Park Brake light stays on when Brake is activated. 2006 Dynasty.

[rustykramermetalfab]

This happened to me a year ago and then "fixed itself".  Now it is back.  Brake is released and brake light will constantly flash while moving.  The first time I asked I was advised a pressure switch could be the issue but the next time I drove the coach the light would go out. I have been on two other trips without issue.   I see what might be 3 pressure switches in the front bay shown in photo.  There is no switch near the on/off air valve and I do not see one under the dash area yet.   Any thoughts appreciated. I have looked in my manuals and electrical schematic book but have not found help there. Coach is 2006 Dynasty. 

Edited May 8, 2024 by rustykramermetalfab
forgot info.

[Larry Laursen]

The pressure switch on the right in the lowest photo looks similar to the Nason switch mounted on the bottom of my park brake valve.  You may be able to test it by disconnecting the wires and/or connecting the wires to simulate the switch opening and closing.  You can go on the Nason website to see if they have a similar unit.  I have an 05 Endeavor and the switch comes with a pigtail and connector.  It looks like yours has terminals.

[rustykramermetalfab]

On 5/8/2024 at 7:36 PM, Larry Laursen said:

The pressure switch on the right in the lowest photo looks similar to the Nason switch mounted on the bottom of my park brake valve.  You may be able to test it by disconnecting the wires and/or connecting the wires to simulate the switch opening and closing.  You can go on the Nason website to see if they have a similar unit.  I have an 05 Endeavor and the switch comes with a pigtail and connector.  It looks like yours has terminals.

Larry Do you think that the switch I am looking for should only have two wires? one to each terminal?    The switch on the far right has more than that. 

There are two other similar that have only one per terminal they are blocked by the convoluted wire protectors. 

[Larry Laursen]

The switch looks like a Nason switch as shown in the picture.

low_pressure_switch_SM.pdf

[rustykramermetalfab]

Larry, Thanks you sir! SO glad to have you guys that have been around this stuff help out. 

Very much appreciated.

[rustykramermetalfab]

Just an update on this issue.  I was able to peel the foil part number sticker from the switch and flake off Monaco's paint.  I tested the switch with no pressure and the terminals are connected. This is correct according to Nason for the part number this is.  I cleaned the switch terminals and all the wire ring terminals. I need to test if it will disconnect with PSI applied. I plan to set it up to Bench test. If that disconnects I will need to search for another pressure switch.  

[rustykramermetalfab]

Bench tested the Nason switch and it is good to go. Search for the proper switch continues. 

[jacwjames]

@Frank McElroy

Do you know if there is a Nason type switch for the park brake circuit under the drivers side console?   I've scanned through the PDF copy of the wiring schematic for an 06 Dynasty and found the wiring connections for the dash which shows the park brake but can't find where it goes to. 

I have one on my park brake and this is what provides a signal to my park brake light. 

Another 2002 Windsor owner had the same problem last year and I was able to help him, finally narrowed it down to the Nason switch which he bought from Radwell International and that solved his problem.

[Tom Cherry]

1 hour ago, jacwjames said:

@Frank McElroy

Do you know if there is a Nason type switch for the park brake circuit under the drivers side console?   I've scanned through the PDF copy of the wiring schematic for an 06 Dynasty and found the wiring connections for the dash which shows the park brake but can't find where it goes to. 

I have one on my park brake and this is what provides a signal to my park brake light. 

Another 2002 Windsor owner had the same problem last year and I was able to help him, finally narrowed it down to the Nason switch which he bought from Radwell International and that solved his problem.

Not Frank...  BUT, if you are referring to what the Nason switch does...  It, I think, from looking at a number of circuits, provides a GROUND signal.  That Ground Signal then goes to the DASH LIGHT.  Remember, or at least I THINK for ALL dash idiot lights, the ON signal is a GROUND. So, when you engage the PB, you get a signal to light up the Park Brake light.

Next up, that Ground signal also goes to a relay or other "interlock" device on the Slide Control circuits. There are a zillion (OK an exaggeration, but probably 20 different boards or circuits) that Monaco used. Some were home brew, others were Lippert Control boards as well as maybe a KIB one.  One of the key components for any slide (living, bedroom or genny) is that the PB is energized.  That Ground signal then allows the control circuits for each slide to function.

There MAY be other downstream issues...but generally, from all my scrounging around circuits....the Nason switch had two KEY functions....

Frank may (and will probably) be more knowledgeable.  If that's your question...as I interpret it....that's my take.

[jacwjames]

@Tom Cherry

Thanks, the OP of the post is having trouble with the park brake light staying on.  Hopefully he'll chime in on this, he is also posting to IRV2 but getting little help there.  Just trying to get more eyes looking at it. 

[jacwjames]

@Tom Cherry  @Frank McElroy

The OP has been posting on IRV2 with few responses.  I've suggested he move back over to the Monacoers site, he's been struggling with this issue since May of last year. 

His system is different then mine, I have a Nason switch on the bottom of the Park Brake plunger, his does not.  I looked at the wiring diagrams and could not find a section showing the Nason switch but I did find the Actia page showing the wiring connector with the Park Brake wire.   I assume (and you know what happens when you do that) there is a nason or similar type switch.  The OP thinks it is in the 3rd picture he posted in the first post, it is the top switch.  Is this correct, it this the park brake. 

My park brake light does get a signal from the nason switch under the plunger but it also interacts with two relays and fuses in the #2 Monaco box in my front run bay.  I could not find anything on his 2006 wiring for the dash light. 

