DTC C1A4B: Stop Light Relay Circuit [08/2015 - ]: Description
The master cylinder solenoid (skid control ECU) sends a stop light operation request signal to the brake light relay (STP LP OPE). If the master cylinder solenoid (skid control ECU) detects a malfunction in the stop light relay circuit, the driving support ECU assembly stores DTC C1A4B.
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Vehicle Condition |
| Pattern 1 |
Pattern 2 |
| Diagnosis Condition |
IG1 terminal voltage is 11 to 14 V |
◦ |
◦ |
| Stop Light illumination output (STPO) ON |
◦ |
- |
| Stop Light illumination output (STPO) OFF |
- |
◦ |
| Malfunction Status |
No signal input to STP2 terminal |
◦ |
- |
| Signals input to STP and STP2 terminals do not match |
- |
◦ |
| Malfunction Time |
0.3 seconds or more |
0.3 seconds or more |
| Number of Trips |
- |
- |
| DTC No. |
DTC Detection Condition |
Trouble Area |
| C1A4B |
Either of the following conditions is met:
- When the engine switch is on (IG), the IG1 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 stop light illumination output (STPO) signal is off, signals input to the STP terminal and STP2 terminal of the master cylinder solenoid (skid control ECU) differ for 0.3 seconds or more continuously.
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- Lighting system
- brake light relay (STP LP OPE)
- Master cylinder solenoid (Skid control ECU)
- Harness or connector
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