DTC C1A4B: Stop Light Relay Circuit [09/2017 - 05/2019]: Description
The skid control ECU (brake booster with master cylinder assembly) sends a stop light operation request signal to the stop light control ECU assembly. If the skid control ECU (brake booster with master cylinder assembly) detects a malfunction in the stop light control ECU assembly circuit, the driving support ECU assembly stores DTC C1A4B.
| DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
| C1A4B |
Stop Light Relay Circuit |
Diagnosis condition:
- Power switch is on (IG) and auxiliary battery voltage between 8.9 V or more
Malfunction condition:
Either of the following conditions is met:
- When the stop light illumination output (STPO) signal is on, a signal has not been input to the STP2 terminal for 0.3 seconds or more continuously.
- When the stop light illumination output (STPO) signal is off, signals input to the STP terminal and STP2 terminal of the skid control ECU (brake booster with master cylinder assembly) differ for 0.3 seconds or more continuously.
|
- Skid control ECU (brake booster with master cylinder assembly)
- Stop light switch assembly
- 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
- Hybrid vehicle control ECU
- Shift lock control unit assembly (Shift lever assembly)
- Certification ECU (smart key ECU assembly)
- Harness or connector
- Vehicle approaching speaker controller
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