DTC C1380/64 Stop Light Control Relay Malfunction: Description

Upon receiving the downhill assist control or hill-start assist control operating signal from the skid control ECU, the relay contact turns on and the stop light comes on.

DTC DETECTION CONDITION CHART

DTC Code	DTC Detection Condition	Trouble Area
C1380/64	When the voltage at the IG1 terminal is between 10 V and 14 V and the stop light driving output (STPO) is on, a signal has not been input to the STP terminal for 5 seconds or more When the voltage at the IG1 terminal is between 10 V and 14 V and the stop light driving output (STPO) is off, the input signal at the STP is different from the input signal at the STP2 for 5 seconds or more	Stop light operation relay Stop light operation relay circuit Master cylinder solenoid (Skid control ECU)