Security Light Flashing

Randy Diagnostician California Posted   Latest   Edited  
Unsolved
Chassis
2007 Hummer H3 3.7L (E) 4-spd (4L60-E)
B2960 - Security Light Staying On

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 

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Interesting
Michael Diagnostician
Texas
Michael Default
 

When you replaced the passlock, did you replace the key?

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Randy Diagnostician
California
Randy Default
 

no did not replace key

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Michael Diagnostician
Texas
Michael Default
 

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.

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Albin Diagnostician
Washington
Albin Default
 

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…

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Scott Owner/Technician
Ontario
Scott Default
 

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 .

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Randy Diagnostician
California
Randy Default
   

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

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Scott Owner/Technician
Ontario
Scott Default
 

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

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Randy Diagnostician
California
Randy Default
 

Do you have a scope pattern from pass lock to bcm to now what is good

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Randy Diagnostician
California
Randy Default
 

New battery and cables are clean and tight

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Tim Owner/Technician
Oregon
Tim Default
 

Did you try tech 2 to program,

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Randy Diagnostician
California
Randy Default
 

No did not . New tool next year . You can buy for under 8 hundred right now oem

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Caleb Diagnostician
Indiana
Caleb Default
 

Is this a theft deterrent module or a 0-5 v passlock sensor??

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Randy Diagnostician
California
Randy Default
 

5 volt

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Robert Owner/Technician
Virginia
Robert Default
 

Last few we had like that it was bcm gm seems to have a pattern failure on them for this problem

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Arsalan Manager
District of Columbia
Arsalan Default
 

Hello Randy. I had this issue on my own hummer. I replaced ignition switch and code did not return and security light stayed off.

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Randy Diagnostician
California
Randy Default
 

has new switch

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Tanner Instructor
South Carolina
Tanner Default
 

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.

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Randy Diagnostician
California
Randy Resolution
 

Post with fix. Bad new pass lock. Replaced with another new one and all works fine now Thanks for all the posts

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Albin Diagnostician
Washington
Albin Default
 

What process did you use to come to the resolution of the problem?

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Helpful
Randy Diagnostician
California
Randy Default
 

5 volt signal at back of switch . No change of voltage with bad switch stuck at 5v

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Albin Diagnostician
Washington
Albin Default
 

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.

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Randy Diagnostician
California
Randy Default
 

yep. Butt who would of thought NEW OE switch would cause this . you now the saying New Ever Works

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Albin Diagnostician
Washington
Albin Default
 

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.

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Randy Diagnostician
California
Randy Default
 

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

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