DTC C1B11: Short in Motor Circuit; DTC C1B12: Open in Motor Circuit [12/2017 - 10/2023]: Description

The DRS ECU (rear steering control ECU) detects the current flowing to the motor. When a malfunction such as an overcurrent is detected, DTC C1B11 is stored. When the DRS ECU (rear steering control ECU) detects a problem with the motor terminals or ECU motor drive circuit, DTC C1B12 is stored.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Return-to-normal Condition
C1B11	Short in Motor Circuit	Either condition is met: After the engine switch is turned on (IG), a short in the motor circuit or an internal ECU (motor drive circuit) malfunction continues for 1.2 seconds or more before control starts. After the engine switch is turned on (IG), a short in the motor circuit or an internal ECU (motor drive circuit) malfunction continues for 0.1 seconds or more.	Rear steering link assembly DRS ECU (rear steering control ECU)	Comes on	Engine switch on (IG) again
C1B12	Open in Motor Circuit	Either condition is met: After the engine switch is turned on (IG), an open in the motor circuit or an internal ECU (motor drive circuit) malfunction continues for 1.2 seconds or more before control starts. After the engine switch is turned on (IG), an open in the motor circuit or an internal ECU (motor drive circuit) malfunction continues for 0.2 seconds or more.	Rear steering link assembly DRS ECU (rear steering control ECU)	Comes on	Engine switch on (IG) again

DTC DETECTION CONDITIONS: C1B11

		Vehicle Condition
		Pattern 1	Pattern 2	Pattern 3	Pattern 4
Diagnosis Condition	After the engine switch is turned on (IG) and before control starts	◦	◦	-	-
Diagnosis Condition	After the engine switch is turned on (IG)	-	-	◦	◦
Malfunction Status	A short in the motor circuit	◦	-	◦	-
Malfunction Status	An internal ECU (motor drive circuit) malfunction	-	◦	-	◦
Detection Time		1.2 seconds or more	1.2 seconds or more	0.1 seconds or more	0.1 seconds or more
Number of Trips		1 trip	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: C1B12

		Vehicle Condition
		Pattern 1	Pattern 2	Pattern 3	Pattern 4
Diagnosis Condition	After the engine switch is turned on (IG) and before control starts	◦	◦	-	-
Diagnosis Condition	After the engine switch is turned on (IG)	-	-	◦	◦
Malfunction Status	An open in the motor circuit	◦	-	◦
Malfunction Status	An internal ECU (motor drive circuit) malfunction	-	◦	-	◦
Detection Time		1.2 seconds or more	1.2 seconds or more	0.2 seconds or more	0.2 seconds or more
Number of Trips		1 trip	1 trip	1 trip	1 trip

HINT:

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