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Old 07-15-2021, 09:53 AM   #1
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Alarm at dash

I just had an beeping alarm start at my dash board. Just a constant beeping sound. No other indicator lights are going on to show what the problem is. Any thoughts?
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Old 07-15-2021, 09:58 AM   #2
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Ignition on or off? If on then check your reclining driver seat is fully retracted.
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Old 07-15-2021, 10:43 AM   #3
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The two beepers I have in my coach are low air pressure and jacks down. The jacks down alarm is usually because the fluid reservoir is low as it uses a float switch to determine if the jacks are up.

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Old 07-15-2021, 12:17 PM   #4
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Thanks. I will check reservoir on levelers. Lights are out indicating they are up, but I will check further. My driver seat is electric except for the back rest which is manual.
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Old 07-15-2021, 03:02 PM   #5
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I also just noticed that all my gauges shut off,( pointers return to 0 or far left) intermittently. When this happens, motor is running. Even tach is at zero. If I tap the dash, they all come on. Maybe a loose ground or short?
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Old 07-15-2021, 04:27 PM   #6
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Quote:
Originally Posted by Pez Vela View Post
I also just noticed that all my gauges shut off,( pointers return to 0 or far left) intermittently. When this happens, motor is running. Even tach is at zero. If I tap the dash, they all come on. Maybe a loose ground or short?
I think this last post gives us something to work with.


Yes, I agree it may be a loose wire or ground or, more directly, a problem with the module that sends the data to the gauges. This is not the ECU, but a "translator" module (someone will post the correct term) that allows the gauges to read the information. The alarm is probably in response to one or more of the gauges reading a low or dangerous value.


Wait for someone familiar with Freightliner chime in about how the gauges are fed information, but this sounds like your problem.


Just to illustrate, I had a one-time similar incident in my coach. Alarm screamed and nearly all gauges went to zero though the coach ran and drove fine. Shut down, waited a minute, restarted, and all has been fine since. Found the module in the rear of the coach, worked the connectors a bit, and all seems to be fine.
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Old 07-15-2021, 07:24 PM   #7
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Thanks for the info. I will do some further investigation.
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Old 07-16-2021, 02:24 PM   #8
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I posted a testing document to your question about gauges . Some of the info you need maybe in that document .

Our Freightliner chassis use separate sensors for the park brake warning ; light and buzzer ; you didn't mention exactly when the buzzing starts , so if the buzzing is only when the engine is running and shifting into gear , then one of the sensors is bad .
The two are a redundant feature , if you have buzzer , but no light , bad sensor . Light but no buzzer , bad sensor ; both light and buzzer , problems with the park brake release .

Grid 2 D in this diagram of our air system.
Attached Files
File Type: pdf Freightliner air system diagram 1999.pdf (312.3 KB, 11 views)
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Old 07-16-2021, 11:08 PM   #9
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Coming home today we experienced a quick dash outage and alarm, lasting only a second or two. A white screen box came up but was such a short duration I could not read what was said. By the time I noticed something amiss the dash gauges came back on. Never experienced this before. Did not repeat the rest of the way home. Any ideas ?
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Old 07-16-2021, 11:17 PM   #10
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Coming home today we experienced a quick dash outage and alarm, lasting only a second or two. A white screen box came up but was such a short duration I could not read what was said. By the time I noticed something amiss the dash gauges came back on. Never experienced this before. Did not repeat the rest of the way home. Any ideas ?
Freightliner has used three different gauge packages ( that I know about ) between 1999 and 2007 the system they started using in 2007 MIGHT be the one still in use so , I don't know if this info will cover your chassis .
If it doesn't appear to cover your dash a call to Freightliner is in order , have your serial number handy . 1-800-385-4357
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File Type: pdf LBCU info and diagnostics.pdf (220.3 KB, 14 views)
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Old 07-17-2021, 08:26 AM   #11
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Quote:
Originally Posted by Skip426 View Post
I posted a testing document to your question about gauges . Some of the info you need maybe in that document .



Our Freightliner chassis use separate sensors for the park brake warning ; light and buzzer ; you didn't mention exactly when the buzzing starts , so if the buzzing is only when the engine is running and shifting into gear , then one of the sensors is bad .

The two are a redundant feature , if you have buzzer , but no light , bad sensor . Light but no buzzer , bad sensor ; both light and buzzer , problems with the park brake release .



Grid 2 D in this diagram of our air system.
I have narrowed the alarm beep to the parking brake. When RV is running, parking brake on, in gear, alarm beeps and brake light is on. I assume this is to tell you brake is on.
When I release parking brake (air by the way), RV in gear, parking brake light goes out but beep continues. Sounds like a bad parking brake sensor. I am having difficulty reading the schematic to locate where the sensor is located so I can get information to order a new one. Any ideas?
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Old 07-17-2021, 08:52 AM   #12
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Quote:
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I have narrowed the alarm beep to the parking brake. When RV is running, parking brake on, in gear, alarm beeps and brake light is on. I assume this is to tell you brake is on.
When I release parking brake (air by the way), RV in gear, parking brake light goes out but beep continues. Sounds like a bad parking brake sensor. I am having difficulty reading the schematic to locate where the sensor is located so I can get information to order a new one. Any ideas?
I would still be concerned with the symptoms you mentioned in post #5. The gauge issue may be related to the cause for the parking brake warning--or not.


It's not really clear if your gauges still fail to register when this alarm is sounding.
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Old 07-17-2021, 08:59 AM   #13
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I would still be concerned with the symptoms you mentioned in post #5. The gauge issue may be related to the cause for the parking brake warning--or not.


It's not really clear if your gauges still fail to register when this alarm is sounding.
The gauges appear to wiring fine now, with the exception of the engine temp gauge. I the wires from the engine temp gauge and plugged them into my air pressure guage. It moved the needle. I also checked for power at the end that plugs into my engine temp gauge. 7 volts as it should. I am pretty sure the guage is broken. The alarm is tagged as parking brake chime. Pic to follow.
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Old 07-17-2021, 09:01 AM   #14
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