relay question-momentary to constant

I have been working (unsuccessfully) with the above setup, using the unlock pulse from my remote to turn on the courtesy and backup lights in my Tacoma.  I added a third relay to break contact between 85 and 87 using the door trigger to open the 87a-30 contacts.  That way  the lights come on with the unlock pulse and then go off when the door is opened (except courtesy lights stay on until door is shut).  Here are my questions.

#1 I had to add a fourth relay to convert the positive output to negative output.

Is there a way to do 'momentary to constant negative output' with fewer relays?

Also, when I add the 4th relay, I get problems with the latching not working.  I need diodes added I'm sure but don't know where. 

Could someone illustrate where the diodes go and maybe set up a diagram as I've tried to create?  THANK YOU!!!  :)

Make the unlock pulse trigger a latch IC with the output going to a transistor which goes to a relay to the light switch(es). Connect another relay that is controlled by the door signal so that when the door is opened, the latch gets reset to off.

Okay, my last post did go through, even though the board said it didn't 'cause I was spamming (BS)

I built a circuit a while back to do this job, Here is my best rendering.

This should cost about 15 bucks to make and uses none or 1 relay, depending on the lights being driven. Hope this helps, good luck. Tim