Toyota Tacoma (2015-2018) Service Manual: Vehicle Information Not Obtained (C1A02)

Toyota Tacoma (2015-2018) Service Manual / Cruise Control / Dynamic Radar Cruise Control System(for 2gr-fks) / 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 body ECU (multiplex network body ECU) and stores the information.

DTC C1A02 is stored when the millimeter wave radar sensor assembly cannot store the vehicle specification information from the main body ECU (multiplex network body ECU).

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL
C1A02	Vehicle Information Not Obtained	While the ignition switch is ON and the dynamic radar cruise control system is operating, the millimeter wave radar sensor assembly cannot store the vehicle specification information for approximately 0.1 seconds or more.	Millimeter wave radar sensor assembly	Does not come on

CAUTION / NOTICE / HINT

NOTICE:

When replacing the millimeter wave radar sensor assembly always replace it with a new one. If a millimeter wave radar sensor assembly 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. 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
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 (RADAR CRUISE 2)

(a) Clear the DTCs.

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

(b) Make sure that the DTC detection conditions are met.

HINT:

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

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

Click here

Result	Proceed to
DTC C1A02 is not output	A
DTC C1A02 is output	B

USE SIMULATION METHOD TO CHECK

REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY

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 ...

Clutch Switch Circuit

DESCRIPTION Clutch switch circuit inspection is necessary for manual transmission vehicles. When the clutch pedal is released, the ECM receives the positive (+) battery voltage through the ECU-IG ...

Other materials:

Refueling
Opening the fuel tank cap Perform the following steps to open the fuel tank cap. ■ Before refueling the vehicle Turn the engine switch off and ensure that all the doors and windows are closed. ■ Opening the fuel tank cap Open the fuel filler door. Turn the fuel tank cap slowly ...

Tire Pressure Monitor Receiver Communication Stop (B1247)
DESCRIPTION The main body ECU (multiplex network body ECU) and tire pressure warning ECU and receiver are connected using 2 direct lines that they use to communicate with each other. DTC No. Detection Item DTC Detection Condition Trouble Area ...

Acceleration Sensor Power Supply Voltage Malfunction (C1381)
DESCRIPTION The skid control ECU (brake actuator assembly) receives signals from the yaw rate and acceleration sensor (airbag sensor assembly) via the CAN communication system. The airbag sensor assembly has a built-in acceleration sensor and detects the vehicle condition. If there is troub ...