2002 chev impala wiring

Can someone send me the wiring diagram for a 2002 chevrolet impala?  Im also wondering if its possible to just add a 4 channel amp and some new speakers to the factory cd deck, and how difficult is this to do?  Thanks kindly.

|       ITEM      |     WIRE COLOR     |POL|       WIRE LOCATION        | |              12V|red                 |+ |ignition harness *1        | |          STARTER|yellow              |+ |ignition harness *1        | |        IGNITION|pink               |+ |ignition harness *1        | | SECOND IGNITION|green               |+ |ignition harness *1        | |        ACCESSORY|orange              |+ |ignition harness *1        | | SECOND ACCESSORY|brown *7            |+ |ignition harness *1        | |       POWER LOCK|ORANGE / black        |*2 |gray 24-pin plug @ BCM *3   | |     POWER UNLOCK|same wire as lock   |- |gray 24-pin plug @ BCM *3   | |       LOCK MOTOR|*4                  |   |                            | |     UNLOCK MOTOR|*4                  |   |                            | |    DISARM DEFEAT|*4                  |   |                            | | PARKING LIGHTS +|do NOT use          |   |                            | | PARKING LIGHTS -|white *8            |   |pink 24-pin plug @ BCM *3   | |       HEADLIGHTS|yellow              |- |gray 24-pin plug @ BCM *3   | |     DOOR TRIGGER|*5                  |- |gray 16-pin plug @ BCM *3   | | DOME SUPERVISION|use door trigger    |   |                            | | TRUNK/HATCH PIN|RED / black           |- |gray 24-pin plug @ BCM *3   | |TRNK/HTCH RELEASE|black               |- |release switch              | |FCTRY ALRM DISARM|lt green            |- |gray 16-pin plug @ BCM *3   | |       TACHOMETER|white               |   |ignition coil               | |      SPEED SENSE|green               |   |gray 16-pin plug @ BCM *3   | |       BRAKE WIRE|white               |+ |brake switch               | |     HORN TRIGGER|black *6            |- |steering column             | |           WIPERS|                    |   |                            | | LF WINDOW UP/DN|blue - brown        |A |drivers window switch       | | RF WINDOW UP/DN|lt. blu - tan       |A |drivers door harness        | | LR WINDOW UP/DN|green - purple      |A |drivers door harness        | | RR WINDOW UP/DN|lt. grn - purple    |A |drivers door harness        | | SUN RF OPN/CLOSE|                    |   |                            | |   SUN ROOF LIMIT|                    |   |                            | Notes: NOTE: This vehicle has the passlock II immobilizer system that, when adding a remote start, must be interfaced with. Use DEI part 555t or 555L. *1 The ignition harness is located far right of the steering column, behind the ignition switch. *2 Lock and unlock use the same wire. Lock requires a negative trigger with a 470 ohm resistor in-line. Unlock is negative trigger. Must use relays.    *3 The BCM is located above the brake pedal. It is a plastic box with three plugs that face the firewall. *4 Installation of factory keyless upgrade alarm is not recommended on this vehicle because the door lock motor wires rest at approximately 7 volts. *5 The drivers door trigger wire is blue. Blue/white will catch all other doors. Use both wires and diode isolate each. *6 Horn can also be found at the black plug with a blue insert above the gas pedal. *7 This wire must be powered as an accessory wire. If powered as an 2nd ignition the car will not crank. *8 Must isolate this wire from the BCM when doing remote start to avoid 'service engine soon' light. See directfax document #1600 for wiring information.

great, thanks for the help.  Could you also tell me how to open up the dashboard to remove the deck, how to remove the door panels to remove the speakers?  Thanks again