Toyota Tacoma manuals

Toyota Tacoma (2015-2018) Service Manual: 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

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

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.

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

(c) Check for DTCs.

Click here

Result

Proceed to

DTC C1A02 is not output

A

DTC C1A02 is output

B

A

USE SIMULATION METHOD TO CHECK

B

REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY

Communication Error from ECM to VSC (P1631)
DESCRIPTION The ECM sends signals such as A/T information signals, dynamic radar cruise control operation signals, brake operation demand signals, and buzzer operation demand signals to the skid ...

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 ...

Other materials:

Illumination Circuit
DESCRIPTION Power is supplied to the radio and display receiver assembly and steering pad switch assembly illumination when the light control switch is in the TAIL or HEAD position. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: The vehicle is equipped with a Supplemental Restrain ...

Removal
REMOVAL CAUTION / NOTICE / HINT HINT: Use the same procedure for the RH and LH sides. The procedure described below is for the LH side. PROCEDURE 1. REMOVE FRONT DOOR GLASS RUN 2. REMOVE FRONT DOOR GLASS OUTER WEATHERSTRIP ASSEMBLY (See page ) 3. REMOVE NO. 1 BLAC ...

Meter Illumination does not Dim at Night
DESCRIPTION In this circuit, the combination meter assembly auto dimmer signals from the main body ECU using the CAN communication system (CAN V1 Bus). When the combination meter assembly an auto dimmer signal, it dims the meter illumination (warning and indicator lights). The main body ECU ( ...

В© 2011-2025 Copyright www.ttguide.net