DTC C1380: Stop Light Relay Malfunction [09/2018 - ]: 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.

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DTC No.	Detection Item	INF Code	DTC Detection Condition	Trouble Area	Note
C1380	Stop Light Relay Malfunction	391 392	INF Code: 391 When the voltage at the +BI1 and +BI2 terminal is 8.9 V or higher 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 higher 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	-

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

Note

C1380

Stop Light Relay Malfunction

391
392

INF Code: 391
- When the voltage at the +BI1 and +BI2 terminal is 8.9 V or higher 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 higher 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