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 2gr-fks) / 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)

Front Radar Sensor Incorrect Axial Gap (C1A11,C1A14)

DESCRIPTION When the system determines that the vehicle is driving straight ahead based on signals from the yaw rate and acceleration sensor (airbag sensor assembly), etc., the millimeter wave ra ...

Vehicle Information Not Obtained (C1A02)

DESCRIPTION When a new millimeter wave radar sensor assembly is installed, it receives vehicle specification information (destination, steering wheel position, 2WD or 4WD, etc.) from the main bod ...

Other materials:

Disassembly
DISASSEMBLY CAUTION / NOTICE / HINT HINT: Use the same procedure for both the LH and RH sides. The procedure described below is for the LH side. PROCEDURE 1. REMOVE FOG LIGHT BULB (a) Turn the fog light bulb in the direction indicated by the arrow in the illust ...

Terminals Of Ecu
TERMINALS OF ECU 1. COMBINATION METER ASSEMBLY (a) Measure the voltage, resistance and check for pulses according to the value(s) in the table below. Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition ...

Installation
INSTALLATION CAUTION / NOTICE / HINT HINT: Use the same procedure for both the RH and LH sides. The procedure described below is for the LH side. PROCEDURE 1. INSTALL CURTAIN SHIELD AIRBAG ASSEMBLY (a) Insert the 6 hooks, install 7 new bolts, 2 new clips (A) with pins and 2 ...