PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:C1A64

DTC Code	DTC Name
C1A64	Brake Control Signal Mismatch

DESCRIPTION

for 2TR-FE:

The brake actuator assembly sends signals to the driving support ECU assembly according to the brake control status. If the driving support ECU assembly receives a vehicle stability control system malfunction signal from the brake actuator assembly, it will store DTC C1A64.
except 2TR-FE:

The master cylinder solenoid sends signals to the driving support ECU assembly according to the brake control status. If the driving support ECU assembly receives a vehicle stability control system malfunction signal from the master cylinder solenoid, it will store DTC C1A64.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1A64	Brake Control Signal Mismatch	for 2TR-FE: While the ignition switch is ON, the driving support ECU assembly receives a vehicle stability control system malfunction signal from the skid control ECU (brake actuator assembly) continuously for 0.5 seconds or more. except 2TR-FE: While the ignition switch is ON, the driving support ECU assembly receives a vehicle stability control system malfunction signal from the skid control ECU (master cylinder solenoid) continuously for 0.5 seconds or more.	Vehicle stability control system Skid control ECU assembly (brake actuator assembly) (for 2TR-FE) Skid control ECU assembly (master cylinder solenoid) (except 2TR-FE) Driving support ECU assembly

CAUTION / NOTICE / HINT

Note

When replacing the driving support ECU assembly, always replace it with a new one. If a driving support ECU assembly which was installed to another vehicle is used, the information stored in the driving support ECU assembly will not match the information from the vehicle. As a result, a DTC may be stored.
The pre-crash safety system uses the CAN communication system. First, confirm that there are no malfunction in the CAN communication system. Refer to How to Proceed with Troubleshooting.

Click here

PROCEDURE

CHECK FOR DTCs (VEHICLE STABILITY CONTROL SYSTEM)

Tech Tips

Pre-crash safety system DTC C1A64 may be stored due to a malfunction in the vehicle stability control system. Therefore, it is necessary to check for and troubleshoot vehicle stability control system DTCs first.

Check for DTCs.

for 2TR-FE: Click here

except 2TR-FE: Click here

Result

Result	Proceed to
Vehicle stability control system DTCs are not output	A
Vehicle stability control system DTC are output (for 2TR-FE)	B
Vehicle stability control system DTC are output (except 2TR-FE)	C

GO TO VEHICLE STABILITY CONTROL SYSTEM Click here

CHECK FOR DTCs (PRE-CRASH SAFETY SYSTEM)

Clear the DTCs.

Click here
Make sure that the DTC detection conditions are met.

Tech Tips

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

Check for DTCs.

Click here

Result

Result	Proceed to
DTC C1A64 is not output	A
DTC C1A64 is output	B

USE SIMULATION METHOD TO CHECK Click here

REPLACE DRIVING SUPPORT ECU ASSEMBLY

Replace the driving support ECU assembly.

Click here

Result

Proceed to
NEXT

CHECK FOR DTCs (PRE-CRASH SAFETY SYSTEM)

Clear the DTCs.

Click here
Make sure that the DTC detection conditions are met.

Tech Tips

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

Check for DTCs.

Click here

Result

Result	Proceed to
DTC C1A64 is not output	A
DTC U1104 is output (for 2TR-FE)	B
DTC U1104 is output (except 2TR-FE)	C

END (DRIVING SUPPORT ECU ASSEMBLY WAS DEFECTIVE)

REPLACE BRAKE ACTUATOR ASSEMBLY Click here

REPLACE MASTER CYLINDER SOLENOID for LHD: Click here
REPLACE MASTER CYLINDER SOLENOID for RHD: Click here