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

Toyota Tundra Service Manual / Engine, Hybrid System / Cruise Control / Dynamic Radar Cruise Control System / 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.
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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.
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PROCEDURE

1.	CHECK FOR DTC (RADAR CRUISE 2)

(a) Clear the DTCs.

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(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.

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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

Dynamic Radar Cruise Control System

Skid Control Buzzer Circuit (C1A4A)

See More:

Toyota Tundra Owners Manual > Using the driving support systems: Four-wheel drive system
Summary of functions Use the front-wheel drive control switch to select the following transfer modes: "2WD" (high speed position, two-wheel drive) Use this for normal driving on dry hard-surfaced roads. This position gives greater economy, quietest ride and least wear. "4H" (high speed position, fou ...