Toyota CH-R Service Manual: Brake System Malfunction (C1A50)

DESCRIPTION

When the pre-collision system is operating, the millimeter wave radar sensor assembly sends brake control signals to the skid control ECU (brake actuator assembly).

When the millimeter wave radar sensor assembly receives a VSC system malfunction signal from the skid control ECU (brake actuator assembly) via CAN communication, DTC C1A50 is stored.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1A50	Brake System Malfunction	While the ignition switch to ON, the millimeter wave radar sensor assembly receives a VSC system malfunction signal from the skid control ECU (brake actuator assembly) for 0.3 seconds or more.	Vehicle stability control system Skid control ECU (Brake actuator assembly) Millimeter wave radar sensor assembly

CAUTION / NOTICE / HINT

PROCEDURE

1.	CHECK FOR DTCs (VEHICLE STABILITY CONTROL SYSTEM)

HINT:

Pre-collision system DTC C1A50 may be stored due to a malfunction in the VSC system. Therefore, it is necessary to check for and troubleshoot VSC system DTCs first.

(a) Check for DTCs.

Click here

Chassis > ABS/VSC/TRAC/EPB > Trouble Codes

Result	Proceed to
Vehicle stability control system DTCs are not output	A
Vehicle stability control system DTCs are output	B

B

GO TO VEHICLE STABILITY CONTROL SYSTEM

A

2.	CHECK FOR DTCs (PRE-COLLISION SYSTEM)

(a) Clear the DTCs.

Click here

Body Electrical > Pre-Collision 2 > Clear DTCs

(b) Make sure that the DTC detection conditions are met.

HINT:

If the detection conditions are not met, the system cannot detect the malfunction.

(c) Check for DTCs.

Click here

Body Electrical > Pre-Collision 2 > Trouble Codes

Result	Proceed to
DTC C1A50 is not output	A
DTC C1A50 is output	B

A

USE SIMULATION METHOD TO CHECK

B

3.	REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY

(a) Replace the millimeter wave radar sensor assembly.

Click here

(b) Adjust the millimeter wave radar sensor assembly.

Click here

NEXT

4.	CHECK FOR DTCs (PRE-COLLISION SYSTEM)

(a) Clear the DTCs.

Click here

Body Electrical > Pre-Collision 2 > Clear DTCs

(b) Make sure that the DTC detection conditions are met.

HINT:

If the detection conditions are not met, the system cannot detect the malfunction.

(c) Check for DTCs.

Click here

Body Electrical > Pre-Collision 2 > Trouble Codes

Result	Proceed to
DTC C1A50 is not output	A
DTC C1A50 is output	B

A

END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE)

B

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)