2002 Impala Doorlocks

I've installed a remote start/alarm in my dad's 2002 Chevy Impala.  Everything works great except for the door "lock."  The "unlock" is fine.  I am tapping into the ORANGE / Black (-) trace wire at the BCM per Audiovox and DEI wiring and using the 480ohm resistor.  I am using 2 relays and both are wired..... 85-alarm input, 86-12V, 30-ground.  The "unlock relay" has pin 87 through a diode to the ORG/BLK.  The "lock" relay has pin 87 through a diode AND the 480ohm resistor to the ORG/BLK.  I have tried switching the places of the diode and resistor, but neither way worked.  I am also confident I have the diode connected properly, w/ the band closer to the relay.  Anybody have any experience w/ the Chevy single wire doorlocks???

On a side note, I'm glad I found this site!!!  I just joined today and I'm glad to see how helpful everyone is w/ problem solving.  Keep up the good work and thanks to the12volt.com admin.

Do not use diodes, just like stated before they will affect voltage and keep the locks from working properly.  I am installing a car start in a 2002 Impala today.  I have everything worked out, but the service engine soon light comes on because of the park lights.  Did you have this problem?

Thanks,

Steven

This service engine light soon was stated as a precaution in my wiring diagram from directed electronics.  It refers to a tech note to see how it is to be wired.  I didn't know if anyone else knew what the wiring would be.

Thanks,

Steven

Thanks for all of your input.  The diodes were not needed in this set up since the circuit was being isolated by the relays anyway.  But, as Murphy's Law would have it, I spent a 1/2 hour w/ Audiovox tech help to diagnose my "lock" problem.  It turns out I needed an 884 ohm relay, not a 480 !!!  Luckily the remote starter comes w/ a dozen or so resistors for the GM vats? and he had me go through all of them til we found one to lock the doors.

SHELBYDIS,   Here's what you need to do for the engine light, per Audiovox.  Connect the IGN2 wire from the starter module to the ORANGE Acc. wire of the vehicle.  You must set the IGN2 output to "Off During Crank."  Not sure what brand you're using, but Audiovox is selectable via features programming.  I then used the ACC wire from the starter module to the BROWN Acc. wire of the vehicle.