temp control

do you know what year dash controls are compatible with an 06?

all this makes me miss my old cars with the knobs and cables and no computers.
we got this one cheap last year, $3,500 from the guy that paid $51K for it new in 2006, only has 90K miles on it.

 

[Hamfisted]

I don't know what color your interior is, but the overhead DVD players are still available for the Gen2 Expies. But if nobody is ever back there that would use it I would just unplug the harness at the player and be done with it.

That's a great price for a low mileage '06. Except for the cam phaser / timing chain problems the early 3V motors had you should get many years out of it. My '03 2V motor has 215k on it.

 

[Roindhouse]

No one ever uses it.wish it wasn’t there,
I’ve bashed my head on it several times
But I plug my iPhone into the aux port for music and podcasts thru the speakers
Should be able to get a Bluetooth adapter to take the place of the CD changer in the console.
I did that with the wife’s 99 beetle, replaced the CD changer with a Bluetooth
Just spent more than it’s worth to replace the clutch and timing belt, but you can’t find a turbo diesel 5 speed beetle in good condition, and we’ve had this one for 12 years.

This expy spent its life sitting next to the ocean in Florida
So it’s crusty.
There’s no visible rust on the body but one of the hood hinges just came off the fender cause the fender was so thin.
I buy vehicles that are 6-8 yrs old, usually at an auction with around 100k on em, drive them to around 200-250k and sell it for whatever I can get.

my brother does just the opposite, he buys a brand new 4wd suv or crew cab every 4 years.

 

[Roindhouse]

Ok I think it’s fixed

I replaced
The front speed controller with a new one and that solved the problem with the front

I replaced the electronic control panel in the dash with a used one from a junkyard and now the rear one cuts off when you cut the ignition off

also had to replace the battery
Dunno if the car had some kind of power surge from the battery shorting out or what

weird and weird