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:

Brake Signal Malfunction (B2284)
DESCRIPTION This DTC is stored when the brake signal sent via direct line and the brake signal sent via CAN communication do not match. HINT: When the cable is disconnected and reconnected to the negative (-) battery terminal, the power source mode returns to the state it was in before the ca ...

Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each sy ...

Crawl Switch
Components COMPONENTS ILLUSTRATION Inspection INSPECTION PROCEDURE 1. INSPECT CRAWL CONTROL SWITCH (DRIVE MONITOR SWITCH) (a) Check the resistance. (1) Measure the resistance according to the value(s) in the table below. Text in Illustration *1 Crawl Control Sw ...