Here is 2003 Mini Cooper s info from Audiovox :
Audio/Mobile Video
WIRE COLOR POLARITY LOCATION
Battery RED / BROWN (+) RADIO HARNESS
Accesory VIOLET/BLUE (+) RADIO HARNESS
Ground BROWN (-) RADIO HARNESS
Illumination GRAY/RED (+) RADIO HARNESS
Power Antenna WHITE (+) RADIO HARNESS
LF Speaker (+) YELLOW/RED
THESE WIRES ALSO GO TO THE FRONT LEFT TWEETER
LF Speaker (-) YELLOW/BROWN
RF Speaker (+) BROWN / BLACK
THESE WIRES ALSO GO TO THE FRONT RIGHT TWEETER
RF Speaker (-) BLUE/BROWN
LR Speaker (+) YELLOW/BLACK
LR Speaker (-) YELLOW/GRAY
RR Speaker (+) BLUE/VIOLET
RR Speaker (-) BLUE/GRAY
Steering Cntrls NO
Speed Cntrl OPTIONAL
Radio Security YES
Security
WIRE COLOR POLARITY LOCATION
Battery RED (+) IGNITION SWITCH HARNESS
Ignition 1 GREEN (+) IGNITION SWITCH HARNESS
Starter 1 BLACK/ BLUE (+) IGNITION SWITCH HARNESS
All Door Trigger BROWN / GRAY W / YELLOW DOTS (-) DR. KICK PANEL
YOU MUST DIODE ISOLATE BOTH TRIGGERS TO MONITOR ALL DOORS.
LF Latch BROWN / GRAY / YELLOW DOTS (-) IN HARNESS IN DRIVERS KICKPANEL
RF Latch BROWN / GRAY / YELLOW DOTS (-) IN HARNESS IN PASSENGER KICKPANEL
Trunk Trigger GRAY/BROWN (-) UNDER PASS. SIDE ROCKER PANEL
Hood Trigger GREEN/ VIOLET (-) PIN SWITCH UNDER HOOD
OR VIOLET/GREEN AT THE BLACK PLUG AT THE BODY CONTROL MODULE IN THE PASSENGERS KICK PANEL
Parking Lights BLACK (-) TOP OF THE STEERING COLUMN
OR AT BLUE PLUG AT THE BODY CONTROL MODULE IN THE PASSENGERS KICK PANEL
Remote Start
WIRE COLOR POLARITY LOCATION
Battery RED (+) IGNITION SWITCH HARNESS
Ignition 1 GREEN (+) IGNITION SWITCH HARNESS
Ignition 2 VIOLET/BLACK (+) IGNITION SWITCH HARNESS
Ignition 3 GREEN/ BLUE (+) IGNITION SWITCH HARNESS
Starter 1 BLACK/ BLUE (+) IGNITION SWITCH HARNESS
Anti-Theft Type TRANSPONDER
Anti-Theft Descript THE KEY SENDS AN RF SIGNAL TO THE BCM MODULE THROUGH AN ANTENNA LOCATED AROUND THE IGNITION CYLINDER
Tachometer BLACK / YELLOW (AC) @ COIL ON TOP OF THE ENGINE
YOU CAN ALSO USE A BLK/BLU YOU CAN ALSO USE AN INJECTOR. THEY ARE EASY TO ACCESS. THE COLORS ARE BRN/YEL, BRN/GRN, BRN/WHT, AND BRN/VIO
Speed Sense BROWN (AC) AT ABS CONTROL MODULE UNDER HOOD BETWEEN RIGHT STRUT TOWER AND FIREWALL Parking Lights BLACK (-) TOP OF THE STEERING COLUMN
OR AT BLUE PLUG AT THE BODY CONTROL MODULE IN THE PASSENGERS KICK PANEL
Brake Lights BROWN / GRAY (AC) @ THE BRAKE LIGHT SWITCH ABOVE BRAKE PEDAL
YOU MUST TEST WITH IGNITION ON
Reverse Lights BLUE / YELLOW (+) IN HARNESS IN DRIVER KICKPANEL
Modules LOCATION
Module 1 BCM - BODY CONTROL MODULE IS LOCATED HIGH IN THE DRIVERS KICK PANEL
Doorlocks/Windows
WIRE COLOR POLARITY LOCATION
Power Unlock WHITE/ BLACK OR (WHITE/ GRAY) (-) DRIVERS DOOR HARNESS
THESE WIRES STOP WORKING ON IGNITION, IF YOU ARE ADDING REMOTE START YOU WILL NEED TO MAKE CONNECTIONS TO THE DOOR LOCK SWITCH IN THE CENTER CONSOLE. REMOVE 4 SCREWS ON HOLDING THE GLOVE BOX IN. ACCESS WIRE FROM THAT SIDE. BOTH LOCK AND UNLOCK WIR
PowerLock BLUE/RED (-) DRIVERS DOOR HARNESS
FOLLOW SAME AS UNLOCK
Driver Mtr Unlock WHITE (REV) AT MOTOR IN DOOR
Driver Mtr Lock WHITE (REV) BLACK PLUG AT BCM IN PASSENGERS KICK PANEL
Pas Mtr Unlock BLUE (REV) BLACK PLUG AT BCM IN PASSENGERS KICK PANEL
Pas Mtr Lock BLUE (REV) AT MOTOR IN DOOR
Soldering is fun!