2009 prostar left turn wont go out

Can you do B C M reset?

 

Disconnect your batteries for 1 minute and try again. Turn lights are computer output controlled.

 

There is no flasher, the body controller computer controls it and does the flashing itself.

 

When ever i work on IHC newer BCM, i notice the wires are always stuffed behind the the kick panel, believe it or not i solve some problems just by not putting in the center bolt.

If your in detroit i have diamond logic controller software and could possibly help you. Here's a a BCM im fiddling with now

 

The red pin if your truck shares the same BCM is where your flasher is located

 

Thats a good price!

 

Has any trouble shooting been done? Don't just throw an expensive body controller at it if you don't know. Are your left turn lights on solid, or flashing all the time? The body controller could be getting a false signal due to a wiring problem. The input signal to trigger the left turn is at wire cavity A7 of body controller connector J3. The wire is A56B. The way it works, the turn signal lever will make a ground path for this wire and when the body controller detects A7 has been grounded it will turn on the left flasher which comes out of connector J1, cavity B, wire A56N. So if wire A56B is shorted out somewhere your lights will be on all the time. This can also be checked by someone with Diamond logic builder software to see if the input signal has been triggered or not.