The DBC function is the shorten word of Downhill Brake Control function. When a vehicle goes down the hill, just pushing the DBC switch enables the car to keep its vehicle's speed at a constant value without operating the brake pedal. The DBC function is operated when the vehicle is on the decline and its velocity is under the predetermined speed.
The HECU monitors the brake lamp relay(DBC relay) for a normal operation and if there is a open or short circuit in the relay, this DTC is set.
Item | Detecting Condition | Possible cause |
DTC Strategy |
•
Voltage Monitoring |
•
Open or short in the brake lamp relay(DBC relay) circuit
•
Faulty brake lamp relay(DBC relay) |
Enable Conditions |
•
When the brake lamp is switched off, the brake lamp drive monitor has a low value for more than a certain period
•
When the brake lamp is switched on, the brake lamp drive monitor has a high value for more than a certain period
•
When the brake lamp is switched on, the brake lamp signal(BLS) has a low value for more than a certain period | |
Fail Safe |
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