2006 Volvo VNL Turn Signal Wiring Diagram

I am trying to figure out why the turn signals on this tractor are completely dead with no input power to the control/turn signal switch at any pin. I know that the power goes through a light control module to get there but none of the diagrams that have already been posted show this output of the module. I don't have any code reader for this system, so I only have the ability to use a diagram to trace the power (or lack thereof). Thanks for any help.

 

The hazard switch is functional. The multifunction switch has no power going to it, which is why it is not working. I don't think replacing either switch will do it.

 

Yes. I checked all the fuses and there are no relays in this particular part of the system. There's a dead short on F14 (Qualcomm) but all the other fuses are good. I pulled the wiring diagram, and F14 doesn't come near the lighting system anywhere. Reading the diagram it looks like these wires go to three places - a common ground splice, the ECM and the LCM. I have no power to the switch, but I'm about to go try and activate the switch and see if I get output anyway because maybe it doesn't have a constant the way lights that don't use modules do.

 

Yeah - the turn/highbeam/cruise switch is properly controlling the highbeams, but the regular head and tails aren't coming on. The turn signals aren't coming on, but the flashers are using the headlight/flasher switch. The driver didn't complain about the cruise control not working (I wish I had an A right now and could drive this myself to check it, but I can't). That fairly well eliminates the switch, and according to the diagram all paths lead back to the LCM because the common ground would impact everything and the only impacted functions are those that lead back to the LCM as this is also where the head and tails respond...reprogram?

I really wish they had a manual trouble tree for this, like the older ones where you could check module voltage, power, ground, etc and it actually told you what to read at each pin. These are just awful without a scanner.