Toyota Tacoma (2015-2018) Service Manual: Lost Communication With Image Processing Module "A" (U023A)

Toyota Tacoma (2015-2018) Service Manual / Pre-collision / Pre-collision System / Lost Communication With Image Processing Module "A" (U023A)

DESCRIPTION

The millimeter wave radar sensor assembly communicates with the forward recognition camera via CAN communication. If there is a communication error with the forward recognition camera, the millimeter wave radar sensor assembly stores DTC U023A.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
U023A	Lost Communication With Image Processing Module "A"	When the ignition switch is ON, a communication error between the forward recognition camera and millimeter wave radar sensor assembly is detected for approximately 1 second.	CAN communication system Forward recognition camera power source circuit Forward recognition camera Wire harness or connector Millimeter wave radar wire

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.
Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.
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When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle. As a result, a DTC may be stored.
If the forward recognition camera has been replaced with a new one, be sure to perform forward recognition camera adjustment.
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HINT:

Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.
When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.

PROCEDURE

1.	READ VALUE USING TECHSTREAM (CAN BUS CHECK)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: System Select / Can Bus Check.

Result	Proceed to
All of the ECUs and sensors that are currently connected to the CAN communication system are displayed	A
None of the ECUs and sensors that are currently connected to the CAN communication system are displayed, or some of them are not displayed	B

GO TO CAN COMMUNICATION SYSTEM

2.	CHECK FOR DTCs (PRE-COLLISION SYSTEM)

(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.

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Result	Proceed to
DTC U1002 is not output	A
DTC U1002 is output	B

GO TO DTC CHART (U1002)

3.	CHECK FOR OPEN IN CAN BUS LINES (MILLIMETER WAVE RADAR SENSOR ASSEMBLY - FORWARD RECOGNITION CAMERA)

(a) Disconnect the F46 forward recognition camera connector.

(b) Disconnect the M8 millimeter wave radar sensor assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F46-6 (CANH) - M8-5 (CA1P)	Cable disconnected from negative (-) battery terminal	Below 1 Ω
F46-12 (CANL) - M8-6 (CA1N)	Cable disconnected from negative (-) battery terminal	Below 1 Ω

(d) Connect the M8 millimeter wave radar sensor assembly connector.

(e) Connect the F46 forward recognition camera connector.

GO TO STEP 5

4.	CHECK HARNESS AND CONNECTOR (POWER SOURCE VOLTAGE)

(a) Disconnect the forward recognition camera connector.

*a	Front view of wire harness connector (to Forward Recognition Camera)

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F46-10 (GND) - Body ground	Always	Below 1 Ω

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
F46-7 (IGB) - Body ground	Ignition switch ON	11 to 14 V

(e) Connect the F46 forward recognition camera connector.

REPLACE FORWARD RECOGNITION CAMERA

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

5.	CHECK FOR OPEN IN CAN BUS LINES (MILLIMETER WAVE RADAR WIRE - FORWARD RECOGNITION CAMERA)

(a) Disconnect the F46 forward recognition camera connector.

(b) Disconnect the EP1 millimeter wave radar wire connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F46-6 (CANH) - EP1-5	Cable disconnected from negative (-) battery terminal	Below 1 Ω
F46-12 (CANL) - EP1-6	Cable disconnected from negative (-) battery terminal	Below 1 Ω

(d) Connect the F46 millimeter wave radar wire connector.

(e) Connect the EP1 forward recognition camera connector.

REPAIR MILLIMETER WAVE RADAR WIRE

REPAIR OR REPLACE CAN BUS LINE OR CONNECTOR (MILLIMETER WAVE RADAR WIRE - FORWARD RECOGNITION CAMERA)

Fail-safe Chart

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