DTC C1380: Stop Light Control Relay Malfunction [10/2020 - 10/2023]: Description

When the brake hold system or dynamic radar cruise control system operates, the skid control ECU assembly turns ON the stop light drive output (STPO) to operate the No. 3 semiconductor power integration ECU and illuminate the stop light.

DTC No.	Detection Item	INF Code	DTC Detection Condition	Trouble Area	MIL	Note
C1380	Stop Light Control Relay Malfunction	391 392	INF Code: 391 When the voltage at the +BI1 and +BI2 terminal is 8.9 V or more and the stop light drive output (STPO) is ON, STP2 OFF condition continues for 2 seconds or more. INF Code: 392 When the voltage at the +BI1 and +BI2 terminal is 8.9 V or more and the stop light drive output (STPO) is OFF, both STP OFF and STP2 ON conditions continue for 2 seconds or more.	Wire harness and connector No. 3 semiconductor power integration ECU Skid control ECU assembly	Does not come on	-