The schematic indicates the taillights are not linked to the BCM.
You are not getting powwer to the lights.
I would suggest starting by checking the power supply to the switch and out put to the taillights.
At the light switch, check for battery voltage to Orange wire. It should be hot at all times.
If power is available, turn on lights and Brown wire should have battery voltage. If it does not, the switch is bad. If brown wire has bettery voltae, check the wiring connections between switch and bulbs.
Are the interior illumination lights working, eg, for switches etc?
Thursday, March 15th, 2012 AT 3:02 PM