Chevrolet Uplander 9s12h128

**jomberykaso** · 5th November, 2014, 04:27 PM

Need to know how to read it. Bdm points location please.

THANKS IN ADVANCE

**jomberykaso** · 7th November, 2014, 10:23 PM

ANYONE?, PLEASE, I DONT WANT TO DESOLDER THIS MCU

**kelekele** · 7th November, 2014, 10:51 PM

What tool you use?Why dont simply trace lines from points to mcu legs?
You need 4 pins : ,RESET ,BKGD,VDD and VSS.

**specnaz** · 17th November, 2018, 05:41 AM

I'm strugling with this one , I hooked it up top left bdb - bkgd to serial pin 6 , bottom left - serial pin 9 vdd . middle low bdm to reset serial pin 7 , right bottom bdm to vss serial pin 5
But I keep getting BKGD low and I'm not sure why.
Unless I got the BDM points wrong . If i try to trace with multi meter i get conductivity on multiple pins on the mcu

**clusters** · 17th November, 2018, 08:22 AM

Cluster right side up

GND RESET 5V
BKGD N/C N/C

**specnaz** · 17th November, 2018, 10:03 PM

Originally Posted by clusters

Cluster right side up

GND RESET 5V
BKGD N/C N/C

I'm not sure what you mean by right side up for cluster?

**specnaz** · 18th November, 2018, 03:09 AM

here's how i got it hooked up but i keep getting BKGD High error now ... any ideas?
pinout.jpg

**clusters** · 18th November, 2018, 05:01 AM

That's upside down

Right side up means top at the top and bottom at the bottom. As opposed to upside down.

I guess you need a picture then maybe it will be clear.

Yellow - BKGD
Brown - GND
Green - RESET
White - 5V

**BYTES** · 18th November, 2018, 05:14 AM

I get same
error with upa some
times i gotta use
different programmer same connections never understood why same connections work on different programmer and on some programmer dont work

**specnaz** · 18th November, 2018, 10:11 AM

Originally Posted by clusters

That's upside down

Right side up means top at the top and bottom at the bottom. As opposed to upside down.

I guess you need a picture then maybe it will be clear.

Yellow - BKGD
Brown - GND
Green - RESET
White - 5V

Thanks! hmm , well two top right points aren't taking any solder anymore, tried with extra flux but it just doesn't stick to it, points are straight white like there was some kind of corrosion damage or something... it looks like it's missing copper , i'm now thinking it's gonna be impossible to jump it to the 112 pin mcu pins...

**clusters** · 18th November, 2018, 02:15 PM

Originally Posted by specnaz

points are straight white like there was some kind of corrosion damage or something... it looks like it's missing copper

Or like you burned the pads off.

Easy, follow the trace to another point.

**specnaz** · 18th November, 2018, 10:04 PM

no, I haven't touched those pads at all , i soaked all 6 with flux before applying solder and those two didn't wanna take it at all, and they did look different in color before i started any work..

**specnaz** · 28th November, 2018, 06:59 AM

This worked flawlessly with UPA , I got new cluster and test points were better , ODO I got from junk yard had 320k and I corrected it to 203k with TachoSoft , using Buick Allure calc