Toyota Tacoma (2015-2018) Service Manual: Millimeter Wave Radar Sensor Communication Stop Mode

Toyota Tacoma (2015-2018) Service Manual / Can Communication / Can Communication System / Millimeter Wave Radar Sensor Communication Stop Mode

DESCRIPTION

Detection Item	Symptom	Trouble Area
Millimeter Wave Radar Sensor Communication Stop Mode	Either Condition is met: Communication stop for "Front Radar" is indicated on the "Communication Bus Check" screen of the Techstream. Click here Communication system DTCs (DTCs that start with U) that correspond to "Millimeter Wave Radar Sensor Communication Stop Mode" in "DTC Combination Table" are output. Click here	Millimeter wave radar sensor assembly CAN branch line or connector Power source circuit of millimeter wave radar sensor assembly Millimeter wave radar sensor assembly ground circuit Millimeter wave radar sensor assembly

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

NOTICE:

Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.
Click here
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.
Click here
Some parts must be initialized and set when replacing or removing and installing parts.
Click here
After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.
DTC check procedure: Turn the ignition switch to ON and wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.
After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed as normal.
Click here
Inspect the fuses for circuits related to this system before performing the following procedure.

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.	CHECK FOR OPEN IN CAN BUS LINES (MILLIMETER WAVE RADAR SENSOR ASSEMBLY CAN BRANCH LINE)

(a) Disconnect the cable from the negative (-) battery terminal.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
M8-3 (CA2H) - M8-2 (CA2L)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

Text in Illustration

*a	Front view of wire harness connector (to Millimeter Wave Radar Sensor Assembly)

REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (MILLIMETER WAVE RADAR SENSOR ASSEMBLY)

2.	CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
M8-1 (SGND) - Body ground	Cable disconnected from negative (-) battery terminal	Below 1 Ω

(b) Connect the cable to the negative (-) battery terminal.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
M8-8 (IGB) - Body ground	Ignition switch ON	11 to 14 V

Text in Illustration

*a	Front view of wire harness connector (to Millimeter Wave Radar Sensor Assembly)

REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

Central Gateway ECU Communication Stop Mode

DESCRIPTION Detection Item Symptom Trouble Area Central Gateway ECU Communication Stop Mode Communication system DTCs (DTCs that start wit ...

Navigation Receiver Assembly Communication Stop Mode

DESCRIPTION Detection Item Symptom Trouble Area Navigation Receiver Assembly Communication Stop Mode Either condition is met: ...

Other materials:

Data List / Active Test
DATA LIST / ACTIVE TEST DATA LIST NOTICE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not. HINT: Using the Techstream to read the Data List allows the ...

Fail-safe Chart
FAIL-SAFE CHART 1. PULSE FAILURE OR DISPLACEMENT OF NON-DETECTION RANGE TO THE OPENING DIRECTION (a) If the pulse sensor built into the power window regulator motor malfunctions, the power window control system enters fail-safe mode. Power Window Regulator Master Switch Assembly, Front Power Wi ...

Front Radar Sensor Incorrect Axial Gap (C1A11,C1A14)
DESCRIPTION When the system determines that the vehicle is driving straight ahead based on signals from the yaw rate and acceleration sensor (airbag sensor assembly), etc., the millimeter wave radar sensor assembly performs self-diagnosis to check if the sensor beam axis is misaligned. C1A11 ...