Personally, I have never heard of anything like that, but maybe, just maybe, they are trying to do some type of checks to help narrow the problem. Could be one of the TAC guys having a brain storm (or brain fart).
Some things that seem strange, sometime finds the problem. It appears your problem is intermittent, which is different than mine, my warnings are always on.
As for the policy about switching out modules. I see no restriction on this part, and my dealer had no problems. However, this is a big problem at GM (and I assume with all manufacturers), the switching of modules but not fixing the problem. BCM's were replaced like some people replace wives, and the failure rate was about 10% of those returned.
The Tech 2 can be used to check signals and see if modules are talking with other modules. Basically, the TCCM just sends a signal to the PCM that 4 lock has been engaged, and the remaining discussion between modules (BCM, TCCM and PCM) takes place on the serial data circuit.
Let's hope the dealer is being straight, I guess they have no reason to lie about it.
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Black Sheep Hummer Squadron
(ME TOO)
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