Loss of audio. Radio cycles on and off

[Nipperchipper]

2019 ranger lariat. This has occurred 4 times with the truck. It has the b&o audio system. Seems random. Start the vehicle there is no sound on any source. The display shows that audio is off the it will turn on display input then goes back to audio off. Dealer changed the amp the first time it occurred. Second time they said the plugs on amplifier not seated properly so they added dielectric for better contact and secured the plug. Third time they unplugged and replugged amp fourth time same thing. Anyone experiencing this or a good guess because dealer has no idea.

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[Chab921]

2019 ranger lariat. This has occurred 4 times with the truck. It has the b&o audio system. Seems random. Start the vehicle there is no sound on any source. The display shows that audio is off the it will turn on display input then goes back to audio off. Dealer changed the amp the first time it occurred. Second time they said the plugs on amplifier not seated properly so they added dielectric for better contact and secured the plug. Third time they unplugged and replugged amp fourth time same thing. Anyone experiencing this or a good guess because dealer has no idea.

Did you ever get an answer for any of this? I have the exact same thing that happened to mine. Working perfectly one day, the next morning it cycles through audio off, then on, shows preset bank and no volume at all under any source.

 

[Chab921]

Did you ever get an answer for any of this? I have the exact same thing that happened to mine. Working perfectly one day, the next morning it cycles through audio off, then on, shows preset bank and no volume at all under any source.

2019 ranger lariat. This has occurred 4 times with the truck. It has the b&o audio system. Seems random. Start the vehicle there is no sound on any source. The display shows that audio is off the it will turn on display input then goes back to audio off. Dealer changed the amp the first time it occurred. Second time they said the plugs on amplifier not seated properly so they added dielectric for better contact and secured the plug. Third time they unplugged and replugged amp fourth time same thing. Anyone experiencing this or a good guess because dealer has no idea.

Anyone? Bueller? Bueller?

 

[Trustable]

My father had a similar situation with his leased mkx a few years back, it was in and out of the shop for a couple months, they had it completely stripped the interior out to try and find out. He also had static that would play. No matter what they did the issue always returned, ended up buying the lease back. Good luck, hope its nothing serious.

 

[Chab921]

My father had a similar situation with his leased mkx a few years back, it was in and out of the shop for a couple months, they had it completely stripped the interior out to try and find out. He also had static that would play. No matter what they did the issue always returned, ended up buying the lease back. Good luck, hope its nothing serious.

My father had a similar situation with his leased mkx a few years back, it was in and out of the shop for a couple months, they had it completely stripped the interior out to try and find out. He also had static that would play. No matter what they did the issue always returned, ended up buying the lease back. Good luck, hope its nothing serious.

I purchased a 2019 Ranger Lariat from a Ford dealership, Pre-certified, blah, blah. It was a lease turn in with only 36,000 miles. Has ALL the bells and whistles. Personally, one of the BIG features of me buying a vehicle is the audio system. This B&O system is incredible for a factory system!! I've only owned it 2 weeks. Everything was perfect. Parked it one night, then the next morning, it cycled through "Audio Off, Preset Bank, showing the source, then Audio Off"....... Out of the blue. I'm hoping they have found a permanent fix for this "bug". Here's to hoping!!

 

[Trustable]

I purchased a 2019 Ranger Lariat from a Ford dealership, Pre-certified, blah, blah. It was a lease turn in with only 36,000 miles. Has ALL the bells and whistles. Personally, one of the BIG features of me buying a vehicle is the audio system. This B&O system is incredible for a factory system!! I've only owned it 2 weeks. Everything was perfect. Parked it one night, then the next morning, it cycled through "Audio Off, Preset Bank, showing the source, then Audio Off"....... Out of the blue. I'm hoping they have found a permanent fix for this "bug". Here's to hoping!!

Yeah hope so too, especially since that mkx was a 2017 or 18 model year. It sounded nice when it worked, but im no audiophile, so I cant comment on the quality to much. For vehicles, as long as there is four speakers its good enough for me lol

 

[TomS]

Anyone? Bueller? Bueller?

