DTC C1380-7E: Stop Lamp Relay Actuator Stuck On [12/2023 - ]: Description

When any of the following conditions are met, the No. 2 skid control ECU (brake actuator assembly) sets the drive output (STPO) ON which operates the stop light control relay (No. 2 semiconductor power integration ECU) and turns on the stop lights.

Illumination Conditions:

Pre-collision brake is operating.
The dynamic radar cruise control system is operating and is applying the brakes.
Secondary collision brake is operating.
Brake hold is operating.
The parking brake is engaged while the vehicle is being driven.
Advanced park is operating
Advanced drive is operating*
1. *: w/ Advanced Driver Assistance System

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from	Priority	Note
C1380-7E	Stop Lamp Relay Actuator Stuck On	w/ Front LiDAR Sensor: When the IG1 terminal voltage exceeds 10 V and the +BS terminal voltage is 9.5 V or higher, stop light drive output (STPO) is OFF, STP is OFF and STP2 is ON continuously for 5 seconds or more. w/o Front LiDAR Sensor: When the IG1 terminal voltage exceeds 10 V and the +BS terminal voltage is 9.5 V or higher, stop light drive output (STPO) is OFF, STP2 is OFF and STP is ON continuously for 5 seconds or more.	Wire harness and connector Stop light switch assembly No. 2 skid control ECU (brake actuator assembly) No. 2 semiconductor power integration ECU* STP circuit STP2 circuit	Brake/EPB	B	Output ECU: No. 2 skid control ECU (brake actuator assembly)

*: w/ Front LiDAR Sensor