Toyota Tundra Service Manual: Vehicle Information Not Obtained (C1A02)

Toyota Tundra Service Manual / Vehicle Interior / Pre-collision / Pre-collision System / Vehicle Information Not Obtained (C1A02)

DESCRIPTION

When a new millimeter wave radar sensor assembly is installed, it receives vehicle specification information from the main body ECU (multiplex network body ECU) and stores the information.

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

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1A02

Vehicle Information Not Obtained

When the vehicle is being driven at a speed of 50 km/h (32 mph) or more, the millimeter wave radar sensor assembly does not have stored vehicle information for 1 second 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.
  • If the millimeter wave radar sensor assembly has been replaced, be sure to perform millimeter wave radar sensor assembly adjustment.

    Click here

PROCEDURE

1.

CHECK FOR DTCs (PRE-COLLISION SYSTEM)

(a) Clear the DTCs.

Click here

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

HINT:

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

(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

    Pre-collision System

    Skid Control Buzzer Circuit (C1A4A)

    See More:

    Toyota Tundra Service Manual > Rear Door(for Crewmax): On-vehicle Inspection
    ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT REAR DOOR PANEL SUB-ASSEMBLY LH (a) Check that the clearance measurements of areas A to J are within the standard range. Standard measurement: Area Specified Condition Area Specified Condition A 4.7 to 7.7 mm (0.185 to 0.303 in.) F 0.7 to 3.7 mm (0.0276 to ...

    Toyota Tundra Owners Manual

    Toyota Tundra Service Manual

    © 2026 Copyright www.ttundra.com
    0.0351