DTC C1A4B: Stop Light Relay Circuit [10/2015 - 09/2017]: Description
The skid control ECU (brake actuator assembly) sends a stop light operation request signal to the No. 2 integration relay (stop light relay). If the skid control ECU (brake actuator assembly) detects a malfunction in the stop light relay 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 50 km/h (30 mph) or more, the cruise control switch (ON/OFF) is on, the +BS terminal voltage is between 11 and 14 V and the stop light illumination output signal (STPO) is output, the signal is not received at terminal STP2 for 0.3 seconds or more.
- When the vehicle speed is approximately 50 km/h (30 mph) or more, the cruise control switch (ON/OFF) is on, the +BS terminal voltage is between 11 and 14 V and the stop light illumination output signal (STPO) is not output, the signals received at terminals STP and STP2 are different for 0.3 seconds or more.
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- Lighting system
- Skid control ECU (brake actuator assembly)
- No. 2 integration relay (Stop light relay)
- Harness or connector
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