So I've been trying to locate what fuse is connected to the fog light on my Cascadia 2009 truck. The fog lights won't turn on and I belive that it is becuase the fuse or relay broke or blew. I checked the manual and the diagram but it won't give me a specific pieace. Does anyone know what the name for the fuse or relay is called?
What is the fuse/relay for the fog lights (Cascadia 2009)
Discussion in 'Ask An Owner Operator' started by JBanuelos, Mar 6, 2021.
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There isn’t one. It’s powered directly from the SAM Chassis module. If you had access to Detroit Diagnostic Link it may show a code there for open circuit or short to ground. It could also be the switch.
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Detroit Diesel Diagnostic Link is the software program used to set parameters and do fault diagnosis for n Detroit engines and transmissions, plus Freightliner and WesternStar trucks.
Cost $500 per year subscription plus under $1,000 for the adapter to hook to a laptop.JBanuelos Thanks this. -
Just looked at the wiring diagrams. It is way more complicated.
The light switch sends a signal to the Multiplex System Field (MSF) switch. Its the assembly attached to the dash that contains the Four-Way-Flasher switch. That then sends a signal to the SAM cab controller which is located in the passenger firewall. Part of it is behinds the glove box, the other part extends out into the engine compartment. Then the SAM Cab sends the power directly to the fogs lights.
Seeing as both now quit: the most common cause is water intrusion into the SAM Cab controller due to a leaking windshield. This will cause corrosion in the wiring harness connectors that plug into the SAM Cab module.JBanuelos Thanks this. -
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That's nice the driver's manual was checked, but if more pertinent detail is needed...I need specific information.062 Thanks this.
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