DTC Description

If abnormal signal from either brake lamp switch or brake switch is detected, HECU sets DTC C1542.

DTC Detecting Condition

Item

Detecting Condition

Possible Cause

DTC Strategy

Signal Monitoring

1.

Brake Lamp Switch Circuit Open/Short

2.

Defected Brake Lamp Switch

Threshold Value

Brake Lamp Switch is ON for 120 sec upon vehicle speed of over 20 km/h and pressure sensor signal less than 7 bar.

Brake Lamp Switch OFF for more than 3 sec upon pressure sensor signal higher than 15 bar.

DTC is set and warning lamp is "ON" when failure is detected 3 consecutively times on same ignition cycle.

Warning Indicator Lamp Status

ON

Clear Condition

Ignition "OFF" and then "ON"

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