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Old 04-13-2013, 01:56 PM   #1
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fleetwood discovery 37v low air alarm

just pick up a 2000 discovery 37v. Driving down the alarm goes off for a bit then stops. Have air. Has anyone else had this issue? If you did what is the fix.
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Old 04-13-2013, 06:54 PM   #2
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By saying " have air " do you mean you have more than 85 PSI showing on both gauges ?
While driving down the highway you should mantain 100 to 120 psi.
After repeat brake applications you may drop to below 100, if the pressure drops below 65 psi you get the low air alarm , about 50 psi your spring ( parking ) brakes come on and you come to a stop until you get 100 psi again.
If you have over 100 psi and the alarm goes off you have a sensor problem.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
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Old 04-13-2013, 08:35 PM   #3
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Rt rear storage bay 2d from rear you will find three modules. The most fwd one should be your guage module (?) name? You will find two small air lines to it. Tap with a screwdriver handle with the engine running and see if the light comes on. The light may only flash for an instant so a helper might be good. Try wiggling the connectors also. These modules have been known for bad solder joints and sadly, no repairers as the circuit board is potted.
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Old 04-13-2013, 09:03 PM   #4
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This may be a stupid answer to your question but have you made sure to flip your dump air switch back to closed? My coach is in storage or I would know what the actual position is called. To the left is dump to the right is closed but I know that is not the proper labeling.
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Old 04-14-2013, 02:00 PM   #5
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I have a 2000 37V with a similar problem. From the research I've done, it is likely caused by bad solder connections in the VDC. Take a look at this thread for instructions on how to check and repair the VDC. I have the instructions myself but haven't gotten around to making the repair yet.

Hope this helps.
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Old 04-14-2013, 02:27 PM   #6
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are you sure its the low air alarm? the alarm that frequently goes off on many Discoverys while driving around corners or in cold weather, is the auto leveling system. If the leveling sys hydraulic fluid level isn't high enough or if the fluid is cold, it momentarily triggers the alarm when cornering.
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Old 04-15-2013, 07:28 PM   #7
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The issue was found in the vdu . Replace it everything is good . Will keep old one for spare after I try to fix it.
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