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Old 04-24-2017, 04:12 PM   #1
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How do I access the rear ABS sensors?

I have the constantly lit ABS warning light issue. I was able to clean the two front sensors. They were caked with about 1/4 inch of grease, grime, and dirt. Went to clean the rear sensors and I can't find them. The wire goes through a hole on the back of the inner wheel and then disappears between the wheels. Looks like no access unless the wheels come off. Is this the case?
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Old 04-24-2017, 05:54 PM   #2
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Yup, wheel has to come off.

Have you tried to retrieve you fault codes. My ABS system has a circuit board mounted in the front drivers side compartment, lower left side. There is a small black button and with a LED next to it. To retrieve the codes I have to

Turn the ignition on, do not start coach
Wait a short time and then press the brake pedal 1 time
Go out side and press the small black button on the board for ~1 second (if you press it too long it throws the ABS system into some sort of test mode and the ABS light will stay on all the time.
After a short time the LED light will blink. IF there are not faults the LED light will blink a code. If there are existing faults the LED light will blink 2 different numbers which will provide you the problem with your ABS system.

If you don't have a Bendix ABS manual/trouble shooting guide do a search for your model. Lots of info out there on these systems.
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Old 04-24-2017, 06:45 PM   #3
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Hi Jim. Well, there is a problem with the circuit board. The test button does not work. I took the button apart and it looks like the previous owner did the same thing and it is missing parts like a contact pad and a spring, so it is in-op. I tried putting a small screwdriver on the contacts to simulate a closed circuit and the red led stays lit. The dash light and the red led on the ABS remote board stay on all the time. I even tried the power down trick to no avail. They want $50 for a used board, but I don't think that is the problem and I don't want to spend $50 to replace a $.59 switch.

I drove the coach a few miles to see if cleaning the front sensors would clear the error but it didn't.

I saw another post where folks were power washing in and around the rear wheels to clean the sensor, but that seems like a shot in the dark.

I don't have heavy duty jacks and stands, so looks like I might have to pay some labor to have this repaired.
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Old 04-24-2017, 07:30 PM   #4
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If the switch on the board is bad it may be your problem. In the past I would have to clean mine periodically by taking the board out and using compressed air to clean the button, blowing air and rapidly pushing the button to free it up.

If you are brave you might try replacing the button, which I think is a momentary type button. Although $50 for a used board seems extreme it may be the lesser of 2 evils.

I accidentally put my ABS system into a bypass mode by holding the button too long. The ABS light stayed on all the time. Read the manual and figured out what the problem was and how to fix it. Guess what, you need to use the button to fix this problem.
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Old 04-25-2017, 11:02 AM   #5
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Quote:
Originally Posted by jacwjames View Post
If you are brave you might try replacing the button, which I think is a momentary type button.
I am actually thinking about doing just that, but a schematic on the board has been hard to come by. Actually, any documentation on the ABS or that board has been very elusive on Google. You are really good at rat-holing docs, do you still have any documentation on it? LOL.
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Old 04-25-2017, 06:01 PM   #6
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Ok, the plot thickens. I pulled the ABS computer completely out of the equation and the red ABS light on the dash and the red led on the remote circuit board is still lit. Suspicious of the remote board now.
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Old 04-30-2017, 03:53 PM   #7
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UPDATE: I purchased the used remote ABS board from Visone and installed it. ABS dash light is out, and the system is reporting everything ok! I did a panic brake test stop and the ABS in now working again.The $50 gamble paid off. I purchased this rig 3 years ago and the ABS light was always on. I was told by the previous owners that the ABS computer was dead and they actually discounted the rig another grand because of it. I guess they got a bad diagnosis.
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Old 04-30-2017, 06:26 PM   #8
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Glad this worked out for you, troubleshooting this system can be very complicated to say the least. Seems like you got lucky.

I've had problem with my system periodically over the last ~9 years. I do have a number of documents in my data base. Probably the best though is the original that came with the rig, this is the one I found about the default mode and figured out how to fix.

Besides cleaning the button occasionally I added a good ground to the system.
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