DTC C13A3: Open or Short Circuit in Lock Switch Circuit; DTC C13AB: Lock Switch Circuit Comparison [09/2018 - ]: Description

When the electric parking brake switch assembly is pushed to the lock side, a lock request signal is output to the parking brake ECU assembly.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	Note
C13A3	Open or Short Circuit in Lock Switch Circuit	All of following conditions are met: Engine switch on (IG) or electric parking brake switch assembly pushed to lock side with engine switch off. Terminal LCK1 voltage is less than 2.3 V or more than 4.35 V; or terminal LCK2 voltage is less than 1.4 V* or more than 9 V. Problem occurs for approximately 1 second. HINT: : This value is based on the assumption that the BECU terminal voltage is 11 V. The threshold changes according to the BECU terminal voltage. For details, refer to "Threshold Changes According to BECU Terminal Voltage".	Electric parking brake switch assembly Wire harness or connector Parking brake ECU assembly	Yes	An electric parking brake system malfunction is displayed on the multi-information display.
C13AB	Lock Switch Circuit Comparison	Both of following conditions are met: Engine switch on (IG) or electric parking brake switch assembly pushed to lock side with engine switch off. ON/OFF judgment of lock switch 1 and lock switch 2 does not match for approximately 1 second.	Electric parking brake switch assembly Wire harness or connector Parking brake ECU assembly	Yes	An electric parking brake system malfunction is displayed on the multi-information display.

Threshold Changes According to BECU Terminal Voltage