Radio Code fix. - Saab 9-5 Bulletin Board - Saabnet.com

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Radio Code fix.
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Posted by Gene N [Email] (#1094) [Profile/Gallery] (more from Gene N) on Tue, 26 Feb 2019 20:29:39 Share Post by Email
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On January 14th, Snowmobile started a thread about 9-5 radios losing their memory when disconnected from the battery. This a chronic problem with the Harmon/Kardon Pioneer radios in the1999-2005 model years. Disconnecting the battery would put the radio automatically in the divorced state and display “Radio Code” on the SID. A Tech 2 would be required to remarry the radio to the car until the next time the power was interrupted. (Here is the original thread http://www.saabnet.com/tsn/bb/9-5/index.html?bID=277759/)

Like Snowmobile, I looked for a battery backup inside the radio and gave up when I couldn’t find one. I then suspected an EEPROM was the problem, but it would have been impossible to find, just by looking at the board. Snowmobile found this service manual for the 2004-2005 model years: https://elektrotanya.com/pioneer_fx-m2037_m2137_m2337.pdf/download.html

Once I saw that, I searched and found this manual for my model year, 2002: https://elektrotanya.com/saab_pioneer_fx-m2117_sm.pdf/download.html

The 1999-2001 years used a Pioneer FX-M2116, but it did not seem to be significantly different from the FX-M2117 or the FX-M2137.

That is the background. You can skip to the next paragraph if you want while I descend deep into Electrical Engineer nerd-speak. The EEPROM from the schematic is a Seiko S-29220A Serial EEPROM with a capacity of 2k bits in a 128x16 bit organization, with a data retention value of 10 YEARS. The S-29220A is no longer available and dmz789qqq suggested using a 93AA56B-I/P serial EEPROM as a replacement, which is in a PDIP-8 through-hole package. Once I got the board out of the chassis and realized almost all components were surface mounted, I knew the 93AA56B-I/P was not going to work. The external dimensions of the EEPROM pointed to an SOP-J8 package that was not offered on the 93AA56B-I/P. The EEPROM I found that worked is a BR93G56FJ made by ROHM, and can be ordered from Mouser. Here is the link https://www.mouser.com/ProductDetail/ROHM-Semiconductor/BR93G56FJ-3AGTE2?qs=sGAEpiMZZMuVhdAcoizlRVBDy89uKeWDzWTE2%2F4gyPo%3D

The EEPROM is located on the tuner board. The front of the radio is on the bottom of this picture.

http://www.saabnet.com/tsn/members/photos/1094/35528.jpg ">


This overlay from the service manual shows the orientation of the chip. The dot on the chip marks pin 1.

http://www.saabnet.com/tsn/members/photos/1094/35529.jpg ">


So far, replacing the EEPROM has worked on the two radios I tried it on. One of the radios would lose its pairing when the battery was disconnected. The other radio was a used radio that had not been divorced correctly. The seller gave me the supposed VIN of the donor car, but I could never get the radio properly divorced by changing the DICE VIN. Replacing the EEPROM on this radio caused it to reset from married to divorced. I was then able to then marry the radio to my car as a test.


->Posting last edited on Thu, 28 Feb 2019 05:16:58.
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