Some markets have an Emergency Stop Signal (ESS) function. When a vehicle is in an emergency stop condition, the brake lamp blinks to inform the vehicle behind of the emergency stop. While this function is operating, ESS brake lamp relay flashes the brake lamp.
The HECU monitors the ESS brake lamp relay (ESS) relay for normal operation. If there is an open or short in the relay circuit, this DTC is set.
Item | Detecting Condition | Possible cause |
DTC Strategy |
•
Voltage Monitoring | 1. Open or short in the ESS brake lamp relay(ESS relay) circuit 2. Faulty ESS brake lamp relay(ESS relay) |
Monitoring Period |
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When ESS brake lamp relay drive OFF - If the monitor of ESS Brake Lamp Drive is ON, The failure is recognized. - If the monitor of ESS Brake Lamp Relay is different from BLS signal, The failure is recognized.
•
When ESS brake lamp relay drive ON - If the monitor of ESS Brake Lamp Drive is OFF, The failure is recognized. - If the monitor of ESS Brake Lamp Relay is ON, The failure is recognized. | |
Fail Safe |
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