Radio/speaker interference - Gransport

N

nigw

Member
Messages
904
I’ve got a whining radio interference that I’m struggling with on my 2007 Gransport. Steps so far:

1) It had an aftermarket DAB stereo fitted, but I’ve tried refitting the original Becker Cascade and it makes no difference.

2) The only electrics I’ve altered is replacing the rear parking sensors (OE Bosch), and unplugging the NavTrak. I’ve tried plugging the latter back in but it makes no difference.

3) The buzzing is unaffected by whether I’m in AM, FM, MW etc.

4) it’s worse with the engine running, and with my head in the pump it seems like it could be fuel pump related.

5) The only wiring I can see unplugged is this one - not sure what it’s for.

I noticed as part of the aftermarket install they’ve fitted a 10A noise suppression unit (found the same one on Amazon), but it doesn’t seem to do anything.

Any suggestions/tips would be appreciated!
 

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N

nigw

Member
Messages
904
Hmm, further investigation - the rear speakers are aftermarket, and if I unplug them the front speakers work without interference. Perhaps I just need to put standard speakers back in. It’s obviously had a reasonably pricey system put in, but an aftermarket amp from the boot has been removed by the previous owner....
 
Oneball

Oneball

Member
Messages
11,130
I had three issues causing problems with my 3200.

The aux power relay had been bodged but I doubt its that.

The other two. Were a faulty amp causing a battery drain. Have you got Auditorium? It’s easy to bypass on the 4200 as it’s plugged into the loom.

And the front speakers had broken down internally so there was no resistance between the coil and body.
 
N

nigw

Member
Messages
904
Yep I’ve got Auditorium. Do you think it’s worth bypassing, and if so - where is it? Cheers!
 
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