GM Repair Questions? Ask a Mechanic for Answers ASAP
There are a couple of possibilities that may cause your problem & it will require some inspection.
PIT3164B: Fuse 42 Opens When using The Power Windows Or Sporadic Door Locks - keywords electrical fuse glass inoperative link lock unlock open switch UBEC window - (May 8, 2009)
This PI was superseded to update model years. Please discard PIT3164A.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Power window fuse (#42 in the UBEC) opens at times. There are two possible scenarios.
Scenario #1) Fuse 42 opens when using either the drivers or passengers front window or sporadic operation of the door locks.
Scenario #2) When closing all windows at the same time, fuse 42 may open.
There are two possible solutions for this concern:
#1) Inspect the harness in each door for a chafe at the door check link. Repair any harness and reroute to prevent future contact or chafe. #2) This is a design characteristic. No repairs should be attempted. To reduce the likelihood of this situation from occurring, do not continue to operate all the windows completely open/closed at the same time and running the motor against the stops. This situation will produce the maximum current draw and can increase the chances for the fuse to open.
Note: Fuse 42 in the UBEC will be the fuse that may open if the windows are operated in this manor.
When I previously had this problem, it occurred once when I changed my battery. And then again when I removed the battery terminal to clean away some corrosion. Both times my window was in the up position. Everything returned to normal after 2 -3 weeks, for no apparent reason.
This time, I had simply been driving with my window half down. One window only. I was not operating more than the one window. Normally, when the shifter is placed in the "park" position, the doors unlock automatically. This time the doors did not unlock, as when the problem occurred in the past. I was not using the door locks in a sporadic manner what-so-ever. Are you suggesting that I replace fuse 42? And that it could be defective in some way?
I am bringing it in to my mechanic in the a.m. He did not know what the answer to the problem could be and said he will have to do some trouble shooting. His time trouble shooting is time on the clock and money out of my pocket. Any advice would be appreciated and worth the $18 if it can save some time.
Test the voltage at the # XXXXX fuse.There has been a # XXXXX cases where there is no voltage at this point.
If the voltage is good ,it is likely to be a computer fault.
I will let you know if your diagnosis is accurate.
You bet . You have a good evening.
It was the master switch.
$220 plus labor