Door check strap
SOURCE: 2005 Chevrolet Silverado 2500HD 4x4 Oil Change Reset
Not positive 05 is the same but on my 02 you turn the key to the on position and pump the gas pedal 4 times.
SOURCE: 2005 Chevrolet Silverado Automatic door locks
I assume you mean that the central locking system will not lock the doors but you can do so manually.
Get inside the vehicle and close all doors.
On each rear door, lock and unlock the mechanism manually a couple of times. In other words do not use the key pad.
Then
leave both rear doors in the locked position (manual locking) and
operate the lock button on you key pad to operate the central locking
system. Wait a few seconds then hit unlock on your key pad and a few
seconds later hit lock on your key pad.
If the system fails to
lock your rear doors you will need to get the vehicle to an auto
electrician to check out the issue and rectify it for you. There are a
number of possible causes which cannot be identified without physically
checking the system. So you will need to have this rectified by a
professional.
under the intake manifold on a 5.3,theres 2 of them
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