I would like some help please.

I have a 2008 c6 with factory NAV.
I have swapped out the XM unit for a Sirius Unit SirGM1
I have added the PAL unit

as you can se in the video here when switch ing from PAL back to XM1 the head unit freaks out and and goes DUH? for several moments.



im totaly stumped as to whats going on. thank you for any suggestons.

cheers
chad

 

It might help to diagnose what is causing the problem if you elaborate what came first. Did you install the Sirius before the PAL? Was the PAL installed first and work fine until the Siruis was installed?

Just trying to narrow down the possibilities by figuring out the sequence of events...

 

Good question C6Tim. the sirius was installed for a week with no issues. then came the PAL.

At random and only a few times (say about 3) Ill start the car and the XM1/XM2 button is completely gone (no sat or PAL).

Ill stop restart the car, and the button is back.

 

I meant to ask this question before as well... How is the PAL installed? Was it installed using the GM instructions or the "short cut" install connecting it directly to the satellite receiver?

 

Was the PAL dealer installed or self-installed?

If self-installed did you use the GM supplied cable AND disconnect the Class 2 signal to the XM/SirGM1 at the Splice Pack?

The PAL contains a relay that blocks all Class 2 commands to/from the XM/SirGM1 when in PAL mode. If you hear audio from the SirGM1 in PAL mode, it sounds like the SirGM1 is still seeing Class 2 traffic.

If you still have the XM, just remove the cable going to the SirGM1 and connect it to the old XM (reconnect the antenna to the XM). If everything works fine in this mode, then there may be a compatibility issue with the PAL and the SirGM1.

Keep us posted.

Save The Wave,
John

 

self installed

just did that.

At this moment I have the Old XM (no paid subscription but I do hear the preview sound) and the PAl connected.
The Class 2 wire is connected at the XM box (under the waterfall).

and the verdect....

works like a champ.
I can flip back back and forth from XM (XM1) to PAL (XM2) with out a hitch.
there is a 2 second pause from PAL to XM but I feel that is to be expected.

crap now there may be a Sirius compatibility issue.

Im going to evaluate the wiring harness of the SIRGm1 and see if I can get this fixed.
Im just happy the PAL is not smoked.

 

The SirGM1 was supplied with a harness? I would have thought it just plugged into the car harness that was previously connected to the XM.

Did you use Ray Kawal's cable for the PAL self-install?

Save The Wave,
John

 

The SIRGm1 does come with a basic connector. It "converts" the black KIROIGROIWA-BLA connector to a different style of connector. The wire count is the same.

I did not use the Kawal's cable (could never make contact with him *shrugs*).
For the PAL I used the Factory issued PAL harness. I removed the NAV head unit and conned the harness per instructions. The PAL is living on the passenger floorboard and the Ipod is in the Glovebox.

I snaked the Class 2 wire (Black w/yelow stripe) under the console to the waterfall location. Per directions I cliped the Lite blue wire from the Black connector 2 inches back and crimped from the connector to the PAL.



my gut is telling me that the SIRGm1 is not doing "something" that the XM normally does (delayed powering off, sending a signal down the audio bit, not sending a 'good bye' command down the wire..something).

..and that something is confusing the PAL and there by the NAV unit.

..hmm I wonder If I can go to a GM shop and use the Tech II to 'Lock in' the XM2 as a PAL only. I dont care If I loose the second set of 6 presets.

 

OK, the wiring sounds correct and I now understand why the SirGM1 was provided with a cable.

I have no knowledge about the operation of the SirGM1 and no detailed information about the internals of the PAL. What I do know is that the PAL contains a relay that is used to disable Class 2 communications to/from the XM/SirGM1.

This is how I "think" it works. The PAL is always monitoring the Class 2 interface. When it detects a selection for XM2, it energizes the relay to disable communications to/from the XM/SirGM1. It is also possible that the PAL generates a power down signal on the private Class 2 interface going to the XM/SirGM1. When the PAL detects any source selection other than XM2, it de-energizes the relay and allows Class 2 traffic to/from the XM/SirGM1.

I don't know if GM provides any specifications for the Class 2 command set to after market suppliers. If not, then these people must reverse engineer the Class 2 traffic in a functional automobile and do their best to clone the original operation with their custom device (SirGM1 in this case). If the PAL is doing something that the SirGM1 does not expect or understand, then strange things can happen. If this is the case, I doubt that GM would make any attempt to resolve the issue. It would be up to the designers of the SirGM1 to do that.

Try an experiment and let me know what happens. Select any source other than XM1 or XM2 and allow it to play. While playing, select XM2. This should start the PAL and the XM/SirGM1 should remain in "sleep" mode. After the iPod starts playing, select any source other than XM1 or XM2. The PAL should go to "sleep" mode and the other source should start, again the XM/SirGM1 should remain in "sleep" mode.

If all of this works as expected, then I am quite sure the problem resides in the SirGM1. I think that for some reason the SirGM1 is remaining active once selected, even after XM2 has been selected. The fact that replacing the SirGM1 with the original XM allows for normal operation also point the finger at the SirGM1.

Save The Wave,
John

 

Good Thinking, however to Jump from AM mode to PAL (aka:XM2) mode I will have to press XM1 button Twice. Thereby 'waking up' the Sir-Gm1 as I blow by it in an effort to get to the PAL mode.

What I did test, is using my Fluke Multi Meter I watched the Audio Line Level Outs from the Sir-GM1. I watched the values increase/decrease as music traveled across the Shielded wire. Whether the car was in XM1 or XM2(PAL) mode there was signal moving across the wire (I forgot to test for Audio Signal while in AM/FM mode).
So i think you are correct that the Sir-Gm1 never goes to 'sleep' and the PAL eventually cuts it off and ignores it. But the Sir-Gm1 is still putting out music. So when the PAL De-Energizes the 'ignore' relay the Sir-Gm1 is acting like a 3year old child screaming while on a sugar high and confuses the NAV head unit without a chance of it introducing itself gracefully.

As an FYI here is a break down picture of the Siri-Gm1 unit


From this you can see that there are 2 separate modules. The Sirius unit that gets mass produced and the 'Third party add-on communication' module. I owned an Alpine head unit in another car and when adding Sirius I got a near identical unit but instead of a Sir-GM1 bottom half, it said Sirus-Alpine on it.

I think you are right that this Third party communication (translation?) device is ignoring the commands from the PAL on the Class 2 data and causing havoc.


Well Id like to see if any other vett peeps have a NAV,PAL and Sir-Gm1 working and then find out what is different from their car to mine.

thank you for your replies jbeidl/john

cheers
chad

 

Where did you measure the audio? If you measured at the XM/SirGM1 connector, you will see audio whenever either XM or PAL is operating. The audio signals are "DOT Or'ed" (hard wired together) in the GM supplied cable.

The only real way to know is to measure the current going into the SirGM1, it should be very low in "sleep" mode.

Save The Wave,
John

 

I'm happy to see that John is trying to help you out.

And I'm concerned that you couldn't make contact with me - I don't recall getting an email or PM, but perhaps I missed it. My email is at the end of this site:

http://www.kawal.net/pal%20install.htm

I'm also interested in your problem because it seems others have been successful with a PAL and a Sirius module:

http://forums.corvetteforum.com/c6-c...l-install.html

Since I haven't tried it myself, I can't say for sure, but perhaps you could PM the guys who are using the Sirius module and they could provide their experience.

Ray

 

I have the PAl installed with Rays harness and the SIRGM1 with no issues. This is on my 08 with Nav
PM me with any questions....