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ABS and ATC dash lights on

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Don White:
Happy Monday!

I took my coach out on Friday to exercise it after sitting for a couple months.  As I was returning to the campground both the ABS and ATC dash lights came on.  When they came on I was doing no more than 10 mph and applying the brakes to slow down for a tight curve to enter the campground I 'am staying at.  I let the coach sit over the weekend before starting it this morning.  Both lights came on and stay on.

Approximately 8 months ago while driving the coach I had to slow down rapidly to avoid a car that pulled out in front of me.  Both the ABS and ATC lights came on but went off after a few minutes.

I checked Coach Assist and didn't see any documentation on the ABS or ATC systems.

Does anyone know what these systems look like and their location?  I would like to at least give them a visual inspection before trying to find a shop to take the coach to.

Any other thoughts would be appreciated.

The coach is a 06 Marquis with a Roadmaster chassis.

Thanks.

Eric Maclean Co-Admin:
This thread may help shed some light on your issues

https://beaveramb.org/forum/index.php/topic,10793.msg73347.html#msg73347

I suggest checking / setting the sensor air gaps on all the wheels ( most commonly drove axle or tag axle out of adjustment)
Once the sensors have be taped back in the system should reset and the light will go out when the vehicle reaches a speed of 20 mph.


Eric

Scott Shearer:
Don,

We had an intermittent ABS/ATC light, the culprit turned out to be a dirty ABS test button. The ABS test button is under the removable dash cover next to the J1939 data port (see Section 9, page 277 in your owner’s manual). You could ‘feel’ that the test button was gritty when pressed, I cleaned it with tuner cleaner, no more ABS light issue.

-Scott

Don White:
I located the ABS switch underneath the removable dash panel.  There is also a black switch that is not identified in my owner's manual.  Any thoughts?

Scott Shearer:
The 2006 Marquis owner’s manual identifies the black rocker switch as an optional ‘ADC Test Switch’. I don’t see anywhere in the manual that explains what it is used for, it’s not referenced at all in the owner’s manual for our 2006 Patriot Thunder.

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