time to show off the offboard
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Location: Cleveland, OH
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![crunkfrunk is on a distinguished road](https://www.gmforum.com/images/reputation/reputation_pos.gif)
![Cool](/gm/images/icons/icon6.gif)
so after bricking my pcm and searching around the dhp forums i found that many people with bonnevilles had problems with failed writes while the pcm was in the car, with some DIY directions and a trip to morad, one of the benefits of living in cleveland
, i got it all fabbed up and am proud to say i have had a 100% success rate of writing pcms
unfortunately i didn't think to take any pics while making it but heres the end result
![](http://i12.photobucket.com/albums/a230/crunkfrunk/100_1198.jpg)
here is the connector, it is the blue harness from the pcm and the OBDII connector, the 2 wire hanging out are for power
![](http://i12.photobucket.com/albums/a230/crunkfrunk/100_1199.jpg)
the battery charger i use to power everything, this way no losing the pcm mid-write due to low battery voltage
![](http://i12.photobucket.com/albums/a230/crunkfrunk/100_1200.jpg)
offboard and power
![](http://i12.photobucket.com/albums/a230/crunkfrunk/100_1201.jpg)
simply connect your pcm, don't forget to tighen the screw![Wink](https://www.gmforum.com/gm/images/smilies/wink.gif)
![](http://i12.photobucket.com/albums/a230/crunkfrunk/100_1202.jpg)
then all i have to do is connect my dhp interface
![](http://i12.photobucket.com/albums/a230/crunkfrunk/100_1203.jpg)
turn on power, i used 12 low at first b/c i didnt wanna fry the pcm, but couldnt connect so i tried 12 high and no more problems, not in the pic but there is a switch for ignition power built into the harness
![](http://i12.photobucket.com/albums/a230/crunkfrunk/dhpwrite.jpg)
mid-write, battery voltage is showing ~14v
![](http://i12.photobucket.com/albums/a230/crunkfrunk/dhpwritedone.jpg)
and success! all done in about a minute
if anyone is interested in parts for making one i can get them pretty cheap, or i could get the parts, fab up, test, and ship it to you
![Very Happy](https://www.gmforum.com/gm/images/smilies/biggrin.gif)
unfortunately i didn't think to take any pics while making it but heres the end result
![](http://i12.photobucket.com/albums/a230/crunkfrunk/100_1198.jpg)
here is the connector, it is the blue harness from the pcm and the OBDII connector, the 2 wire hanging out are for power
![](http://i12.photobucket.com/albums/a230/crunkfrunk/100_1199.jpg)
the battery charger i use to power everything, this way no losing the pcm mid-write due to low battery voltage
![](http://i12.photobucket.com/albums/a230/crunkfrunk/100_1200.jpg)
offboard and power
![](http://i12.photobucket.com/albums/a230/crunkfrunk/100_1201.jpg)
simply connect your pcm, don't forget to tighen the screw
![Wink](https://www.gmforum.com/gm/images/smilies/wink.gif)
![](http://i12.photobucket.com/albums/a230/crunkfrunk/100_1202.jpg)
then all i have to do is connect my dhp interface
![](http://i12.photobucket.com/albums/a230/crunkfrunk/100_1203.jpg)
turn on power, i used 12 low at first b/c i didnt wanna fry the pcm, but couldnt connect so i tried 12 high and no more problems, not in the pic but there is a switch for ignition power built into the harness
![](http://i12.photobucket.com/albums/a230/crunkfrunk/dhpwrite.jpg)
mid-write, battery voltage is showing ~14v
![](http://i12.photobucket.com/albums/a230/crunkfrunk/dhpwritedone.jpg)
and success! all done in about a minute
if anyone is interested in parts for making one i can get them pretty cheap, or i could get the parts, fab up, test, and ship it to you
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