Jeepinpete
NAXJA Forum User
- Location
- Northampton, UK
I have just fitted an alpine head unit to my 99 XJ and the factory changer would not work, it just whirred and clicked.
After some serious investigation and internet searching it is clear that no one actually knows the difference between alpine CHM-xxx changers and mopar cd changers so here goes.
The cd changer from Mopar as fitted to my 99 XJ which seems pretty standard has the Data Bus pin 1 and Data Bus ground pin3 reversed. Swapping these pins over immediately brought it back to life.
None of the other signals are swapped, the lead between the head unit and the cd player is a one for one, there are no crossovers etc.
So if you want to use an alpine head unit with the mopar changer or a mopar head unit with an alpine CHM-xxx changer you will have to swap pins 1 & 3 either in the lead or the changer, depending on how confident you are.
This does not apply to Alpine changers that use the Ai-net interface, it only applies to M-bus changers.
Hope this helps because it would have helped me!!
Pete
After some serious investigation and internet searching it is clear that no one actually knows the difference between alpine CHM-xxx changers and mopar cd changers so here goes.
The cd changer from Mopar as fitted to my 99 XJ which seems pretty standard has the Data Bus pin 1 and Data Bus ground pin3 reversed. Swapping these pins over immediately brought it back to life.
None of the other signals are swapped, the lead between the head unit and the cd player is a one for one, there are no crossovers etc.
So if you want to use an alpine head unit with the mopar changer or a mopar head unit with an alpine CHM-xxx changer you will have to swap pins 1 & 3 either in the lead or the changer, depending on how confident you are.
This does not apply to Alpine changers that use the Ai-net interface, it only applies to M-bus changers.
Hope this helps because it would have helped me!!
Pete