viper 5301, 2009 corolla

The horn honk is a simple wire connection if the Viper has a horn output(usually brown). As for the drfrost and trunk you will need to wire relays for each...Mike M2

Tech Manager

CS Dealer Services

I can understand that the defroster is a somewhat-unusual feature that not every customer wants to pay for.......but if they didn't even try to sell you on the trunk release, that's just lazy. Anyway: Trunk release: Pink wire, in a plug low in driver's kick panel. Ordinary SPDT automotive relay required. It's a "5-wire" or "reversing polarity" type setup....you have to cut the car's pink wire and connect both ends to the relay. There should be more information in the "relays" section on this site. The Viper system should have a RED / white, low-current trunk release output to activate the relay. Rear Defrost: Don't know the color or location, but I hooked it up in a Camry once. Along the driver's doorsill, test any of the large wires there in the harness running to the back of the car for positive power when the defroster is on. On the Camry I did, the defroster wire was "5-wire" style as well, and needed to be cut in half and connected to the relay. The Viper system should have a defroster output, but I have no idea what color it is. Horn: Simple hookup, no relay required. Snap off shroud around steering column. (Have car's interior fully warmed up; plastic panels are brittle when cold.) Behind the steering wheel are two plugs: One is yellow and has the airbag wires; avoid it. The other plug only has a few wires....one of those will test as ground when honking the horn. I can't remember the horn-honk wire color for the Viper (brown?), but it can be connected straight to the Corolla's horn wire, with no relay required. If your 5301 is an alarm/starter combo, the horn output is going to be off by default. You'll need to go into the Viper's programming menu and turn the horn honk feature on. Install guide: No idea; but maybe someone else here will have a link for it online. Good luck!

Pretty much what Chris said, only I have one addition. If you do it yourself you will void your warranty. If anything goes wrong and you try to bring it back to any Best Buy, they will charge you for the time it took them to troubleshoot it. So $30-40 now is not that much compared to $80 dollars later.

Chris as usual is quite correct and I totally agree with the trunk wire comments. RED / white from alarm to relay 85, 15amp fused constant to 86 and 87. switch side of cut wire to 87a and relase (trunk) side of cut wire to 30. same wiring layout for the rear defroster.