Where is the BCM on my 2007 pont g6 gt - 2007 Pontiac G6

Power windows fuse 30 amp - located on the fuse block on the BCM - body control module .
Body Control Module (BCM)
Under the right side of the center console, near the I/P . Remove the plastic right side panel .

2007 g6 gt ????? Pontiac ? The headlamp switch is a input to the BCM - body control module , the BCM turn's the park / headlamps on .
Park, Tail and Marker Lamps
The park, tail, and marker lamps, including the license lamps, are turned ON when the headlamp switch is placed in the PARK or HEADLAMP position, or anytime the headlights are requested. The PARK LAMPS fuse in the rear fuse block supplies battery positive voltage to the PARK LAMP relay switch contacts. The PARK LAMPS fuse in the rear fuse block also supplies battery positive voltage to the PARK LAMP relay coil. When the park lamps are turned ON, the body control module (BCM) energizes the park lamp relay. Current flow is from the PARK LAMP relay to their respective park and marker lamps and to ground. Ground is provided at G101, G102, G401, and G403.

Body Control Module (BCM)
Under the right side of the center console, near the I/P

It's on the right side of the center console , plastic cover pulls off

Why ? If you replace the BCM it will need to be programmed . Dealer !!
This vehicle's body control module (BCM) has a bussed electrical center integrated into the housing. Body control relays and fuses are installed directly on the BCM, which simplifies wiring and junction blocks on the vehicle. The body control system consists of the BCM and its associated controls. Battery positive voltage is provided to the BCM from IBCM BATT 1 fuse and the IBCM BATT 2 fuse in the underhood fuse block. The module grounds are wired to ground G201, G203 and G305. The BCM is wired to the GMLAN High speed serial data buss, and the GMLAN Low speed serial data buss, as well as discrete input and output terminals to control the functions of the vehicle's body .
Trying to save you some agravation an wasted time an money . For a do it yourselfer , this is nothing you should be messing with ! You don't have the training to be messing with the BCM .
A new body control module (BCM) must be programmed with the proper regular production option (RPO) configurations. The BCM stores the information regarding the vehicle options and if the BCM is not properly configured with the correct RPO codes the BCM will not control all of the features properly. The Tech 2 software will automatically prompt you with the various RPOs available for the vehicle. Ensure that the following conditions exist in order to prepare for BCM programming:
This entire procedure has been reviewed before starting
The battery is fully charged.
A CANdi module is installed between the vehicle and the scan tool.
The ignition switch is in the ON position.
The data link connector (DLC) is accessible.
All disconnected modules and devices are reconnected before programming.

probably not... if you get one from a junker, it will need to be programmed... no way around it

Seat belts should never be repaired only REPLACED.Sorry but thats tats what needs to be done. Safety first.

Check the wiring on the headlight. You may have a damaged wire or bad ground.

You didn't state what size engine you have. The filter is round in shape, if it isn't under the car near the gas tank, then it is inside the gas tank, Which I think is a stupid place for general motors to put it.

CHECK YOUR BRAKE LIGHT SWITCH THAT IS ON YOUR BRAKE PEDAL UNDER THE DASH