on 1998 jeep grand cherokee with rem

Hi I have A 1998 Jeep Grand Cherokee Limited And I just Installed a Viper 7900 With DEI 455 Interferance Module To The Jeep It Arms And Unlocks with The Factory Alarm Nicely But Here is THe Thing I arm the Car And THen I try To remote start it and what I see The Factory Alarm gets unarm by the signal Interference module is sending but It would not start so What it Does It Cranks but Doesnt start for 3 times. Do You have any Suggestions I will Appreciate for your help... Im Using This Digram: Make:   Jeep Model: Grand Cherokee Year:    1998 Alarm Constant 12 volts RED / WHITE (2) IGNITION SWITCH HARNESS Ignition 12 volts D BLUE/GRAY IGNITION SWITCH HARNESS Starter YELLOW IGNITION SWITCH HARNESS Dome Light YELLOW (-) AT COURTESY LIGHT Trunk Pin Switch TAN/BLACK (-) AT BODY CONTROL MODULE * Parking Lamp D BLUE/RED (+) AT HEADLIGHT SWITCH Power Lock D\ ORANGE / VIOLET P\ BLACK/ WHITE ** #229 Power Unlock R/ PINK/BLACK S/ PINK/BLACK * Body Control Module (BCM) Is Located Behind Driver Dash. ** This Car Uses A Data Link Circuit For Power Door Locks. Wires At Switch In Driver Door Operate Driver Door Only, Wires At Switch In Passenger Door Will Operate All Other Doors. Wires Must Be Accessed At Switches In Each Door And Wired As Reversal Rest At Ground. #229 - See 1996 Jeep Grand Cherokee Door Lock Diagram. View Diagrams Accessories Window Up D\ L BLUE P\ BROWN D\ PNK/BLK P\ GRN/WHT * SEE Window Down F/ WHITE F/ VIOLET R/ RED / BLK R/ GRY/BLK NOTES Ign Key Warn L BLUE (-) IGNITION SWITCH HARNESS Trunk Release N/A OEM Horn GRAY/ORANGE (-) STEERING COLUMN HARNESS Headlights TAN/BLACK (+) AT HEADLIGHT SWITCH OEM Alarm Arm N/A PASSIVELY ARMING SYSTEM ** OEM Alarm Disarm VIOLET / YELLOW (-) DRIVER KICK PANEL OR AT BCM * CAUTION!! This Vehicle Uses A Data Link Circuit For Power Windows. Colors Listed For The Driver Front Are Located At Switch In Driver Front Door. Colors Listed For Other Doors Are Located At Switches In Each Door. For Front Windows, See Note #211 - Reversal Rest At Ground Circuit, For Rear Windows See Note #212 - Reversal Rest At Positive Circuit. ** OEM Alarm Arms Passively Or Thru OEM Transmitter. View Diagrams Remote Start Tach Signal GRAY/WHITE AT IGNITION COIL OR PCM * Ignition #2 BLACK/ ORANGE IGNITION SWITCH HARNESS Ignition #3 N/A Accessory RED / BLACK IGNITION SWITCH HARNESS Neutral Safety BLACK/ WHITE (-) AT SWITCH ONTRANSMISSION OR AT PCM * Brake Light WHITE/ TAN (+) AT SWITCH ABOVE BRAKE PEDAL Reverse Light BROWN / L GREEN (+) AT SWITCH ON TRANSMISSION Rear Window Defrost D BLUE / YELLOW (-) AT REAR WINDOW DEFOGGER SWITCH * Powertrain Control Module (PCM) Is Located On Passenger Rear Of Engine CompartmentArthur I. Linares

The ignition keys on that Jeep are gray, right? What are you using to interface with the car's Sentry Key immobilizer key system. The 455J does the doorlocks, and turns off the factory alarm during remote start. But you still need something (like a 555C) to emulate the Sentry Key.

I Have The DEI 455TW Interference, Any Suggestions Just Cranks But like it wants to start then it pauses and repeats itself 3 times. Then After I hooked up the Tach I can hear the alarm over cranking. My Key Is Black Not Gray..Arthur I. Linares

Your tach is most likely not programmed properly; or it's also possible that you don't have the correct ignition wire connected. Try reprogramming the tach wire(you'll know it's programmed allright when the LED comes on). If the tach doesn't program, try moving it to the uncommon wire at any fuel injector - I've had issues with using the ignition coil on Grand Cherokees for my tach source. Chris Luongo, I don't believe they started Sentry Key on the JGC until '99C Renner's Auto Electronix

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Yeah, Chris, you're right. Now I remember that they redesigned them in 1999. Arthur, Somewhere in the programming menu is "shutdown diagnostics" or something like that. Anyway, turn on the remote start, and let it do its thing. Let it try (and fail) three times, and then it'll give up. After that, go into that menu, and the diagnostics feature should tell you the reason it failed to start. I also agree with Chris, that if you haven't done so already, program the tach signal to the remote starter. Just like he said, if it programs, you are probably on the right wire.