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

Toyota CH-R Service Manual / Pre-collision / Pre-collision System / 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

NOTICE:

  • When replacing the millimeter wave radar sensor assembly, always replace it with a new one.
  • When the millimeter wave radar sensor assembly is replaced with a new one, adjustment of the radar sensor beam axis must be performed.

    Click here

  • The pre-collision system uses the CAN communication system. First, confirm that there are no malfunctions in the CAN communication system. Refer to How to Proceed with Troubleshooting.

    Click here

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)

    Brake Control Signal Mismatch (C1A69)
    DESCRIPTION The skid control ECU (brake actuator assembly) sends signals to the millimeter wave radar sensor assembly according to the brake control status. If the millimeter wave radar sensor as ...

    Skid Control Buzzer Circuit (C1A4A)
    DESCRIPTION The millimeter wave radar sensor assembly is connected to the forward recognition camera via CAN communication. The millimeter wave radar sensor assembly operates the pre-collision ala ...

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