What is stored where? C5 BSI/MCU/DASH

[pflodin]

Hello.

I have a small problem with my Citroen C5 (1,6 hdi 2006 at 163000km. The speedometer stopped working last week and since I have another C5 (2005 2,0 HDI at 368000km) i decided tho shift the whole meter module between the two cars. Big mistake of course. I now have two cars at 368000km. I changed back but problem presisted. OK, I'm an idiot that did this, I know that so you dont need to tell me that. Something that I would verry much appriceate is if someone could explain to me where the Km is stored. It seems like the two cars acts differently, the old one seems to have the Km stored in bsi only and the newer one in both BSI and DASH. What do I need to do to sort out this an get the Km back to 163000 in the new car ? is it just the dash that needs to be reprogrammed or do I need to reprogarm the BSI and / or ECU as well ? (e.g did the BSI and / or ECU "sucked" the higher Km value from the dash i took from the older car ?) I have a garage nearby that says they can fix this with their programming tool , but I'm not shure he is right when he tells me that he just need to reprogram the dash an then the BSI will follow the new dash Km.

If someone could sort this out for me I would be verry gratefull.

Regards

Peter from mid Sweden

Car data

Citroen C5 1,6 HDI 2006

BSI ref 9654425680 9661940380 Sw 07.03 Ref 618910
ECU EDC16C34_DV6 ref 9653958980 9663245780 comp 9658945380 sw 05.01 diag 0D

[plagu]

you need to program both, the bsi and the dash,

the car stores mileage to both, and if you swap either one of those the higher value is taken to use and stored to both units.

[PETAR]

in dashboard must be have 908
in bsi 95128 or 256

[pflodin]

OK, Tanks, I guessed that was the case. Is it possible to use the chinese PSA BSI tool from ebay for the bsi ? is there a guide somewhere for this ?
i know that this is newbe questions, but even though I am used to program various types of microcontrollers etc, this is new to me.

And Petar, i would really appriceate a little explanation about those numbers.

Tanks in advance

[thunderwinged]

use PSA BSI tool?? i think no is good ideia , this tool no work good

[plagu]

PSA bsi tool is crap, you'll brick your bsi. Simplest way is to just desolder eeprom from both, read the dump and surely someone will fix you the mileage here.

[pflodin]

OK, I got hotair station etc and I am used to solder /desolde SMDs but I dont't have programmers that handles 68hc908 and 95128 / 256, any suggestions on buying programmers ?

And secound, is it no way to read the contents of the eeprom in the bsi without desolder the chip ? would be nice to have a backup if I ruin the chip.

Tanks in advance

/Peter

[plagu]

Sorry for late reply, get willem programmer, and you can use soic8 clip if you dont want to desolder but those dont always work.

[pflodin]

Tanks for the reply. ! Got myself a QG-4x programmer and have sucsessfully read the bsi. But that programmer dose't do the 68hc908 in the dash so I need to get something else. Have been recomended to buy UPA but I was hoping that I could build something with a MAX232.

/P