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Home >> Toyota >> 2011 >> Highlander Hybrid >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Electronically Controlled Brake System (Diagnostic Codes & Symptom Tests) (Hybrid) >> Electronically Controlled Brake System >> DTC C1378/44: Capacitor Communication Malfunction >> Description

DTC C1378/44: Capacitor Communication Malfunction: Description

The brake control power supply (capacitor) provides auxiliary power for brake control when the auxiliary battery voltage (12 V) drops.

The FAIL and ENA lines are placed between the skid control ECU and the brake control power supply.

Signals indicating that the brake control power supply is in auxiliary mode are sent to the skid control ECU through the FAIL line.

Charge permit prohibition signals are sent to the brake control power supply through the ENA line.

DTC Code INF Code DTC Detection Condition Trouble Area
C1378/44 112 Any of the following is detected:
  1. Open or short in FAIL line.
  2. Malfunction inside the power back-up unit.
  3. IG1 terminal voltage is 9.5 V or more and condition that capacitor communication is malfunctioning continues for 12 seconds or more.
  • Brake control power supply
  • Brake control power supply circuit
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