13 Cascadia Utility light diagram

For anyone to want to begin assisting you, you need last 6 of vin.

 

So this unit is in fact equipped with a Utility Lamp switch and parameter from factory. The MSF commands the SAMCAB to turn on CIRC 73A through the 19 pin deutsch pass-through connector on bulkhead.

That is located on the RHS firewall labeled as BHD_1B:


Pins 19 and 3 for CIRC 73A and GND respectively.



Which then connects to this 6 pin connector for pins 1 and 2:



Located here right next to your wiper motor:



Which then connects to a "CUSTOMER ACCESS CONNECTOR" 2 pin:



Now this is where it gets tricky as I cannot pinpoint where the EXACT location is of the two-pin connector because it is an optional commodity. I would suggest looking for the inside frame rail towards the rear. You are looking for PURPLE-WHITE stripe wire with a black GND.

The BOM has listed for "LAMP-EXTERIOR, UTILITY." Do you have lamps on the side of the lower fairing? The arrow on your picture, is there not a light back there on BOC?

At any rate, here are some wiring drawings none the less--please smash that thanks button.

 

BOOM! That's it! Looks like it is customer supplied after that point. Where did you find that? I'm curious myself...in the frame rail?

 

If you want to confirm that 73A circuit, you can lift the hood and on the left side of the firewall, you'll see that 6 pin connector right by the wiper motor that should also have the PURPLE-WHITE stripe wire in cavity 2.

 

Where did you find this? I’m trying to get my utility lamps working on my 2016 Freightliner. I changed the bulbs and that’s not issue. If you have any info on this please help. Thank you