2002 Chevrolet Suburban, Excalibur AL-2075-3DB-L

Hello, first post but I need some advice from any installers that are familiar with this vehicle and alarm system. I did the install this weekend. I used the Omegalink OL-BLADE-TB bypass. Everything is working now except for the door locks and horn honk. I used the green and blue wires from the door lock harness on the Excalibur and tied them in to the light blue and white wires in the brown BCM plug. I know I got the right wires because this truck previously had a remote start on it that failed. Everything is working now except the door locks. Do I need to use relays with this alarm? Also, does anyone know if the door triggers on this vehicle are - or +, and will I need to use diodes?

Thanks in advance
Thom

Issue #1 - Door Locks

That vehicle needs a (+) Lock and Unlock signal. Your Excalibur system only outputs (-) door lock signals. You can either use relays to make the (-) to (+) conversion or get a Directed 451M Door Lock Module for ~$10. The 451M install guide is in the Downloads Section.

Issue #2 - Horn Honk

That vehicle needs to see a (-) Horn Honk input. Your Excalibur system has to be wired to output a (-) Horn Honk output. To achieve this connect the Violet/Black wire of the 18 Pin connector to Chassis Ground and connect the Blue/Black wire to the vehicles' Black Horn wire. The Brown/Black wire is not used for your application.

Issue #3 - Door Trigger wires

The door trigger wires are (-) and you will need diodes ( 1N4001 ) to combine them as one input for the Excalibur. In that vehicle there should be three wires at the BCM that will give you the Drivers Front, Passenger Front and both rear doors. This is info from Omega :
TAN (Dr) & LT GRN/BLK (PS), DK BLUE (PS&DR) REAR DOORS
PINK/BLACK REAR DOORS At BCM Under Steering Column

Another source gives this info with only two trigger wires needed to cover all 4 doors :
Left Front Door Trigger........tan (-)..................@ BCM under driver dash, purple plug, pin B4     
Right Front Door Trigger*.......dark blue/white (-).....@ BCM under driver dash, lt. blue plug, pin B11
* This wire provides the rear doors also.

I would use a DMM and test these wires while opening each door.

Extra Note : Don't forget to power the White IGN2 wire during R/S to prevent transmission damage.

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Soldering is fun!

Thanks for all the above. I had a couple Bosch relays lying around, so I used them for the doors. I snagged an Adiovox diode off of Amazon and got the door triggers working with the 2 wires at the BCM. So the horn was the last puzzle, you solved it for me.TY!!!