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Old 05-03-2012, 04:55 PM   #31
pigseye
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Re: Bypassed TheftLock on GM Chevy Class II MP3 CD HU

Quote:
Originally Posted by Wallstreet22 View Post
Yes if you unlock the 2001 player.
Is it RDS?
Does it require a code?
OR Does the BCM signal the radio to operate.
I sent my 2004 RDS out for an EProm replacement as I could not find the eprom nor was I able to have others define or locate it on my radio. Some disconnect the eprom. Mine was replaced and burnt to be accepted to any GM vehicle.
I don't Have the radio yet but will by today. I'll check to see if it has RDS and then remove the EEPROM and install this weekend.

Will keep you all posted on progress.

Thanks
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Old 05-05-2012, 08:59 PM   #32
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Re: Bypassed TheftLock on GM Chevy Class II MP3 CD HU

Quote:
Originally Posted by Wallstreet22 View Post
Yes if you unlock the 2001 player.
Is it RDS?
Does it require a code?
OR Does the BCM signal the radio to operate.
I sent my 2004 RDS out for an EProm replacement as I could not find the eprom nor was I able to have others define or locate it on my radio. Some disconnect the eprom. Mine was replaced and burnt to be accepted to any GM vehicle.
Hi WS22,
I opened up my radio and found the correct EEPROM on the right side of the deck near the face plate and audio controls. There are two 8 pin chips next to each other and the correct chip is the one with the very faint printing on it.

My next step is to desolder this chip and try installing it tomorrow.

Thanks

Last edited by pigseye; 05-06-2012 at 10:35 PM. Reason: wrong location of chip
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Old 05-06-2012, 09:09 PM   #33
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Re: Bypassed TheftLock on GM Chevy Class II MP3 CD HU

I need help on my car I want to cuztomize it in something different on the style I want but I dont know how.
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Old 05-06-2012, 10:40 PM   #34
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Re: Bypassed TheftLock on GM Chevy Class II MP3 CD HU

Quote:
Originally Posted by pigseye View Post
Hi WS22,
I opened up my radio and found the correct EEPROM on the right side of the deck near the face plate and audio controls. There are two 8 pin chips next to each other and the correct chip is the one with the very faint printing on it.

My next step is to desolder this chip and try installing it tomorrow.

Thanks
Well I screwed something up removing the EEPROM and the modified radio is dead.

Took it apart to see if I could use the CD player in the old radio but there is no connector on the old radio for a CD player. Oh well, I'm back to a radio/cassette for now.

You guys already know this but what a pain in the butt to get the radio out. It feels like you're taking the whole dash out just to get to the radio. Kind of sad that the Chevy engineers thought this dash set up was a good idea. Heck, it's so easy to remove a radio from a Malibu. Why would they design the Impala this way???

Oh well, lesson learned on multiple fronts. I'm going to keep my eyes open for another deck to try again.

Thanks all
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Old 05-07-2012, 10:50 PM   #35
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Re: Bypassed TheftLock on GM Chevy Class II MP3 CD HU

Might try soldering the chip back? Maybe you've tried that already :-/. Yeah, I've been poking around inside too many of these things, too long, so I feel for ya. But when you have a success, sitting back to listen to it hum some good tunes feels great . I'm still waiting for that point on this latest project though...
Wishing success, ;-] Tony
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Old 05-07-2012, 10:55 PM   #36
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Re: Bypassed TheftLock on GM Chevy Class II MP3 CD HU

Quote:
Originally Posted by SpecInfoTinkerMod View Post
Might try soldering the chip back? Maybe you've tried that already :-/. Yeah, I've been poking around inside too many of these things, too long, so I feel for ya. But when you have a success, sitting back to listen to it hum some good tunes feels great . I'm still waiting for that point on this latest project though...
Wishing success, ;-] Tony
Thanks Tony,
Unfortunately, I had to cut part of the chip out because I couldn't get a couple of legs to unsolder. oh well, I'll keep looking for a salvage yard radio for cheap. Sure miss playing CDs though.

