DTC C13B4: EPB Switch Malfunction [01/2019 - 04/2020]: Description

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

When the electric parking brake switch is pulled, a lock request signal is sent from the parking brake ECU (brake actuator assembly) to the parking brake actuator assembly. When the electric parking brake switch is pushed, a release request signal is sent from the parking brake ECU (brake actuator assembly) to the parking brake actuator assembly.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	Note
C13B4	EPB Switch Malfunction	for before December 2019 Parking brake switch open or short circuit is detected for 1 second or more Parking brake switch stuck malfunction for from January 2020 Open or short detected in parking brake switch circuit for 1 second or more Stuck parking brake switch detected (when parked: 30 seconds, when driving: 1 second, during engine stall: 1 second) Stuck parking brake switch detected 3 times in succession when being operated	Electric parking brake switch (electric parking brake switch assembly) Wire harness or connector Parking brake ECU (brake actuator assembly)	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

Note

C13B4

EPB Switch Malfunction

for before December 2019

Parking brake switch open or short circuit is detected for 1 second or more
Parking brake switch stuck malfunction

for from January 2020

Open or short detected in parking brake switch circuit for 1 second or more
Stuck parking brake switch detected (when parked: 30 seconds, when driving: 1 second, during engine stall: 1 second)
Stuck parking brake switch detected 3 times in succession when being operated

Electric parking brake switch (electric parking brake switch assembly)
Wire harness or connector
Parking brake ECU (brake actuator assembly)

DTC stored

An electric parking brake system malfunction is displayed on the multi-information display.

DTC DETECTION CONDITIONS: C13B4 (FOR BEFORE DECEMBER 2019)

		Vehicle Condition
		Pattern 1	Pattern 2	Pattern 3
Diagnosis Condition	-	-	-	-
Malfunction Status	Parking brake switch open circuit is detected	◦	-	-
	Parking brake switch short circuit is detected	-	◦	-
	Parking brake switch stuck malfunction	-	-	◦
Detection Time		1 second or more	1 second or more	-
Number of Trips		1 trip	1 trip	1 trip

HINT:

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

DTC DETECTION CONDITIONS: C13B4 (FOR FROM JANUARY 2020)

		Vehicle Condition
		Pattern 1	Pattern 2	Pattern 3	Pattern 4	Pattern 5	Pattern 6
Diagnosis Condition	Vehicle is stopped	-	-	◦	-	-	-
	Vehicle is being driven	-	-	-	◦	-	-
	During initial check	-	-	-	-	◦	-
	Parking brake switch is being operated	-	-	-	-	-	◦
Malfunction Status	Open detected in parking brake switch circuit	◦	-	-	-	-	-
	Short detected in parking brake switch circuit	-	◦	-	-	-	-
	Stuck parking brake switch detected	-	-	◦	◦	◦	◦
Detection Time		1 second or more	1 second or more	30 seconds or more	1 second or more	1 second or more	-
Number of Trips		1 trip	1 trip	1 trip	1 trip	1 trip	3 trip

HINT:

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