DTC U1177-87: Lost Communication with Side Obstacle Detection Control Module "A" (ch2) Missing Message; DTC U1178-87: Lost Communication with Side Obstacle Detection Control Module "B" (ch2) Missing Message [12/2019 - 11/2023]: Description

This DTC is output when the clearance warning ECU assembly detects lost communication with the blind spot monitor sensor.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
U1177-87	Lost Communication with Side Obstacle Detection Control Module "A" (ch2) Missing Message	The clearance warning ECU assembly is unable to receive communication from the blind spot monitor sensor RH (A)	Open or short in bus main line Open or short in bus branch line Open or short in wire harness connector (No. 22 CAN junction connector) Clearance warning ECU assembly internal malfunction Blind spot monitor sensor RH (A) internal malfunction Blind spot monitor sensor RH (A) power source circuit malfunction Blind spot monitor sensor RH (A) internal malfunction
U1178-87	Lost Communication with Side Obstacle Detection Control Module "B" (ch2) Missing Message	The clearance warning ECU assembly is unable to receive communication from the blind spot monitor sensor LH (B)	Open or short in bus main line Open or short in bus branch line Open or short in wire harness connector (No. 22 CAN junction connector) Clearance warning ECU assembly internal malfunction Blind spot monitor sensor LH (B) internal malfunction Blind spot monitor sensor LH (B) power source circuit malfunction Blind spot monitor sensor LH (B) internal malfunction