Rear Brake Assist Unavailable

[Bryan Simon]

I was playing with ForScan this weekend.
Changed battery SoC, disable ASS.
Before starting anything, and I mean before plugging the adaptor int the pc, on my way for my morning coffee, I got the “rear brake assist unavailable“ message.

While playing with ForScan, I looked for DTCs stored or active and there were none.

Anyone got an idea why this thing quit working? I hate the message in the IC and even if I shut it off in settings, a different message appears. Not that I ever depend on this as I don’t think it has activated more than 5 times since I’ve had the truck, and that was due to a rather quick approach to an obstacle I was fully aware of.

might this be a center stack reset, or is it deeper.
(never off pavement except for my yard, nothing wiring related fiddled with at all, did lower the rear over a year ago.)

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[Sparkybrent]

I was playing with ForScan this weekend.
Changed battery SoC, disable ASS.
Before starting anything, and I mean before plugging the adaptor int the pc, on my way for my morning coffee, I got the “rear brake assist unavailable“ message.

While playing with ForScan, I looked for DTCs stored or active and there were none.

Anyone got an idea why this thing quit working? I hate the message in the IC and even if I shut it off in settings, a different message appears. Not that I ever depend on this as I don’t think it has activated more than 5 times since I’ve had the truck, and that was due to a rather quick approach to an obstacle I was fully aware of.

might this be a center stack reset, or is it deeper.
(never off pavement except for my yard, nothing wiring related fiddled with at all, did lower the rear over a year ago.)

I get this same message, but I have a construction shell with the camera at the top and no tailgate. I'm guessing you may have an alignment issue, but I have no idea how you might be able to adjust it.

 

[David1234]

I get this same warning message off and on periodically, so I'd be extremely grateful to anyone who can tell me what causes it and how to fix the issue.

 

[Double-A]

I've had it a couple times before and figured out what was causing it in my situation: I turned the parking sensor alarms off when I was going through a carwash, as my truck has the 360 camera package and it always pops up thinking I'm being crashed into from all angles, but then I drive home and reverse into a parking space and that same message pops up, and I figure out that it'll go away if i press that same toggle to turn it back on when the revers camera is up.

 

[Bryan Simon]

I get this same message, but I have a construction shell with the camera at the top and no tailgate. I'm guessing you may have an alignment issue, but I have no idea how you might be able to adjust it.

Just saw your avatar.
I have the same truck in blue.
lowered rear, and 4x4 decals gone

 

[Bryan Simon]

I’m now wondering if the battery was low.
did some exploring over the weekend so the key was in run position a long time. I usually drive the ElCamino on my days off, or the old k1500.
So 5 days I took off last week, the truck never left the driveway.
At any rate, brake assist message did not show up today.

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