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Home >> Lexus >> 2023 >> LS 500h >> Repair and Diagnosis >> Brakes >> Parking Brake System >> Electric Parking Brake System (W/ Advanced Park) - Diagnostic Codes & Symptom Tests >> ELECTRIC PARKING BRAKE SYSTEM (w/ Advanced Park) >> DTC C1120-12: Electric Parking Brake Tension Sensor "A" Circuit Short to Battery [11/2021 - 10/2023] >> Description

DTC C1120-12: Electric Parking Brake Tension Sensor "A" Circuit Short to Battery [11/2021 - 10/2023]: Description

The tension sensor is built into the parking brake with bracket actuator assembly. It detects the tension value of the parking brake cable and outputs the value to the No. 2 skid control ECU (brake actuator assembly).

DTC No. Detection Item DTC Detection Condition Trouble Area Memory Note
C1120-12 Electric Parking Brake Tension Sensor "A" Circuit Short to Battery
  • Diagnosis Condition:

    Electric parking brake switch assembly is operated to lock side with ignition switch off or ignition switch ON

  • Malfunction Status:

    Tension1 voltage is 4.5 V or more

  • Malfunction Duration:

    Approximately 1 second

  • Parking brake with bracket actuator assembly
  • Wire harness or connector
  • No. 2 skid control ECU (brake actuator assembly)
DTC stored An electric parking brake system malfunction is displayed on the multi-information display.
DTC DETECTION CONDITIONS

  Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition Electric parking brake switch assembly is operated to lock side with ignition switch off ◦ -
Ignition switch ON - ◦
Malfunction Status Tension1 voltage is 4.5 V or more ◦ ◦
Detection Time Approximately 1 second Approximately 1 second
Number of Trips 1 trip 1 trip

HINT: 

DTC will be output when conditions for either of the patterns in the table above are met.