Toyota CH-R Service Manual: Brake Control Signal Mismatch (C1A69)

Toyota CH-R Service Manual / Pre-collision / Pre-collision System / 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 assembly receives a VSC system malfunction signal from the skid control ECU (brake actuator assembly), it stores DTC C1A69.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1A69

Brake Control Signal Mismatch

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) continuously for 1 second 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 C1A69 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 C1A69 is not output

A

DTC C1A69 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 C1A69 is not output

A

DTC C1A69 is output

B
A

END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE)
B

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

    Other System Malfunction (C1A63)
    DESCRIPTION The millimeter wave radar sensor receives the throttle signal from the ECM and judges whether the driver is making an acceleration request. When the ECM detects an electronic throttle ...

    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 ...

    Other materials:

    Toyota CH-R Service Manual > Power Door Lock Control System: Operation Check
    OPERATION CHECK CHECK POWER DOOR LOCK OPERATION NOTICE: The operation check below is based on the non-customized initial condition of the vehicle. (a) Check basic functions. (1) Check that all of the doors lock when the lock side of the door control switch is pressed. (2) Check that all of ...

    Toyota CH-R Service Manual > Air Conditioning System(for Automatic Air Conditioning System With Top-mounted Air Conditioner Pressure Sensor): Initialization
    INITIALIZATION INITIALIZATION SERVO MOTOR (a) Turn the ignition switch off. (b) Connect the Techstream to the DLC3. (c) Turn the ignition switch ON. (d) Press the A/C OFF switch. (e) Turn the Techstream on. (f) Enter the following menus: Body Electrical / Air Conditioner / Utility / Servomo ...

    Toyota CH-R Owners Manual

    Toyota CH-R Service Manual

    © 2017-2023 Copyright www.tochr.net
    0.0134