Hello I have a 2002 chrysler town and country lsi 3.8 and I'm installing a tcm and after installing do I need to get that reflashed or will the computer learning itself

SOURCE: chrysler 2000 town and country says it's the tcm

Here's the location of the transmission control module.

SOURCE: radiator fan relay,2001 chrysler town country

the relay is located in the power distribution box under the hood the relay will be a square black or gray cube just pull out and make sure you rerplace it with the same type relay. refer to your owners manual for any questions regarding the fuses and relays

SOURCE: how to remove starter for 2002 chrysler town &

There are two bolts to remove, opposite sides. One is a normal bolt, the other one is hidden by wires. Remove the nut on the ground wire, remove the ground wire, use deep socket over this to remove the bolt. It's easier than you think, about an hour and a half total.

SOURCE: Chrysler town and country Memory Seats

Memory selector is on driver's door, First set driver 1 seat and mirror positions, then press and release memory "s" button. then press and release memory selector "1" button. repeat for # 2 driver substituting memory selector 2 in step 2. hope this will help you

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SOURCE: my 2002 chrysler town and country is displaying

The 1684 is about the battery supply to the transmission contol module having been lost sometime in the recent past. It could be an actual disconnect of the battery occured, or through some testing that happened, or a loose wire but in any case I doubt it would affect the engine running.
On the 1297, that one is very specifically pointing to the manifold absolute pressure sensor which is mounted directly to the intake manifold. It has several possible causes:
the 5V supply to the sensor may be open or grounded and that can be verified by reading the voltage on the violet/white wire with the ignition switch in the run position. The signal wire can be open or shorted to ground and that could be checked by measuring between the plug to the module (dark green/red wire) and pin 36 of the plug to the engine controller. The sensor could be loose in its mounting position.
But most likely the sensor itself is faulty and it is easy to replace (a couple of screws). It should cost less than $100 for the part itself.
I would therefor tell the mechanic to examine this MAP sensor and verify what is the status of this sensor and its circuit before doing anything else. I can't give you any opinion about the noises but if the MAP sensor signal is lost then the fuel/air mixture will be imperfect which will often cause not only rough idling but even refusal to start.
Don't authorize opening the engine until you are satisfied that the MAP code has been solved by erasing it and trying to restart the engine and having ir no longer appear. That is the first order of business.