I got this wiring info for a 2002 Grand Am and as far as I know it's the same as a 2003, which is the same as a 2004, correct me if i'm wrong: (see below dotted line)
Question is about the double iginition wires. Would i simply tap both and tie into the single wire going to alarm brain? would i have to diode isolate both and then tie into the single wire for the alarm....if i helps, i'm not using a starter kill - I don't want to mess with the passlock system.
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ITEM | WIRE COLOR |POL| WIRE LOCATION |
| 12V|red |+ |ignition harness *1 |
| STARTER|yellow |+ |ignition harness *1 |
| IGNITION|pink |+ |ignition harness *1 |
| SECOND IGNITION|dk. green |+ |ignition harness *1 |
| ACCESSORY|orange |+ |ignition harness *1 |
| SECOND ACCESSORY|brown |+ |ignition harness *1 |
| POWER LOCK|white |- |drivers kick panel in a black plug |
| POWER UNLOCK|same wire |*2 |
|
| LOCK MOTOR|gray | |drivers kick panel |
| UNLOCK MOTOR|tan | |drivers kick panel |
| DISARM DEFEAT|tan | |passenger kick panel |
| PARKING LIGHTS +|brown | |passenger kick or column |
| PARKING LIGHTS -| | | |
| HEADLIGHTS|dk. blue & pink |*3 |steering column |
| DOOR TRIGGER|*4 |- |*4 |
| DOME SUPERVISION|white |- |dash light or column |
| TRUNK/HATCH PIN|ORANGE / black |- |trunk light |
|TRNK/HTCH RELEASE|BLACK/ white |+ |drivers kick panel |
| TACHOMETER|white or PURPLE / wht | |ignition coil or ECM *5 |
| SPEED SENSE|dk.GREEN / WHITE | |ECM *5 |
| BRAKE WIRE|lt. blue |+ |at the switch |
| HORN TRIGGER|black |- |steering column |
| WIPERS|dk. grn & purple |+ |steering column |
| LF WINDOW UP/DN|dk. blue - gray |A |drivers door switch |
| RF WINDOW UP/DN|lt. blue - tan |A |drivers door switch or kick |
| LR WINDOW UP/DN|dk. green - pur/wht |A |drivers door switch or kick |
| RR WINDOW UP/DN|lt. green - purple |A |drivers door switch or kick |
| SUN RF OPN/CLOSE|blue - green |A |sunroof motor |
| SUN ROOF LIMIT| | | |
| 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.
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For an alarm u only need to use the primary ignition.
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Gary Kline
MECP Master Technician