I got a $30 keyless entry system off e-bay and installed it. It works great so far and is a wonderful feature to have.
Car Wire -- Keyless Wire -- Function
Brown -- Black -- Ground
Red -- Red -- 12V
Green/Black -- Green -- Lock
Green/Purple -- Blue -- Unlock
Here are some pictures of my install:
Pull Back the trunk liner on the driver's side and expose these wires:

Splice into the Lock/Unlock wires and connect the constant 12V and ground wires:

Here is the unit stuck to the side of my car with velcrow:

Size of remote:

After re-installing trunk liner:

Other random pictures during installation:
My friend Jeff (JHinck1414) has the 318is and also did this install


Let me know if you have any questions about the install. This write up helped out alot, but i just mounted mine in a different place:
Here is the unit i got off e-bay:
Car Wire -- Keyless Wire -- Function
Brown -- Black -- Ground
Red -- Red -- 12V
Green/Black -- Green -- Lock
Green/Purple -- Blue -- Unlock
Here are some pictures of my install:
Pull Back the trunk liner on the driver's side and expose these wires:
Splice into the Lock/Unlock wires and connect the constant 12V and ground wires:
Here is the unit stuck to the side of my car with velcrow:
Size of remote:
After re-installing trunk liner:
Other random pictures during installation:
My friend Jeff (JHinck1414) has the 318is and also did this install
Let me know if you have any questions about the install. This write up helped out alot, but i just mounted mine in a different place:
Here is the unit i got off e-bay:
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