window module wiring, 98 chevy crew cab

Okay, I have done a little research and I think I have come up with the right way to wire in priority locking and it would be great if someone could give me a yah or nah and if a nah a little help would be greatly appreciated.  Here is a diagrahm of what I think I need to do.  From what I can tell my truck sends a positve to lock the doors a negative to unlock drivers door but a positive for 2nd unlock.  The clifford 590.2x alarm has 2 negative door lock outputs so I am using a DEI 451m doorlock relay module.

Also I have a couple of other quick questions.  Is it recommended to install a diode when tapping into a (+) 12 volts constant to power a module, relay or other device.  For example I tapped into the the constant 12 volts at the headlight switch to power a relay for domelight supervision and will probably do the same for the tilt sensor.  I am mounting the tilt sensor on a flat level spot behind the dash bezel.  And, what about installing a diode for a (-) door trigger when the same wire is being used for the domelight supervision.

Thank you

Rod

If  using the door trigger wire as the dome trigger as well, a diode normlly isn't necessary (know i never used one), also no diode at the 12volts supply for the relay, however i would reccomend connecting it to a better source like say the ignition harness, is it possible to have two different signals controlling the door locking system?, i've never seen that before, i won't reply to that unless someone else confirms this!

Hey T&T thanks for your reply.  I think your right about the two signals thing I think I misread or wrote my notes down when I was working on it but I will recheck again when it stops raining.  The only reason I tapped into the head light switch power was because it is a 10awg wire and the tilt sensor uses less than 1 amp and a domelight supervision relay probably uses even less than that plus neither is in operation when the vehicle is in use or on at the same time so I figured no harm and I don't have to run wire every where.  Do you think it could cause any problems?  Should I change it?