Steve
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Old 05-07-2012, 11:19 PM   #37
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Re: Bypassed TheftLock on GM Chevy Class II MP3 CD HU

Steve,
Yeah, I came close to destroying mine getting it loose. Wallstreet22 mentioned cross-compatible EPROMs; I would be interested to know who burns those to see about getting one for my radio - possibly such a thing would work for yours too.
Tony

Quote:
Originally Posted by Wallstreet22 View Post
Yes if you unlock the 2001 player.
Is it RDS?
Does it require a code?
OR Does the BCM signal the radio to operate.
I sent my 2004 RDS out for an EProm replacement as I could not find the eprom nor was I able to have others define or locate it on my radio. Some disconnect the eprom. Mine was replaced and burnt to be accepted to any GM vehicle.
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Old 05-08-2012, 08:22 AM   #38
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Re: Bypassed TheftLock on GM Chevy Class II MP3 CD HU

PM thecat100 at aol dot com
Quote:
Originally Posted by pigseye View Post
Thanks Tony,
Unfortunately, I had to cut part of the chip out because I couldn't get a couple of legs to unsolder. oh well, I'll keep looking for a salvage yard radio for cheap. Sure miss playing CDs though.

Steve
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Old 06-16-2012, 07:06 PM   #39
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Re: Bypassed TheftLock on GM Chevy Class II MP3 CD HU

Anyone have any luck with a nav/dvd/cd head unit?

What a PITA.

DELCO # 25766997

Found one SMT part that could be it.

#9375366

Last edited by edwardteller2000; 06-16-2012 at 07:49 PM.
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Old 07-05-2012, 08:09 PM   #40
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Re: Bypassed TheftLock on GM Chevy Class II MP3 CD HU

Thanks for the help. Couldn't see spending $50 - $100 to unlock a head unit I bought for $35 on eBay. I unsoldered the power pin to the EEPROM. This unlocked the unit but it would flash every few seconds (as if it were losing power). So, I went ahead and just removed the whole chip. It works fine but, aside from the time, doesn't remember anything (radio presets, manual equalizer settings, CD track and time).
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Old 01-14-2013, 08:59 PM   #41
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Why the memory issues occur in non-class 2 and E&C 1.5 environments.

Hey guys,

I figured out why the memory issues exist when not using the data bus to operate the head unit, and, the simple answer is that when on a class 2 data bus, the head unit essentially never really shuts off completely. Instead, the head unit goes into a "sleep mode" type of function so that it may remain powered on for such things as chimes and OnStar. This continous hidden power on mode is what also keeps the unit for loosing it's memory.

The head units also used to act as a communication bridge middle man for OnStar and needed to be "awakened" at any given time for this system to work. By the time the GMLAN head units were released, due to queues from Panasonic, both GM and Delphi figured out a way to connect Onstar directly to the BCM, but, also have the head unit power completely down, yet still able to power on at a moments notice.

I haven't figured out yet how to re-enable this "sleep mode" in the units at this time.
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Old 03-23-2013, 04:40 PM   #42
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Re: Bypassed TheftLock on GM Chevy Class II MP3 CD HU

Hi guys, thanks for all the threads! took out the eeprom chip all together. No problems other than memory loss. i took a 03' HU out of a local salvage yard, modded the HU. Works in my 05' work truck but not my 05' Silverado. What gives right!! anyhoo still Tinkering!! Keep up the research guys.
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Old 04-16-2013, 03:15 AM   #43
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Re: Bypassed TheftLock on GM Chevy Class II MP3 CD HU

Hi. I had a 2004 Chev Avalance which I bought brand new. Shortly thereafter, I removed the original factory 6-disk headunit and replaced it with a factory GM 2005 NAV which I purchased from eBay. The orig headunit was put into the garage for years until I traded in my Avalanche last year for a new silverado hd. The NAV HU had been in my car so long that I completely forgot the truck had a different radio at one time. In any event, while cleaning out my garage recently, I found it and it seems like such a waste to have it just sitting here.

Is it possible to just use this on my garage bench with a 12V supply or will I need to do all the eprom chip removal thing that you all speak of here. Also, does anyone know the pinout schem for the rear? I only want/need the power and speaker connections. Although the Avalance was a 2004 model, I did purchase and take delivery in late 2003. Any help appreciated.
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Old 08-29-2013, 10:45 PM   #44
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Re: Bypassed TheftLock on GM Chevy Class II MP3 CD HU

Has anyone tried doing some kind of data dump on the eprom?
I've messed with eproms in ecm's a bit,wondering if this can be dumped and the data sorted?
Maybe a search for some part of the vin in the data will bring up something?

Thanks for all the great info,might be trying your fix.
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Old 08-30-2013, 02:36 PM   #45
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Re: Bypassed TheftLock on GM Chevy Class II MP3 CD HU

If you know the code, you can just turn it off...

Or are you saying, you are locked out and can't unlock the radio?
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