DTC C1A4B: Stop Light Relay Circuit [09/2014 - 11/2017]: Description
The brake actuator assembly (skid control ECU) sends a stop light operation signal to the semiconductor PWR integration ECU. When the brake actuator assembly (skid control ECU) detects a malfunction in the stop light circuit, the driving support ECU assembly stores DTC C1A4B.
| DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
| C1A4B |
Stop Light Relay Circuit |
Either of the following conditions is met:
- When the vehicle speed is approximately 36 km/h (22 mph) or more, the cruise control switch (ON-OFF button) is on, the IG1 terminal voltage is between 11 and 14 V and the stop light illumination output signal (STOP) is output, the signal is not received at terminal STP2 for 0.3 seconds or more.
- When the vehicle speed is approximately 36 km/h (22 mph) or more, the cruise control switch (ON-OFF button) is on, the IG1 terminal voltage is between 11 and 14 V and the stop light illumination output signal (STOP) is output, the signals received at terminals STP and STP2 are different for 0.3 seconds or more.
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- Lighting system
- Vehicle stability control system
- Harness or connector
- Semiconductor PWR integration ECU
- Driving support ECU assembly
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