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2005 Deville Limited Edition
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225 Posts
Discussion Starter #1 (Edited)
2005 Deville -- B0429 for the #3 mix door actuator -- FIXED

still get the code B0429 for the #3 mix door actuator error !

WTF !

OK, so now I need some guidance, can anyone throw some idea's at me to try and fix this.

So, this is what I did....

Pulled fuse 2 and 33 under the rear seat.

I took out the glove box, and removed the actuator (the square one), replaced it with a new one (took 90 mins in total).

Replaced both fuses, turned the key on, waited 1 - 2 mins, turned key off and waited 10 seconds, turned key on and started car.

Checked the codes in DIC, reset them all, turned key off.

Rechecked codes ...... and what the heck ! B0429 still current !

Any idea's ?

UPDATE ...... FIXED ...... See >> http://www.cadillacforums.com/forums/cadillac-deville-1985-2005-including-1985/679193-2005-deville-b0429-3-mix-door.html#post14050961
 

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Administrator
2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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69,906 Posts
Maybe you need to calibrate the actuator. The service manual says to remove the IPM fuse for at least 60 seconds - with the ignition switch OFF.

B 0429 is the door actuator for the rear console air control panel/vent.
 

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2005 Deville Limited Edition
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225 Posts
Discussion Starter #4
I tried that, no go.

Disconnected the battery earth lead for 20 mins, still no dice.

I keep reading on the net that a Tech II scanner is needed to reset / calibrate the HVAC and it's modules (IPCM), can a GM Tech confirm this ?
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
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19,867 Posts
I tried that, no go.

Disconnected the battery earth lead for 20 mins, still no dice.

I keep reading on the net that a Tech II scanner is needed to reset / calibrate the HVAC and it's modules (IPCM), can a GM Tech confirm this ?
====================
a tec2 shouldn't be necessary -

that actuator moves both the #2 - passenger -
and #3 - rear seat - mix doors -

does the #2 door work properly?

does the rear seat control actually change the rear seat air temp?

did you use a new ACDelco actuator?
 

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2005 Deville Limited Edition
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225 Posts
Discussion Starter #6
====================
a tec2 shouldn't be necessary -

that actuator moves both the #2 - passenger -
and #3 - rear seat - mix doors -

does the #2 door work properly?

does the rear seat control actually change the rear seat air temp?

did you use a new ACDelco actuator?
OK, #2 door .... which one is that in the diagram and #3 door ?

The heat control in the rear console ..... it's marginal at best.

I changed out item 18 for a new ACDelco unit.

When I removed the old actuator a metal rod came out with it, I do not see that in the diagram.

If I turn off the passenger controls and use the drivers controls I get hot and cold air in the back but only when the fan is on using the rear control (center control button), the heat control does nothing. The left control that directs the air works fine.

If I set it in passenger mode, the heat setting(s) (using the right up / down button) does not seem to work as far as I can tell. The display shows red for heat and blue for cold when pressed as it should, but the air out the vents does not change in temp.

I have also added the PDF file that details the Tech 2 tool for the B0429 code.
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
Joined
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19,867 Posts
OK, #2 door .... which one is that in the diagram and #3 door ?

The heat control in the rear console ..... it's marginal at best.

I changed out item 18 for a new ACDelco unit.

When I removed the old actuator a metal rod came out with it, I do not see that in the diagram.

If I turn off the passenger controls and use the drivers controls I get hot and cold air in the back but only when the fan is on using the rear control (center control button), the heat control does nothing. The left control that directs the air works fine.

If I set it in passenger mode, the heat setting(s) (using the right up / down button) does not seem to work as far as I can tell. The display shows red for heat and blue for cold when pressed as it should, but the air out the vents does not change in temp.

I have also added the PDF file that details the Tech 2 tool for the B0429 code.
========================
this may help -
http://www.cadillacforums.com/forums/cadillac-tech-tips-how-fix/486513-2002-deville-air-temperature-actuator-replacement.html
 

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Registered
2005 Deville Limited Edition
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225 Posts
Discussion Starter #8
Thanks for the link Basscatt, but it's of no help with the problem. I used that first post as a guide to mine as that is the actuator that I replaced, but the last post in that thread is way off with the diagram as it's for a 97 Deville.
 

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2005 Deville Limited Edition
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225 Posts
Discussion Starter #9
OK, so I did some more checking on this, took it all apart again and found that the metal rod is used to move the door that's numbered 44 in the diagram, this lines up with the center spline in the actuator, the outer part of the spline on the actuator controls the door numbered 19.

The doors have to be aligned by hand so that the metal shaft and the outer shaft of each door are in a set position that corresponds with the markings on the actuator, you will see 2 lines on the actuator for the splines, if they don't line up correctly the code B0429 will be thrown and show up in the DIC.

It took me 3 attempts to get it right, it's a PITA if one of them is out by a little bit.

I now don't get the code, and now the rear heat controls are working as they should.
 

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2005 DeVille
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17 Posts
If you’re still around and can remember the positions please let me know. I’m having the same issue. I’m on my second actuator now. It’s frustrating.
 

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2005 STS V-8 1SF Magneride HUD/ACC, 2008 Escalade ESV 1SZ Y91 Luxury Edition
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1,450 Posts
If you’re still around and can remember the positions please let me know. I’m having the same issue. I’m on my second actuator now. It’s frustrating.
Click the username, then profile. Scroll down you'll see the last time they were logged in. In the case of Ian-STS99, it was 12/18/16. So no, he's not still around.
 

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2000 Deville Base, 2019 Corvette Grand Sport
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1,107 Posts
I put one in last year. Do not plug it in before you put it on the car. You have to install it in the position it comes in.
 
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