I have had my 2019 Ranger Lariet from day one. Now my Audio in all modes is doing this as well. No sound and it cycles from AUDIO ON to AUDIO OFF! .
Going to dealer tonight!

 

[JACKSMYDOG]

I had it happen once, over a year ago, when I used the remote start until it turned off, then used the remote start until it turned off again, without getting in and fully starting it with the key fob. I disconnected the battery for 20 minutes and it worked fine after that.

I read somewhere (B4 I was on R5G) others have had similar issues after using the remote start multiple times without fully starting it, so I avoid doing that and it hasn't happened since. It may be connected or it may have been a one time thing for my truck?

 

[HeWhoWalksBeside]

Just got mine back from the dealer last week with this issue ('22 lariat). I was told there was an internal failure with the amp, which they replaced.

 

[TropR]

Hello,

Felt was better to keep the info in one place in case someone has same issue

I am having the exact same issue with my 2019 Lariat with the B&O system. Was working well until one day that I left it at the detailer. Did not use the radio until 2 days later so not sure when exactly happened.

I checked the fuse box and Both 20A fuses to the AMP are blown. Tried replacing one with the car off first and immediately started to spark.

ACM Trouble codes from FORScan B150C:87-0A, U0238:00-0A

Any help would be greatly appreciated.

 

[airline tech]

Hello,

Felt was better to keep the info in one place in case someone has same issue

I am having the exact same issue with my 2019 Lariat with the B&O system. Was working well until one day that I left it at the detailer. Did not use the radio until 2 days later so not sure when exactly happened.

I checked the fuse box and Both 20A fuses to the AMP are blown. Tried replacing one with the car off first and immediately started to spark.

ACM Trouble codes from FORScan B150C:87-0A, U0238:00-0A

Any help would be greatly appreciated.

To confirm: You have 2 fuses blown at the BCM:
Fuse 5 and Fuse 28

1. Why was it at the dealer? What did they do to it?

The codes you have are for the DSP (Amp) not having power

The DSP (Amp) appears fried (shorted) or the power feed to it is shorted.

Its splits power at the amp to the left / right - direct power feed from those fuses
It also has a remote turn on - power feed from the ACM

It also has a (audio bus cable) from the ACM feeding the DSP (Amp), this is the audio feed to the amp so that it can be amplified.
Being that both fuses are blown this cable may also be shorted (possible)

I would check the connections on the DSP (Amp) behind the rear seat for security or damage, possible mice damage and smell the amp to see if it you can detect (burnt electrical) smell

Other than that, this needs a thorough wiring check to confirm integrity, between the Amp and the BCM and ACM to prevent further damage to the wiring or possible truck fire, something is not right when you put a fuse in and have sparks, there is a short in the system be it wiring or the amp itself.
Be very careful on what you do, I have a way to isolate the Amp, but if the wiring is bad, it could possibly cause further damage or fire.

 

[TropR]

Hello

Thank you for the reply

Went out at home yesterday, so could not do much. Let me try to answer first:

Yes, fuses 5 and 28 are out

I took the car for a wash (detail). It needs to go to the dealer soon to figure out the transmission jerkiness, but that’s another subject.

I have the same question regarding the ACM versus DSP (Amp). I read in the service manual the ACM powers the front center speaker and tweeters and the amp powers the rest. I also don’t know if the amp can cause the erratic on/off behavior. On the other hand, I don’t know if the system just went into a self protect mode.

Here is an exact printout for FORSCAN:
===APIM DTC U0238:00-0B===

Code: U0238 - Lost Communication With Digital Audio Control Module D

Status (-0B):

- DTC Present at Time of Request

- Malfunction Indicator Lamp is Off for this DTC

Module: Accessory Protocol Interface Module
===END APIM DTC U0238:00-0B===

===ACM DTC U0238:00-0A===
Code: U0238 - Lost Communication With Digital Audio Control Module D

Status (-0A):

- DTC Present at Time of Request

- Malfunction Indicator Lamp is Off for this DTC

Module: Audio Control Module
===END ACM DTC U0238:00-0A===

===ACM DTC B150C:87-0A===
Code: B150C - Automobile Audio Bus (A2B) Node 1

Additional Fault Symptom 87):

- Missing Message

Status (-0A):

- DTC Present at Time of Request

- Malfunction Indicator Lamp is Off for this DTC

Module: Audio Control Module
===END ACM DTC B150C:87-0A===

These DTCs point towards Pinpoint test D in the FSM, but I do not have access to those, maybe someone here has it?

