You will need a bypass transponder in order for the remote start to work.
2003 Honda Accord
| ITEM | WIRE COLOR |POL| WIRE LOCATION |
| 12V|white |+ |ignition harness |
| STARTER|BLACK/ white |+ |ignition harness |
| IGNITION|BLACK / YELLOW |+ |ignition harness |
| ACCESSORY|BLACK/ red |+ |ignition harness |
| SECOND ACCESSORY|WHITE/ red |+ |ignition harness |
| POWER LOCK|pink/black *1 |- |grn plug, L side of fusebox |
| POWER UNLOCK|pink/blue *1 |- |grn plug, L side of fusebox |
| LOCK MOTOR|yellow/black |5wi|grn plug, front of fusebox |
| UNLOCK MOTOR|YELLOW /GREEN |5wi|grn plug, front of fusebox |
| DISARM DEFEAT|yellow |5wi|large wht plug above fusebox|
| PARKING LIGHTS +|RED / black | |large wht plug above fusebox|
| PARKING LIGHTS -|blk/red or blu/red | |in steering column cover |
| HEADLIGHTS|blk/red or blu/red |- |in steering column cover |
| DOOR TRIGGER|GREEN/ red |- |grn 5 pin plg behind fusebox|
| DOME SUPERVISION|use door trigger | | |
| TRUNK/HATCH PIN|blue/black |- |driver kick, harness to rear|
| HOOD PIN|yellow/red |- |hood pin switch in latch |
|TRNK/HTCH RELEASE|YELLOW /GREEN |+ |driver kick, harness to rear|
| FCTRY ALARM ARM|WHITE/ red |- |driver door module in door |
|FCTRY ALRM DISARM|white |- |driver door module in door |
| TACHOMETER|blue/red or blue | |ECM/PCM *2 |
| SPEED SENSE|blue/white | |ECM/PCM *3 |
| BRAKE WIRE|WHITE/ black |+ |brake pedal switch |
| HORN TRIGGER|GREEN/ YELLOW |- |steering column |
| WIPERS|blue (L), yellow (H)|- |windshield wiper motor |
| LF WINDOW UP/DN|RED / blk - RED / yel |A |LF window switch in door |
| RF WINDOW UP/DN|RED / blu - red |A |RF window switch in door |
| LR WINDOW UP/DN|RED / wht - blu/blk |A |LR window switch in door |
| RR WINDOW UP/DN|RED / wht - blu/blk |A |RR window switch in door |
| SUN RF OPN/CLOSE|grn/yel - grn/blk *4|A |moonroof motor, rear of roof|
| RADIO 12V|WHITE/ green |+ |radio |
| RADIO GROUND|black |- |radio |
| RADIO SWITCH|yellow/red |+ |radio |
| RADIO ILLUMINATE|RED / black |+ |radio |
| POWER ANTENNA|YELLOW /GREEN |+ |radio |
| LF SPEAKER|grn/blk - lt. green | |radio |
| RF SPEAKER|grn/yl - gry, gry/rd| |radio |
| LR SPEAKER|blu/wht - blu/blk | |radio |
| RR SPEAKER|pink - blu/yel | |radio |
Notes:
NOTE: This vehicle has an immobilizer system that needs to be bypassed when adding remote start. Use DEI part number 555U. *1 These wires will meter when using the passenger door lock switch. *2 The ECM/PCM is on the front of the transmission tunnel. The connectors are on the passenger side. On the 4 cylinder models the tach wire is in the white 31 pin connector E, pin 25. On the 6 cylinder models it is in the gray connector A, pin 23. *3 The ECM/PCM is on the front of the transmission tunnel. The connectors are on the passenger side. On the 4 cylinder models the VSS wire is in the white 31 pin connector E, pin 26. On the 6 cylinder models it is in the gray connector A, pin 11. *4 This is only on the sedans. On the coupes the moonroof motor is integrated into the moonroof control unit not allowing access to the motor wires.
Be careful whose advice you buy, but be patient with those who supply it.