Welcome to JA,
How did you determine the multifunction switch is good?
It sounds like the body control module is bad. You will need to test the dark green and red wire at the BCM c2 connector for output to the lamps, your test light should flash.
Also use a test light at fuse 14 under the hood and fuse 12 under the dash. The body control module is located to the left of the steering column. Here is a diagram for you.
I hope this helps if so an accept is appreciated.
Hello TSanford, I have seen this before. push the hazzard switch and then try your turn signals. What I have seen before is the hazzard flasher is bad therefore when hazzard switch is on, nothing happens including the turn signals wont work. So if by pushing your hazzard switch and then trying your turn signals they should work, if so replace the hazzard flasher.
You have somthing called a combination flasher which works both turn signals and hazzards, I guess DT did not read your first post.
Pin 7 at the connector is blue and is your Fused ignition switch output if you do not have power to this wire with the key on, that is your problem.
Pin #8 is the ground circuit.
Is there anyway you can swap BCM's with your brother in laws van.