RS on 1991 buick lasabre. passlock?

I am doing an install on my grandmothers 1991 or 92 buick lasabre. Do I need any type of bypass? It has the chip in the key. THanks. I looked under the  wiring info and it did not say. I am installing a crimestopper  900V. THanks. Barnsy

From my diagrams, it looks like th 1991 model does not, but the 1992 has a VATS resistor based security system. The "chip" in this case is actually a resistor. You will have to override that with a bypass module or with a resistor & relay.Good Enough Isn't!

Here is what DEI lists: DIRECTWIRE™ WIRING INFORMATION - BUICK / LESABRE / 1992 / Remote Start [PRINT THIS PAGE] 12volts      red       +       ignition harness Starter      yellow       +       ignition harness Second Starter                  Ignition      pink       +       ignition harness Second Ignition                  Third Ignition                  Accessory      orange       +       ignition harness Second Accessory                  Keysense                  Power Lock      lt. blue       +       either kick panel Power Unlock      black       +       either kick panel Lock Motor      gray             drivers door harness Unlock Motor      BLACK/ lt. green             drivers door harness Parking Lights+      brown             low in drivers kick Notes: Also found at the lighting control module. The lighting control module is located to the left of steering column. Parking Lights-      dk. blue             light switch Hazards                  Turn Signal(L)                  Turn Signal(R)                  Reverse Light                  Door Trigger      white       -       under dash light Dome Supervision      use door trigger             Trunk/Hatch Pin      black       -       at switch or light Notes: Not available on all models. Hood Pin                  Trunk/Hatch Release      lt. blue or blk/wht       +       at release switch Power Sliding Door                  Factory Alarm Arm      yellow       -       drivers door harness Notes: Not available on all models. Factory Alarm Disarm      lt. green       -       drivers door harness Disarm No Unlock                  Tachometer      PURPLE / white       AC       ignition module Notes: May also be found white at the instrument cluster on models with a tachometer. Wait to start                  Brake Wire      lt. blue       +       brake switch Parking Brake                  Horn Trigger      black       -       steering column Memory Seat 1                  Memory Seat 2                  Memory Seat 3                  Interface Module:      Category: Immobilizer Bypass      Required: Yes      Type: VATS Part #: 652T resistor pack Alternate Part1 #: DesignTech 20402 Alternate Part2 #: DesignTech 29402 Notes: See DirectFax document 1049 for interface information. Smart Starter Kill Relays: Not Available warning       This wiring information is being provided free of charge on an "as is" basis, without any representation or warranty. It is your responsibility to verify any circuit before interfacing with it using a digital multimeter. Directed Electronics assumes no responsibility with regards to the accuracy or currency of this information. Proper installation in every case is and remains the responsibility of the installer. DEI assumes no liability or responsibility resulting from improper installation, even in reliance upon this information. Here is a link that explains how to bypass VATS.