2001 Pontiac Montana back door locks work sporadically The automatic locks on the back doors are not always operating. If I lock the van I have to check to see if they locked. Sometimes they do but most of the time they don't. Same thing with unlocking the doors when the ignition is turned off sometimes they unlock and other times they don'. How can I fix this??

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Do you know how to test automotive electrical circuit's using a DMM - digital multi-meter an a wiring diagram ?

Electric Testing Techniques You Need to Know

The Trainer 32 How To Read An Automotive Block Wiring Diagram

Free wiring diagrams here http://www.bbbind.com/free_tsb.html
Enter vehicle info. year , make , model an engine size. Under system click on body & accessories ,then under subsystem click on power lock's . Click the search button then the blue link . Test the power an ground side of the circuit when they act up. This is how a professional technician would diagnose .
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