DTC Description

If abnormal ESS Brake Lamp Relay signal is detected, HECU sets DTC C2131.

DTC Detecting Condition

Item

Detecting Condition

Possible cause

DTC Strategy

•

Signal Monitoring

1.

ESS Brake Lamp Relay Circuit Open/Short

2.

Defected ESS Brake Lamp Relay

Threshold Value

•

ESS Brake Lamp Relay Drive "OFF"

- ESS Brake Lamp Drive is "ON" for more than 1 sec.

- ESS Brake Lamp Relay Monitor is different than BLS signal for more than 1 sec.

•

Brake Lamp Relay Drive "ON"

- ESS Brake Lamp Drive is "OFF" for more than 1 sec.

- ESS Brake Lamp Relay Monitor is "ON" for more than 1 sec.

Fail Safe

•

-

Warning Indicator Lamp Status

•

-

Clear Condition

•

Ignition "OFF" and then "ON"

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