DTC Detection Logic

WARNING: This page is about a different car, the 2018 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

DTC No.	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
C1B55	RADAR BLOCKAGE (Radar blockage)	Diagnosis condition	When ignition switch is ON.
		Signal (terminal)	-
		Threshold	Side radar is blocked
		Diagnosis delay time	-

NOTE: DTC "C1B55" may be detected under the following conditions except for possible cause. (Explain to the customer about the difference between the contamination detection function and the indication when the malfunction is detected and tell them, "This is not malfunction")

The side radar may be blocked by temporary ambient conditions such as splashing water, mist or fog.
The blocked condition may also be caused by objects such as ice, frost or dirt obstructing the side radar.
Due to the nature of radar technology, it is possible to get a blockage warning and not actually be blocked. This is rare and is known as a false blockage warning. A false blocked condition either self-clears or clears after an ignition cycle.