If you have a black key, no transponder.....if you have a gray key, you DO have a transponder. You can bury a spare key into a DEI 555U....or if you don't want to give up any of your keys, get the DEI 555C.
And the locks are not negative trigger. It's a one wire system, and you use negative through a certain size resistor, depending on if you want to lock or unlock.
This sheet is for a 2002, but a 2003 is probably the same or similar:
| ITEM | WIRE COLOR |POL| WIRE LOCATION |
| 12V|red & pink/black |+ |ignition harness |
| STARTER|yellow |+ |ignition harness |
| IGNITION|RED / blue |+ |ignition harness |
| ACCESSORY|BLACK/ orange |+ |ignition harness |
| SECOND ACCESSORY|BLACK/ white |+ |ignition harness |
| POWER LOCK|pink/purple *1 |- |back of fusebox *2 |
| POWER UNLOCK|same wire | | |
| LOCK MOTOR|ORANGE / black | |back of fusebox *2 |
| UNLOCK MOTOR|pink/black | |back of fusebox *2 |
| DISARM DEFEAT|ORANGE / purple | |back of fusebox *2 |
| PARKING LIGHTS +|DO NOT USE | | |
| PARKING LIGHTS -|lt. GREEN/ orange *3 | |headlight switch |
| HEADLIGHTS|same wire *3 | | |
| DOOR TRIGGER|*4 |- |right of st column,blue plug|
| DOME SUPERVISION|use door trigger | | |
| TRUNK/HATCH PIN|tan/black *7 |- |conn. 1, pin 7 @ BCM *6 |
| HOOD PIN|BROWN / tan |- |conn. 1, pin 6 @ BCM *6 |
|TRNK/HTCH RELEASE|ORANGE / pink |- |conn. 1, pin 17 @ BCM *6 |
| FCTRY ALARM ARM| | | |
|FCTRY ALRM DISARM|lt. GREEN/ orange *5 |- |conn. 2, pin 9 @ BCM *6 |
| TACHOMETER|NOT grn/or or or/grn| |ign coil, coil pac, injector|
| SPEED SENSE|lt GREEN/ YELLOW | |conn. 1, pin 20 @ BCM *6 |
| BRAKE WIRE|WHITE/ tan |+ |brake pedal switch |
| HORN TRIGGER|BLACK/ red |- |steering column |
| WIPERS|brn/wht(L),rd/yel(H)|+ |wiper motor |
| LF WINDOW UP/DN|lt blue - white |A |center console window switch|
| RF WINDOW UP/DN|brown - pur/wht |A |center console window switch|
| LR WINDOW UP/DN|RED / blk - blu/wht |A |center console window switch|
| RR WINDOW UP/DN|grn/wht - gry/blk |A |center console window switch|
| SUN RF OPN/CLOSE|not recommended | | |
| RADIO 12V|pink |+ |radio |
| RADIO GROUND|black |- |radio |
| RADIO SWITCH|ORANGE / red |+ |radio |
| RADIO ILLUMINATE|orange (dimmer) |+ |radio |
| LF SPEAKER|green - brn/red | |radio *8 |
| RF SPEAKER|purple - blu/red | |radio *8 |
| LR SPEAKER|brn/yel - brn/lt blu| |radio *8 |
| RR SPEAKER|blu/wht - blu/org | |radio *8 |
Notes:
Note : Jeep vehicles that use a gray ignition key have an immobilizer system that needs to be bypassed when remote starting. Use DEI part number 555U. *1 Lock is negative trigger thru a 1.4K ohm resistor and unlock is negative trigger thru a 426 ohm resistor. MUST use relays. *2 In the top left corner in a black plug. *3 Parking lights is negative trigger thru a 910 ohm resistor. Headlights is negative trigger thru a 349 ohm resistor. MUST use relays. *4 The driver door trigger is tan and the passenger door trigger is tan/white, use both wires and diode isolate each. *5 The factory alarm disarm is negative trigger thru a 473 ohm resistor. MUST use relay. *6 The BCM (Body Control Module) is attached to the left of the fusebox. Connector 1 is a gray 26 pin plug, and connector 2 is a gray 22 pin plug. *7 The flip up glass pin switch is yellow/white in conn. 1, pin 9 of the BCM. *8 On vehicles with the premium sound system, each speaker is individually amplified.
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