The HECU monitors the brake lamp relay (HAC relay) for normal operation. If there is an open or a short in the relay circuit, this DTC is set.
Item | Detecting Condition | Possible cause |
DTC Strategy |
•
Voltage Monitoring | 1. Open or short in the brake lamp relay(HAC relay) circuit 2. Faulty brake lamp relay(HAC relay) |
Enable Conditions |
•
During HAC activation and brake light switch signal off, the fault is detected with mismatch between the corresponding lamp actuation signal and electrical feedback signa for more than 600ms. | |
Fail Safe |
•
Inhibit the HAC control and allow the ABS/EBD/ESP(ESC) control
•
The ESP(ESC) warning lamp is activated |
