Medium and Heavy Trucks
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Hi my name is***** will be glad to help. Sht Lo 249s254 04 means there is a fault in the Cab SAM controller circuit. Check for interior light bulbs out, blow fuses, inop heated mirrors, etc. I will look into the second code you posted and get back to you. Let me know what you find in the meantime.
conn X12, pin 6
Reading lamp 1, zone 9
– Voltage below normal,
or shorted to low
This means you have a reading light out in the sleeper.