FL6 in the 2010 RRS is used for the last 2 TDV8 glow plugs, with FL1, FL4 and FL5 for the other 6. I suspect the D4 2.7 might use FL1, FL4 and FL5 for its 6 glow-plugs.
The trailer symbol not illuminating is usually due to the globes not drawing sufficient current, often just differences between brands. My box trailer doesn't show but the van does, even though both have globes marked as 21W. Disabled reversing sensors is more indicative that the trailer is known to be attached.
AFAIK trailer stability assist is based on the vehicle's behaviour when it becomes characteristic of a being swayed by a trailer, not because a trailer is attached.
MY21.5 L405 D350 Vogue SE with 19s. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
VK2HFG and APRS W1 digi, RTK base station using LoRa
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