Hi y'all. At the risk of going over old ground with this topic...

Some months ago the bluetooth connection went tits up and point blank refused to connect to my then current iPhone 5s although up to that point it had been working ok. It seemed to "see" the phone and got as far as asking for the 16 digit code to pair, but then would either hang or else display the error message "Compatible phone not found". At other times it just wouldn't acknowledge the phone at all. I've since upgraded the phone to an iPhone 8 Plus and get exactly the same symptoms. Pretty sure it's not the phone as it connects quite happily to my daughter's 20 reg Kodiak, also a 20 reg Mini. The original BT unit is a 5N0 035 730D but I've managed to find a much more recent 3C8 035 730E unit for a pretty decent price, so I intend fitting that in place of the older one. A full diagnostic scan carried out recently when I had coil pack problems ( 2 went faulty within two weeks of each other following a plug change at the service in Feb '21) indicated the GSM aerial was open circuit so I replaced the built in one with an after-market one just plugged into the port on the BT unit. Didn't make any difference though on a re-scan, still threw up "Address 77... GSM aerial open circuit".

To cut a long story short  I'm assuming the replacement BT unit will need recoding, so if anyone could come up with the appropriate codes please or point me in the direction where I might find them I'd be very grateful. As previously said, the new BT unit is a 3C8 035 730E, the head unit a factory fitted Bolero and the mobile an iPhone 8 Plus. Many thanks, any info gratefully received.

 

bicycle_repair_bloke

11 reg Octy 2 1.8 TSI, CDAA, 54k miles. 

Generally the BT modules are plug and play if the car already had one fitted. The gateway list already has a phone module in its installed list, so no need to mess with that.  The new unit you have supports wi-fi by default, so I'd assume its switched on, but if the car can't take advantage of it, I'd turn it off in the long coding to reduce the chance of irrelevant dtc's being generated by it looking to use something it can't. 

GSM aerial is direct from the BT module to the roof aerial with one connection at the aerial base. So there's 2 possibilities for your dtc, a faulty roof aerial/wiring or internal module fault.
Only thing is I'm not sure if the system will "accept" a non genuine aerial without a dtc being generated.

Silly suggestion: I assume you've tried clearing the code? as they don't self-clear.

Edited 14 May, 20215 yr by daz1986

Hi daz, thanks for that. I haven't tried the new module yet but will do fairly soon. The thinking on the wi-fi facility was that any occasional passengers might be able to use it without  their device being paired to the BT module. Could be totally incorrect of course!

I'm erring on the side of thinking that it's an internal module fault as this morning when I went out it just came up with "Initialising Chris's iPhone" and wouldn't do anything else, not even able to cancel that.

Not a silly suggestion at all. I haven't got the necessary hardware to clear the fault code so I'll have to go see my friendly garage man, get him to do it and then see what happens from there.

Many thanks for your advice.