Toyota Tacoma (2015-2018) Service Manual: Front Radar Sensor Region Code Mismatch (C1A0A)

Toyota Tacoma (2015-2018) Service Manual / Cruise Control / Dynamic Radar Cruise Control System(for 2tr-fe) / Front Radar Sensor Region Code Mismatch (C1A0A)

DESCRIPTION

When the destination information in the millimeter wave radar sensor assembly and forward recognition camera do not match, DTC C1A0A is stored.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL
C1A0A	Front Radar Sensor Region Code Mismatch	When the ignition switch is ON and the dynamic radar cruise control system is operating, the destination information in the forward recognition camera and millimeter wave radar sensor assembly do not match for approximately 1.3 seconds or more.	Millimeter wave radar sensor assembly Forward recognition camera	Does not come on

CAUTION / NOTICE / HINT

NOTICE:

Check that the millimeter wave radar sensor assembly has not been replaced with one from another vehicle.
When replacing the millimeter wave radar sensor assembly, make sure to replace it with a new one. If a device which was installed to another vehicle is used, the information stored in the millimeter wave radar sensor assembly will not match the information from the vehicle, and as a result, a DTC may be stored.
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
When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle. As a result, a DTC may be stored.
If the forward recognition camera has been replaced with a new one, be sure to perform Forward Recognition Camera Learning.
Click here
First check the CAN communication system by following How to Proceed with Troubleshooting. After checking that there are no malfunctions in the CAN communication system, proceed with troubleshooting.
Click here

PROCEDURE

1.	CHECK FOR DTC

(a) Clear the DTCs.

Click here (b) Perform the following procedure.

(b) Perform the following procedure.

HINT:

If the following procedure is not performed, the previously output DTC cannot be detected.

Turn the ignition switch to ON.
Turn the dynamic radar cruise control system on using the cruise control main switch.
Wait for 2 seconds or more.

Click here

Result	Proceed to
DTC C1A0A is not output	A
DTC C1A0A is output	B

USE SIMULATION METHOD TO CHECK

2.	REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY

(a) Replace the millimeter wave radar sensor assembly.

Click here (b) Perform millimeter wave radar sensor assembly adjustment.

(b) Perform millimeter wave radar sensor assembly adjustment.

Click here

3.	CHECK FOR DTC

(a) Clear the DTCs.

Click here (b) Perform the following procedure.

(b) Perform the following procedure.

HINT:

If the following procedure is not performed, the previously output DTC cannot be detected.

Turn the ignition switch to ON.
Turn the dynamic radar cruise control system on using the cruise control main switch.
Wait for 2 seconds or more.

Click here

Result	Proceed to
DTC C1A0A is not output	A
DTC C1A0A is output	B

END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE)

4.	REPLACE FORWARD RECOGNITION CAMERA

(a) Replace the forward recognition camera with a new one.

Click here (b) Perform forward recognition camera adjustment.

(b) Perform forward recognition camera adjustment.

Click here

END (FORWARD RECOGNITION CAMERA WAS DEFECTIVE)

Communication Error from VSC to ECM (P1630)

DESCRIPTION The skid control ECU (brake actuator assembly) sends signals such as cruise control cancel signals and brake demand response signals to the ECM when the dynamic radar cruise control s ...

Front Radar Sensor (C1A10)

DESCRIPTION C1A10 is output when there is an internal malfunction in the millimeter wave radar sensor assembly. DTC No. Detection Item DTC Detection Condition ...

Other materials:

Pressure Control Solenoid "B" Circuit Open (P077513)
DESCRIPTION Changing from 1st to 6th is performed by the ECM turning shift solenoid valves SL1, SL2, SL3 and SL4 on and off. If an open or short circuit occurs in any of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be operated ...

Installation
INSTALLATION PROCEDURE 1. ADJUST COMPRESSOR OIL (a) for HFC-134a (R134a): (1) When replacing the compressor and magnetic clutch with new ones, after gradually discharging the refrigerant gas from the service valve, drain the following volume of oil from new compressor and magnetic clutch bef ...

System Diagram
SYSTEM DIAGRAM Transmitting ECU (Transmitter) Receiving ECU Signal Communication Method 4 wheel drive control ECU Skid control ECU (Brake actuator assembly) Rear differential lock status signal H ...