Audio Issue After Carwash

[ClevelandBeemer]

It’s very cold here in Cleveland sitting at about 13°F. I got a wash at a local touchless carwash, parked my car at home, then got my laptop to program the glare free headlights. When I got back in my truck, 30 minutes later, I have this constant pulsing/popping sound coming from my right rear door speaker. It’s like an excursion test being played at 200+ BPM (see video).

I do have an aftermarket sub, but it’s all plug and play through a harness. It’s also been installed for months without issue. This is really odd as this has never happened before but this is also my first winter with the truck.

The problem goes away if I unplug the factory B&O amp. However if the B&O amp is plugged in, then the problem continues regardless if my aftermarket sub amp has power or not. Also I can hear the pulsing happening from outside the car when I get close enough for it to detect my key. Once the key is detected it’ll pulse for a few seconds the go away. Then it won’t start again until I power up the truck. When resetting the Sync system, the pulsing continues without stopping.

The fact that this happened within an hour of getting a carwash makes me think this is ICE/Water related. Perhaps something with the DC to DC inverter.

Any ideas of the cause?

Video of the issue

UPDATE: I don’t know why I didn’t think of the 12v as I should have. I unplugged the negative terminal for ~20 minutes, reconnected, and at least for the moment the problem has gone away.

UPDATE 2: Unfortunately the issue returned, this time for only 2 or 3 seconds at a time, sporadically for a 10 to 15 minute period. Then went away entirely for the remainder of the 3 hour drive. So odd….

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[chriserx]

Never encountered anything like it before, the video was obviously trimmed, questions:

1) Order of events, when does/did it start i.e. door open, truck start, did you try acc mode, when did it cut off, i.e. on truck off, did it wait for door to open
2) There was a pause, what do you think was happening or did you cover the mic.

I know I had 2 more questions but they escaped me for the time being. Considering a 12v reset fixed it for the time being, what are the odds your 12v was loose even a little. Glad it worked cuz that'd be annoying af.

Edit: I missed it originally, so it starts on approach with truck off right?

 

[ClevelandBeemer]

Never encountered anything like it before, the video was obviously trimmed, questions:

1) Order of events, when does/did it start i.e. door open, truck start, did you try acc mode, when did it cut off, i.e. on truck off, did it wait for door to open
2) There was a pause, what do you think was happening or did you cover the mic.

I know I had 2 more questions but they escaped me for the time being. Considering a 12v reset fixed it for the time being, what are the odds your 12v was loose even a little. Glad it worked cuz that'd be annoying af.

Edit: I missed it originally, so it starts on approach with truck off right?

Yep, would momentarily happen when approaching the truck and the key is detected. Then once I turn on the ignition the beating would be play continuous.

After disconnecting the 12v it initially went away, randomly would return for 2 to 3 seconds over a 15 minute period. After that 15 minute period the issue totally went away and didn’t return.

It’s super super weird……

 

[kstype]

The only consistent issues I experience after car washes are the parking sensors getting annoyed but that only lasts for one or two driving sessions presumably when the bulk of the water has departed.

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