DTC C1380/64: Stop Light Control Relay Malfunction [08/2013 - ]: Description

WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.

Upon receiving the hill-start assist control operating signal from the skid control ECU (brake booster with master cylinder assembly), the relay contact turns on and the stop lights come on.

DTC No.	INF Code	DTC Detection Condition	Trouble Area
C1380/64	761	Either of the following is detected: When the stop light switch assembly input (STP) is ON and the No. 1 integration relay output (STP0) is ON, a signal is not input to the STP2 terminal for 2 seconds or more. When the stop light switch assembly input (STP) is OFF and the No. 1 integration relay output (STP0) is ON, a signal is not input to the STP2 terminal for 2 seconds or more.	Stop light switch assembly circuit No. 1 integration relay (Engine room junction block assembly) No. 1 integration relay circuit Skid control ECU (Brake booster with master cylinder assembly)
↑	762	When the stop light switch assembly input (STP) is OFF and the No. 1 integration relay output (STP0) is OFF, a signal is input to the STP2 terminal for 2 seconds or more.	↑