No joy for me
I've tested the cable and it definitely seems to be correct electrically speaking. I've checked each wire with a multimeter and there's continuity across all the cables, 300kΩ resistance between the left and right channel and the pins are all making good contact. I still don't get an AUX-In option on the radio though
I ended up buying some of the single pins from Maplins and using those to test, the ones in the photos below were too big to fit into the existing plug so I decided to bypass them and connect straight to the pins on the back of the radio - still no joy
For interest and reference, this is what the cable ended up looking like:
Close-up of the way the resistors are soldered into the cable, bridging the left and right channels.
All heat-shrinked and ready to go - fairly neat and tidy and easy enough to hide in the dash without fear of it falling apart. I decided to leave a plug on the end rather than a socket as I wanted to run this through the dash and out the right hand side above the instrument pod. The idea is to use this as a line-in socket from my iPhone TomTom car mount. That would mean I could opt to play music from the iPhone via the TomTom's line-out socket if I wanted to. It'll also let me stream music over the 3G connection, or even play TV shows on the iPhone and have the sound through the HiFi.
Anyway - I've not given up yet, I'll have to do a bit more pondering and have another go at this :\
Things I've left to try:
- Leaving the cable plugged in whilst the car is off and goes into deep sleep, then it'll do a cold boot and maybe it needs a cold boot to recognise a new AUX-IN socket?
- Re-do the cable from scratch, just in case it *is* a dodgy cable and my multimeter isn't showing it up for some reason :\
- Perhaps I should try and use something else with a line-out socket, rather than just testing with the iPhone/TomTom.
- Put the damn capacitors onto the cable, maybe they *are* there for a reason other than filtering after all...