Replace left tail light assembly on 2003 325i- have replacement lens, but not sure how to remove old cracked lens and install replacement

How Do You Change Tail Light Bulb
Remove the wiring harness from the tail light lens assembly. Disconnect tail light bulb from the wiring harness socket. Reconnect the wiring harness to the tail light lens assembly. To confirm proper installation of the new tail light bulb, place the key in the on position.
IT IS VERY SIMPLE OR GO TO AUTOZONE AND HAVE THEM CHANGE IT OUT FOR YOU AND WATCH THEM ONCE. GOOD LUCK.

1) Open trunk
2) Remove small round plastic access panel with a flat tip screw driver by prying open
3) Remove flat tip screw holding tail light assembly
4) Remove tail light assembly by pulling outward, careful not to break plastic guide/nub
5) Disconnect wiring connectors
6) Remove plastic housing access plate on back of tail light assembly by twisting/turning tabs until they click and then lift access plate from tail light assembly
7) When viewing the the bulbs, the turn signal bulb is the bottom left bulb
8) Install in reverse order, ensuring tail light seal seats properly during installation

2014 Newest Automatic V8 X6 Key Cutting Machine
Purchase a replacement tail light for your vehicle. You can find a broad selection by visiting the website listed in Resources or by going to your local automotive parts store.
Locate the tail light. You can find it on the rear of your car, located on the left and right sides. The lens color will vary depending on the type of vehicle that you have, but in most cases it will be red and will have red lights that light up when you press the breaks.
Remove the screws that are located on the corners of the plastic lens and lift off the lens. You will now see the bulb.
Place the new tail light in the place where you removed the old tail light. Make sure that you are putting the new tail light on right-side up. The screws will not line up and the tail light will not fit properly if it is upside down.
Replace each one of the screws.

Simple.. open the hatch. You'll see 2 screws on the inside of the lens, remove them. Now pull the lens assembly out slowly. No need to remove the wire connector. You'll see 3 caps, simply twist the one containing the bulb you need to replace. Reverse order for re-installation.

Rear Turn Signal, Brake and Parking Lights

1. Remove the tail light assembly screws, then the assembly.
2. Disconnect the twist lock socket from the lens housing. NOTE: To remove the bulb, turn the twist lock socket (at the rear of the housing) counterclockwise 1?4 turn, then remove the socket with the bulb; replace the bulb if defective. Fig. 7: Remove the tail light assembly screws, then the assembly - wagon shown Fig. 8: Twist the socket counterclockwise to remove from the housing Fig. 9: This type of bulb simply can be pulled out of the socket for replacement To install:
   
3. Attach the socket assemblies to the back of the lamp unit.
4. Install the lamp assembly to the vehicle with the mounting screws.

License Plate Light

1. Remove the lens screws.
2. Once the lens is removed you, can access the bulb and replace if needed. To install:
   
3. Install the new bulb, then attach the lens to the body of the vehicle.

Center High Mount Stop Lamp

1. Remove the screws securing the lamp cover.
2. Remove the mounting nuts, then unplug the electrical harness to the lamp assembly.
3. The lamp now should come out. To install:
   
4. Position the lamp assembly to the vehicle, then attach the electrical harness to the lamp.
5. Install the mounting nut, tighten to 62 inch lbs. (7 Nm).
6. Attach the lamp cover. Fig. 10: Exploded view of the center high mount stop lamp assembly - wagon shown
   Fig. 11: Light bulb application chart for all models with non-European headlamps
   Fig. 12: Light bulb application chart for Buicks with European headlamps
   Fig. 13: Light bulb application chart for Oldsmobiles with European headlamps
   

Tail/Turn Signal Lamp Removal & Installation Cab/Chassis

To Remove:

1. Disconnect lamp assembly electrical connector.
2. Remove nuts and lamp assembly from bracket.
3. Remove lens screws.
4. Remove lens, gasket and bulb.

To Install:

1. Install lamp assembly and nuts to bracket.
2. Connect electrical connector.
3. Install bulb, gasket and lens.
4. Install lens screws.

Except Cab/Chassis

To Remove:

1. Lower endgate.
2. Remove 2 tail/turn signal lamp assembly retaining screws.
3. Rotate tail/turn signal lamp assembly and remove from vehicle.
4. Disconnect lamp assembly electrical connector.
5. Remove bulbs by pulling straight out of bases.

To Install:

1. Install bulbs by pushing straight into bases.
2. Connect electrical connector.
3. Install tail/turn signal lamp assembly to vehicle and secure with 2 screws.

Removal & Installation Cab/Chassis

To Remove:

1. Disconnect lamp assembly electrical connector.
2. Remove nuts and lamp assembly from bracket.
3. Remove lens screws.
4. Remove lens, gasket and bulb.

To Install:

1. Install lamp assembly and nuts to bracket.
2. Connect electrical connector.
3. Install bulb, gasket and lens.
4. Install lens screws.

Except Cab/Chassis

To Remove:

1. Lower endgate.
2. Remove 2 tail/turn signal lamp assembly retaining screws.
3. Rotate tail/turn signal lamp assembly and remove from vehicle.
4. Disconnect lamp assembly electrical connector.
5. Remove bulbs by pulling straight out of bases.

To Install:

1. Install bulbs by pushing straight into bases.
2. Connect electrical connector.
3. Install tail/turn signal lamp assembly to vehicle and secure with 2 screws.

Look in the trunk, Pull back the carpet where the light would be. The carpet may be held in place by 2-3 big wing nuts. Once you remove these and pull the carpet back, you will see where your tail light assembly is bolted. The whole assembly will come out, take out the bulbs/harness. Then re-install your new assembly. It really takes about 3-5 min to do and no special tools.

Entire assembly must be changed.

left tail light is not real. Have a look under boomper. Ther is no kable. Is only one tile light in most of cars.