In the meantime, I disconnected the Amp including the A2B cable just in case. No burnt smell or loose connections.

Hope this extra info helps; will get to it tonight when back from work.
thanks!

 

[airline tech]

Again, the codes you have are tied to the Communication Loss from the DSP and the A2B Cable.
Pinpoint Test D - relates to the communication loss and not blown fuses, it does touch on the A2B cable, and the DSP enable, checking for power

You need to focus on the reason for the blown fuses.
Any speaker or wiring is possible (Amp to Speaker)
Fused Power from BCM to the DSP
Amp enable wire from ACM to the DSP

To isolate this, please use caution as a short circuit with blown fuses is not entirely safe (More damage to wiring or fire)

With Connectors disconnected at the DSP
Truck off and Turn Sync OFF - With the door open, the Wake Circuit will power the Sync screen.

Replace the (2) fuses - Do they remain Normal? (Not Blown)
If No - Stop and investigate power feed wiring from the BCM to the DSP
If yes - Connect the DSP Connector - C3041C (8 Pin Connector)
This is the Power and Ground and also the Amp Enable (Turn-On) Power

Turn Ign to (Accessory) and Turn on Sync. - Check the Fuses
If fuse blows, suspect bad DSP (Amp) or bad Amp Turn On Circuit wiring

If Good
Turn Off the Truck and Sync (Audio Off)
Connect the (A2B) Cable C3041D (5 Pin Connector)
The is the Audio (Input) cable from the ACM

Turn Ign to (Accessory) and Turn on Sync. - Check the Fuses
If fuse blows - suspect bad (A2B) cable or bad ACM output circuit

If Good
Turn Off the Truck and Sync (Audio Off)
Connect Connector C3041A (20-Pin) Connector
This is the speaker output cable and Can Bus Com
Turn Ign to (Accessory) and Turn on Sync. - Check the Fuses
If fuse blows, then all speakers and wiring needs checked to locate the short

We need to isolate which harness cable run is blowing the fuses and then dig deeper into troubleshooting the cause from that point.
If you follow this (step by step) one at a time adding the sources, you can at least get a direction to follow to isolate the source of blowing the fuses.

Provide a follow up post, on when the fuses blow (at what point)

So, the truck was at the dealer, and they did not touch it? Mechanically
You had the truck detailed (cleaned) only?

Just trying to pinpoint down possible location (open up) for other maintenance, mainly any cabin panels removed and reinstalled (pinching the wire harness to ground - shorting)
Cleaning sprays, vacuum nozzle bump on harness etc.

The wiring diagram shows 2 fuses powering the Amp - however it is unclear how the power is split from the fuses; I am assuming left / right or the Sub is fused separately from the speaker outputs. it lacks that deep detailed information.

 

[TropR]

Hello,

Thank you for the detailed instructions.

The fuses blew as soon as soon as I plugged in the 8 pin harness with everything off (sync screen and cluster were off) and doors open. They did not blew when I put them back in with the Amp disconnected. Then we should be suspecting the amp I assume?

The car has not been to the dealer at any point during this episode. I am actually taking it today for transmission service, because I am about to lose the 5-year warranty.

Going to ask them about the amp and see what they say. They did warn me about the car being in the shop for a few weeks because they only have one transmission guy might take a little time before I can give an update.

Thank you for the help so far!

 

[TropR]

Hello everyone,

so I just picked up the car from the dealer. The manager told me it needed a pretty extensive transmission rebuild. Drives smoother now.

Regarding the audio: they told me it was the amplifier. It was $660 plus labor to fix and I was not in love with the music in the first place, so going the DIY route.

I’m still torn which way to go. I have a Dayton audio. 408 DSP I was saving for a project, this might be the time.

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