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DTC C1378/44 Capacitor Communication Malfunction: Description

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

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

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.

DIAGNOSTIC TROUBLE CODE CHART

DTC No. INF Code DTC Detection Condition Trouble Area
C1378/44 112
  • Open or short in FAIL line.
  • Malfunction inside the power back up unit.
  • Harness and connector
  • Brake control power supply
  • Skid control ECU
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