DTC C1A4B: Stop Light Relay Circuit [10/2014 - 09/2017]: Description
The brake actuator assembly (skid control ECU) sends a stop light operation signal to the stop light control ECU assembly. When the brake actuator assembly (skid control ECU) detects a malfunction in the stop light circuit, the driving support ECU assembly stores DTC C1A4B.
| |
Vehicle Condition |
| Pattern 1 |
Pattern 2 |
| Diagnosis Condition |
+BS 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. |
Detection Item |
DTC Detection Condition |
Trouble Area |
| C1A4B |
Stop Light Relay Circuit |
Either of the following conditions is met:
- When the engine switch is on (IG), 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. (Pattern 1)
- When the engine switch is on (IG), 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. (Pattern 2)
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- Brake actuator assembly (skid control ECU)
- Stop light control ECU assembly
- Rear combination light assembly LH
- Rear combination light assembly RH
- Rear light assembly LH
- Rear light assembly RH
- Center stop light assembly
- Harness or connector
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