Pontiac G6 Key FOB Problem And Door Won't Unlock

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Remotes problem on my 2008 Pontiac G6 SE.
Question:
I have the 1SV base model G6. It did not come with a key FOB, but does have power door locks. The dealership says the car did not come with the key FOB because it does not have a receiver for remote keyless entry. The website (which sells remotes) indicates my car is equipped with remote keyless entry (based on my VIN) and they have a $44 remote that will work after a dealer or locksmith programs it.

My question: how can I tell without a doubt whether my car is equipped with the receiver short of spending the $$ for a remote and convincing the dealer to try it anyway?

Answer:
First I would need your VIN# so i can check options on your car for myself.

2008 Pontiac G6 3.5L.
Question:
left rear door power lock will not lock or un-lock. Troubleshooting already done is as follows.

Power lock assembly taken out of door with lock assembly still plugged into control wire harness. There is a approx. 4 volt quick pulse when lock switch pushed. Polarity reverses depending on the lock or unlock switch being pushed. The lock assemble with wire harness removed has approx. 20 ohms. All other power lock working fine.

Answer:
This looks like a very common problem of a bad lock / latch assembly. These are quite common on this and other body styles.

Tapping on it will sometimes get it to start to or try to work. Only other problem I have seen is chaffed or partially broken wires in the door-to-body passthrough.