DTC B278A: Short to GND in Immobiliser System Power Source Circuit [11/2018 - ]: Description

WARNING: This page is about a different variant/trim than selected.

When there is a short to GND in the power supply for the transponder key amplifier of the power switch, the certification ECU (smart key ECU assembly) stores this DTC.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Note
B278A	Short to GND in Immobiliser System Power Source Circuit	Short to GND detected in the power supply of the transponder key amplifier of the power switch (VC5 - VC5) (1 trip detection logic*).	Harness or connector Power switch Certification ECU (smart key ECU assembly)	DTC Output Confirmation Operation: With the shift state park (P) and the electrical key transmitter sub-assembly held near the power switch, a hybrid control system start operation is performed by pressing and holding the power switch when the transmitter battery is depleted.

*: Only output while a malfunction is present.

VEHICLE CONDITION AND FAIL-SAFE OPERATION WHEN MALFUNCTION DETECTED

Vehicle Condition when Malfunction Detected	Fail-safe Operation when Malfunction Detected
Hybrid control system cannot be started when transmitter battery is depleted by holding electrical key transmitter sub-assembly near power switch and pressing and holding power switch with shift state park (P).	-

RELATED DATA LIST AND ACTIVE TEST

DTC No.	Data List and Active Test
B278A	-