[caddytech69]

ok so i have a 2006 northstar sts that ive been trying to fix for 3 weeks ive researched and circuit tested almost every part and article on this problem, i put a new ipm module in and check grounds power and communication on the high speed data bus, the issue is the vehicle will not start green light on start button does not illuminate and accersory mode turns on at its own will, i have no comminication to ipm, dscc, esc, if vehicle sits for an hour with negative battery cable disconnect it will run for 5 mins then act up, i have no idea where to contiune, i check other forums and check grounds under drivers seat no correction found

 

[dkozloski]

What is the back story? When did all this begin?

 

[caddytech69]

vehicle came in with a shuts off while driving/ no crank concern, found a bad cell in battery and no comminication with the modules i stated thats all i know about the back story cannot find any aftermarket accesories or eletrical issues

 

[dkozloski]

It would be great to find out what was the last thing they were doing when it all went to he!!.

 

[caddytech69]

i have no idea, it comes back to life like i said if you unplug the battery for an hour and acts normal for about 5-10 mins then it losses communication and all gauges stop working, abs tcs and engine light pop on but engine still runs, until you shut it off it will not re-start

 

[dkozloski]

Looking at it from an electronic tech's point of view, it's a heat related electronic problem. Get out the old freeze mist and cool the modules one at a time until you find something that makes a difference.

 

[Frnkbooth]

My suggestion would be to check the start flow chart again in the service manual. Meaning what factors determine green light start ready. Then check each condition after fail. Additionally, if you have a known good vehicle around, start to compare can buss communications. It sound like you are missing one of the conditions for a green light because when it is it on, you can start. Not all the signals come from the IPM, so the one you are missing is the problem.