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[TheBoy]

Possibly one for that nice DTM fella....

I had her watching BBC One East all the way to mums on Saturday.  Once past Northampton, picture quality was OK-ish, but audio was constantly breaking up - initially we though headphones, so turned off dual view so I could hear it, and it was still breaking up.

FM - it's picking stuff up, but very few stations have and RDS info.

Given DAB is struggling to pick up much, does this point to the antenna amp?  If so, does it have a fuse?  I can't find the amp on the schematics I currently have downloaded (and not sorted my TOPix access back yet, LOL)

For reference, its the B&W 1200W system in mine with the gen2.1 HDD IAM/Touchscreen setup, if that makes a difference.

[Viral_Jim]

Assuming yours has the antenna in the window glass, I'd be tempted to look closely at these first of all.

I had similar problems with FM radio in my first Saab 9-5, turned out that  this was my issue. One quick insurance claim later for a busted window and all was well 

[Marks DTM Calib]

Will have a cat with the antenna team today, the usual cause is grounding issues rather than the amp (which is pretty bulletproof and either works, or doesn't work).

You can get straight into Topix using your other halves cdsid (or message me)

[TheBoy]

You can get straight into Topix using your other halves cdsid (or message me)

Yup, I can never remember the new password, LOL.

I did have a poke around in topix, but cant find anything on them, and very limited in the wiring diagrams.  But it did help locate the amps....

[TheBoy]

So there is an antenna amp on both C pillars.

NS:


And this is what I think is the power feed:



OS:


power:

[TheBoy]

Currently, on my driveway (which is always problematic), I can get most BBC and some independent like Great Hits Radio on DAB, and a handful of stations on TV.

If I unplug the power from OS antenna amp, it makes no difference to DAB or TV.

If I unplug the power from NS antenna amp, I lose all DAB, but makes no difference to TV

With both unplugged. I lose all DAB and makes no difference to TV


(I forgot to check FM whilst doing these tests)


In addition, my understanding of the wiring diagram (INFORMATION AND ENTERTAINMENT SYSTEM Part 1 for Mr DTM) is that the IAM provides power to the antenna amp(s) directly, presumably when turned on.

However, I was seeing 0V on that power pin* whether the system was on or off (but never tried with ignition on, maybe I should have? But the radio/tv should work with audio on, even if ignition is off?)

*I used a normal sewing pin pushed into the connector to attach a croc clip, and the 0V was from one of the the rear ciggy lighters.


Viral_Jim - screen elements look in tact, though due to number of antennas, and the fact its also HRW, I can't be absolutely certain about what is a design break and what could be damage, though all the breaks in the wire look clean cut and a similar 1mm ish gap

[TheBoy]

With regards to the NS antenna amp, not quite sure how it works with 2 wires from rear window, and 4 coax cables off to the various devices.