Security Light Flashing
Car had intermittent security light flashing with code b2960. Replaced pass lock. Now car starts and runs but security light stays on solid with same code. Shut key of and then back on security light flashing. Reprogram pass lock and same thing happens. New oe gm pass lock
When you replaced the passlock, did you replace the key?
The passlock looks for forced rotation, If the key is binding/sticking due to a worn or improperly cut key it can set a theft.
Here is the code set criteria from service information. Conditions for Setting the DTC The body control module (BCM) will inspect for a valid code when the ignition is rotated from ON to CRANK and will continue to monitor the signal during the engine running period. The BCM is reading a valid but different code value than previously learned form the Passlock™ sensor. Action Taken When the DTC…
Albin has a valid point, How did you do the relearn? I would try it again with a charger on the battery after a battery disconnect. No add on accc.?remote start? Can u read any bcm theft data , what are you seeing during crank .
Did that . Battery disconnect for 10 minutes with terminals shorted to each other. No added acc . When you crank it says not recognized. did relearn three times. 10 minutes on till light goes off and again two more times
Are the ignition switch inputs good ? your going to have to see what your pass lock voltages are at the bcm you may have a bad bcm here
Do you have a scope pattern from pass lock to bcm to now what is good
New battery and cables are clean and tight
No did not . New tool next year . You can buy for under 8 hundred right now oem
Is this a theft deterrent module or a 0-5 v passlock sensor??
Last few we had like that it was bcm gm seems to have a pattern failure on them for this problem
Hello Randy. I had this issue on my own hummer. I replaced ignition switch and code did not return and security light stayed off.
Does this vehicle have a remote start installed? It sounds to me like it is seeing another key or the theft system has been bypassed by remote start.
Post with fix. Bad new pass lock. Replaced with another new one and all works fine now Thanks for all the posts
What process did you use to come to the resolution of the problem?
5 volt signal at back of switch . No change of voltage with bad switch stuck at 5v
Thanks.... things like that help others with working with problems like this. By using the code set criteria that is listed in service information, it sure makes finding things like this pretty easy.
yep. Butt who would of thought NEW OE switch would cause this . you now the saying New Ever Works
To me, it doesn't matter. If the new part didn't fix the problem, it still doesn't work. In this case, you have a code as a direction. This system is pretty simple, and a scope will root out the problem pretty quick.
True I posted this on sunday because it happened at closing time on friday. And I now how the system works . And on monday I checked 5 volt ref not with a scope butt with my old school vantage and found the problem . I was checking to see if this a problem other shops have had after replacing pass lock and some said bcm . No bad oe part