Any suggestions. 

[Tom Cherry]

Print 38060376 Leveling HWH as the Park Brake Switch input on the connector.

If you pull the 2008, the Power Gear Leveling box has a signal from the Park Brake circuit.  That is print 38070922

I THINK...and Frank is the expert...  That there is a Parking Brake Signal from the switch.  It goes to the Dash Cluster and feeds the Medallion Gauge set.  When the Signal is made...  That turns ON the Parking Brake Light.  I don't know about the alarm, unless there is a "logic" module in the Medallion that says.  HEY...you just started the engine and the Tranny is sending a signal that your put it in gear...and the PB signal says you did not "disengage" the PB.  Dum Dum....fix this.....

There is also, I think a signal the goes to the Intellitec CPU that tells the system when to allow the slide out modules to work.

The Dynasty is more of a Gee Whiz electronically controlled item.

But, the Signal from the SWITCH, is, I THINK, supposed to be a GROUND.  If you check the incoming signal to the switch...it should be a Ground.  When the Switch is ON....as engaged, the outgoing signal should be a GROUND.  If you disconnected each terminal....one should, I think, be a ground.  The other is "open". If you jumpered the switch an put incoming ground to outgoing....then the light would come on...

That's my layman's take with a smattering of running down issues on the Dynasty. The Dynasty also has magnetic switches on the Genny Door.  All those go into the "brain" of the HWH.  All have to be "correct" for the slides to work.

That's it...

 

[Frank McElroy]

On 1/8/2025 at 7:37 AM, jacwjames said:

@Frank McElroy

Do you know if there is a Nason type switch for the park brake circuit under the drivers side console?   I've scanned through the PDF copy of the wiring schematic for an 06 Dynasty and found the wiring connections for the dash which shows the park brake but can't find where it goes to. 

I have one on my park brake and this is what provides a signal to my park brake light. 

Another 2002 Windsor owner had the same problem last year and I was able to help him, finally narrowed it down to the Nason switch which he bought from Radwell International and that solved his problem.

Larry already posted the correct answer.  A two wire Nason pressure switch.  The Dynasty with the Intellitec house multiplex system is different than coaches like the Windsor with a 3 wire Nason pressure switch.

[rustykramermetalfab]

I have replaced the switch shown (Old switch actually tested fine) and the P light still will not go out. I had posted this previously also but wanted to make sure you all knew that.  These are the only Nason air PSI switches Shown in the photo that I have been able to find on the coach. Nothing in the left lower panel or behind the instrument cluster that I have been able to find. This happened to me on a trip a couple years ago but then after a stop the light was out.  First trip in 2024 it was on and has never changed even after the new switch.   Thanks for the responses. 

[Frank McElroy]

35 minutes ago, rustykramermetalfab said:

I have replaced the switch shown (Old switch actually tested fine) and the P light still will not go out. I had posted this previously also but wanted to make sure you all knew that.  These are the only Nason air PSI switches Shown in the photo that I have been able to find on the coach. Nothing in the left lower panel or behind the instrument cluster that I have been able to find. This happened to me on a trip a couple years ago but then after a stop the light was out.  First trip in 2024 it was on and has never changed even after the new switch.   Thanks for the responses. 

I can't find a specific schematic but the circuit is supposed to go from the dash indicator light display through the pressure switch to ground.  If you look at the connector schematics, the connection M60 has the parking brake on it.  It also references connector J5 pin 15 or 16.  Connector M60 should be accessible through the dash top panel behind the gauges.  Connector J5 is in the FRB.  I see on that schematic that pin 15 is empty and pin 16 says water in fuel.  On the 2008 schematic set, J5 isn't mentioned.  So there is an inconsistency in the 2006 set of wiring diagrams.

So, find connector M60 and see if you measure ground when the parking brake is released.

[rustykramermetalfab]

OK thanks Frank, Just to make sure I understand.  If I have a multi meter connected to a ground point and the other connected to the pin labeled J5 on the right middle port It should show ground when Brake plunger is Pressed to release brakes?  

[Frank McElroy]

Correct.  Unplug the connector.  If you ground the pin going to the gauge cluster, the Park light will go out.  On the other end of the connector for the park light to go out you must see ground.  If you don't get ground, see if on your coach connector J5 is used.  Those FRB multi pin round connectors are notorious for poor connections due to pin corrosion.

[rustykramermetalfab]

Will do Frank Thanks! I will start working on it tonight and post what I can find.

Thank you

Edited Saturday at 03:44 AM by rustykramermetalfab

[rustykramermetalfab]

I do have the J5 round connector in the FRB.  I found the 60 and unplugged it, when I do all the warning cluster is out. so the park brake light is out when the 60 connector is unplugged. 

[Frank McElroy]

21 minutes ago, rustykramermetalfab said:

I do have the J5 round connector in the FRB.  I found the 60 and unplugged it, when I do all the warning cluster is out. so the park brake light is out when the 60 connector is unplugged. 

Actually it doesn't necessarily mean that the park light ground passes through the J5 connector.  Disconnecting that J5 connector removed the Ignition signal so none of the lights would light.  Did you find a ground on the M60 connection?  Do you have ground through the pressure switch with the parking brake is released?

[rustykramermetalfab]

Frank I actually only disconnected the #60 plug in the dash. I did not check for a ground I was trying to follow your instructions to unplug the 60 and then ground the pin to the dash on the 60 to make the P light go out. I am misunderstanding, I guess. I will see If I can find a ground on that #60 in the dash.