I ordered a fancy pin removal kit and it seems to cover every kind of connector except the ones on my E39A ECM. Can anybody recommend a particular tool or kit that you KNOW has the right tools for the job?
You can have a dealer order these for you if you can't create an account or source using the two tool numbers. I gave example of connector from service manual with same ecm. Tool J-38125-213 fit all terminals marked I and tool J-38125-12A fit the terminal(s) marked II. You will see when you view the pdf.
J-38125-213 at https://gmtoolsandequipment.com/en-US/Pages/ItemDetail.aspx?SKU=J-38125-213
for most terminals on connector
J-38125-12A - for one terminal for the Powertrain Main Relay Fused Supply (1)