Solving MDAII carkit and XDAII carkit behaviour differences

[edsub]

On http://wiki.xda-developers.com/wiki/Connectors it is clearly explained that the MDAII connector has following audio-related pins:
1 CAR_MIC_IN
3 CAR_AUDIO_R
4 CAR_AUDIO_L

With the original T-Mobile MDAII carkit ALL audio (phone & pda) is said to go via these pins
With the XDA2 carkit only phone audio (after accepting a call) goes via these pins.

Maybe this has also something to do with the switching of the in-car signal on
19 CAR_ON

:idea: CAR_ON is connected to +6V on the car charger which makes the phone go to speaker mode immediately when picked up or dialing.
>> This is the behaviour of the XDAII carkit!!!
When this pin is connected to ground, the internal mike and speaker are turned off, and audio input is taken from the audio input pin on the connector.
>>Is this the behaviour of the MDAII carkit??

:?: So: Would it be worth trying to connect pin 19 to ground instead of +6v inside the carkit cradle??

[edsub]

Can't believe no-one with a XDA2 / Expansys carkit is looking forward to solving these issues too . . . :(

[damian.hunt]

I checked this a couple months ago when I dismantled my expansys car kit. I'm sure I found pin 19 is already grounded on the carkit. With regard to this part of the pin 19 description:

"...CAR_ON is connected to +6V on the car charger which makes the phone go to speaker mode immediately when picked up or dialing. "

"Speaker mode" in this case means the handsfree mode, where the integral xda II speaker is turned up to "distortingly loud" and the internal mike is used in call, similar to what happens if you push and hold the green/send button during a call. If pin 19 is raised to +6V, this will be the xda II's default behaviour with the phone function. This is so you could plug in a simple car charger that puts pin 19 at +6V and that provides only power to the unit (no mike, speaker etc) and allows you to make/receive calls through the builtin speaker and mike without having to hold the xda to your ear.

I feel that if pin 19 is grounded, all audio should be sent through the bottom connector and then into the car kit. Indeed, this is the case with some ROMS / software versions, but not in others. I therefore think it is a software/ROM issue.

I found with my uk o2 xda II, with both the launch ROM and 1.60.50 ROM I got the same behaviour - the unit did not send pda audio to the bottom connector whether pin 19 was grounded, raised to 6V or left floating. Yet other HTC Himalaya owners have reported things differently with different ROMS.

[edsub]

Firstly I thought this to be a s/w issue as well.
But then: The T-Mobile MDAII carkit seems to be working as desired no matter the rom version . . .

Could we get together a list of device/rom/carkit combinations with the actual behaviour in sorting this out?

ANYONE: pLEASE POST YOUR CONFIG HERE.

MINE:
Config: MDAII / 1.60.00WWE and 1.60.36 ext / XDAII Carkit (Expansys like)
Bahaviour: Only phone audio via carkit when in a call

[eayuwna]

I am having an identical problem

Build: 13252 - 1.60.00WWE EXT. 1.60.50

I have an XDA I've been messing about with in the car to try to make myself an in-car kit and that was all going fine (Although the phone is now stuck in in-car mode, think i've blown something up :-)). For the kit I made there, +6v on pin 19 output all audio to the connector.

I then bought an XDA II and in-car kit, wired it all in and then tried to play audio through an in-car cassette adapter lugged into the headphone socket that's built in to my in-car kit. The phone outputs to the speakers fine, but the audio, (Mp3 and the like) won't go to the conncetor at the bottom. (Note that the in-car kit's jack socket is driven off the 22 pin connector at the base of the XDA II)

I'm dissapointed that it could be a softwaer problem, although surely someone somewhere must know a way to force the software into in-car mode constantly and playing the audio out?

Any solutions then let me know cos I'm really irritated that I've just spent £150 on the in-car kit only to find that it don't work yet!

Roll on the XDA-Developers Special Ed. ROM for the XDA II, I bet that'll fix the problem!

Keep me posted on any updates,

Will

**********************
Just done some more reading on the forum and cam accross this

http://forum.xda-developers.com/viewtopic.php?t=8346&highlight=car+automobile+mode+xda+ii

not sure how easy it will be to change the dll files over, anyone with some experience in doing this fancy having a go first and letting me know how it gets on? Is it possible to do? What do I have to do once I mess up the ROM on the pda by overwriting a dll file? Can I just hard reset?