Ticking noise

[djp30djp]

Hi everyone from the originator of the fuel flap bodge, long time no login, but I have a problem.
A ticking/clicking noise is comming through the speakers.
It starts as soon as the head unit powers up in both Aux & Ign positions at about 2 ticks per second and gets faster when the engine is stated but is not related to engine speed.
I don't think it is radio interferance as it is the same on CD.
Any ideas/help welcome.
djp (X reg 110 HDI ececutive estate)

[teamster1975]

Hmmm, I'm thinking earth leak somewhere...
Have you tried pulling out the head unit and reseating the connector? This has caused strange problems for me in the past.
Another thought; is the cabin fan running at the time?

[djp30djp]

Yes, tried taking head unit out & cleaning connections & yes it does it with everything else swtched off, even does the slow tick with key removed & just stereo on?

[teamster1975]

Sounds like the amp in the head unit is giving up the ghost in that case...

[djp30djp]

OK, what do you think repair or replace? If I get a second hand one would it need recoding?
Just had a thought. what if I swap head unit from my other identical car to see if the noise goes with it? Any probs with code issues?

[teamster1975]

That's a good point. Yours is a D9 isn't it? The radios are coded to the car so a replacement would need to be recoded by your friendly stealer.
Maybe worth trying a generic head unit to double check that the noise disappears before you shell out any money!