2001-2002 Grand Am Radio Wiring

if anyone has information or anywhere I can find info on wiring shemes for installing an aftermarket head unit. Is there an antenna adapter needed for grand ams?? or can it be bypassed?? any info would be helpful, thanks

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need help about everything

Yes , an Antenna Adapter is needed

|        RADIO 12V|orange              |+ |at radio                    |
|     RADIO GROUND|                    |   |                            |
|     RADIO SWITCH|yellow              |+ |at radio                    |
| RADIO ILLUMINATE|                    |   |                            |
|    POWER ANTENNA|dk. green           |   |at radio                    |
|       LF SPEAKER|tan - gray          |   |at radio or LF speaker      |
|       RF SPEAKER|lt. grn - dk. grn   |   |at radio or RF speaker      |
|       LR SPEAKER|brown - yellow      |   |at radio or LR speaker      |
|       RR SPEAKER|dk. blu - lt. blu   |   |at radio or RR speaker      |


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 Remove the radio, without unplugging it, to access the ignition harness. *2 Lock requires a negative trigger, and unlock requires a negative trigger through a 1,500 ohm resistor. Must use relays. Must close doors to lock with a single pulse. *3 Requires a high current ground. Use a relay. *4 The lt. GREEN/ black is located in the drivers kick and catches only the drivers door. The lt. blue is located in the harness coming from the drivers running board going under the drivers seat and it catches all other doors. Use both door trigger wires and diode isolate each. On the 2 door the lt.blue is in the passenger kick.    *5 The ECM is located under the left side of the dash to the left of the column.