2006 Montana SV6 front wipers and washers stopped working. Found that they only work when the tilt steering column is in the highest position. Thinking a broken wire from multi-switch. Anyone know what colour wires I will be looking for, is there any issues with airbag wires if I am working in the steering column?

SOURCE: windshield wiper switch

The only other part that could be the problem with the winshield wipers not working in slow-mode or not park when you shut off the wiper switch is the winshield wiper motor, it has a park swith inside the motor to shut off the wipers and park them were they should be.

SOURCE: 2000 Jeep Cherokee Windshield Washer

You have a motor for the front and rear washer. Check the fuses. If the intermitted wipers does not work, there is a relay under the dash near the steering colum that needs to be replaced.

SOURCE: real right turn signal light - Pontiac Montana SV6 2005

If the 2005 Montana is similar to the 2001 Montana, I have a solution. First you'll need a hexagonal wrench (the 6-sided L-shaped wrench). The tail light assembly is held on by two screws. You'll need the hexagonal wrench to remove them, because a normal screwdriver won't do it. I also had to use a conventional adjustable wrench to get the leverage to turn the hexagonal wrench, because the screws were in there pretty tight. Once you remove the two screws, the whole tail light assembly should come off. Mine required a little force and I had to play with it a bit, but it came off without a lot of work. There will be one set of wires that connects the tail light assembly to the rest of the minivan--try not to damage that set of wires. Once you get the tail light assembly off, you'll have to take apart the assembly that actually holds the lights. No tools should be required. It's held on by four plastic catches. Just undo the catches (easier said than done, but still not too tough) and it comes apart. Then you can pop out the old light and pop in the new light. Then re-assemble. For me, it went back together much easier than it came apart.

SOURCE: L.F. heated seat does not work 2005 Pontiac Montana SV6

element in the seat is burned out remove the cover and you will see a burn spot in the element

SOURCE: 2005 Pontiac SV6 Montana key fob unlocks doors but will not lock

For the sliding doors you need to clean the contacts, there are 6 or 8 on both sides, just wipe them clean as they are probably covered in oil/grease/grime.