DTC C052C-13: ABS Pump Motor Control Circuit Open; DTC C052C-49: ABS Pump Motor Control Internal Electronic Failure; DTC C052F-14: ABS Pump Motor Supply Voltage Circuit Short to Ground or Open [12/2019 - ]: Description

The motor relay and motor fail safe relay are built into the brake actuator assembly.

When the skid control ECU (brake actuator assembly) operates ABS, TRAC, VSC, or brake assist, etc., the motor relay turns ON and drives the motor pump built into the brake actuator assembly.

If any DTCs related to motor supply power are stored, fail-safe is performed and supply of power to the motor relay is cut by the motor fail safe relay.

If the voltage supplied to the motor relay (BM) is below the DTC detection threshold due to low voltage from the auxiliary battery or alternator, these DTCs may be stored.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C052C-13	ABS Pump Motor Control Circuit Open	Either of the following is detected: When the +BS terminal voltage is from 9.5 to 17.4 V with the motor relay ON while control operates, a relay contact OFF condition continues for 0.12 seconds or more. When the +BS terminal voltage is from 9.5 to 17.4 V, a motor relay supervision voltage malfunction continues for 0.12 seconds or more when the motor relay turns ON during control operation.	Wire harness and connector Skid control ECU (brake actuator assembly)
C052C-49	ABS Pump Motor Control Internal Electronic Failure	Any of the following is detected: When the +BS terminal voltage is from 9.5 to 17.4 V, overcurrent in the motor relay and motor fail-safe relay continues for 0.05 seconds or more. Motor relay overcurrent continues for 0.05 seconds or more. When the +BS terminal voltage is from 9.5 to 17.4 V, a motor relay gate voltage malfunction continues for 0.12 seconds or more.	Wire harness and connector Skid control ECU (brake actuator assembly)
C052F-14	ABS Pump Motor Supply Voltage Circuit Short to Ground or Open	When voltage at +BS terminal is 9.5 V or higher, open in BM terminal continues for 1 second or more.	Wire harness and connector Skid control ECU (brake actuator assembly)