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?

Answered by KHLow2008 (expert)
39,834 answers provided

Hello again and thanks for your help, I've checked for power on the orange conductor at the switch and found none. I've re-checked the fuses and all are ok.

Response from Jaksun
2 questions asked

And yes the dime lights are all working as well.

Response from Jaksun
2 questions asked

I just found the problem. The ground in the body fuse block was totally corroded looks almost like someone spilled something on the fuse block. Cleaned the ground with a wire brush and bang went the relay.
Thanks again for your help. Much appreciated.

Response from Jaksun
2 questions asked

You're welcome. Glad to know you have fixed the problem.

Have a nice day.

Answered by KHLow2008 (expert)
39,834 answers provided