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:

Outer Mirror Switch
Inspection INSPECTION PROCEDURE 1. INSPECT OUTER MIRROR SWITCH ASSEMBLY (a) Check the mirror select switch and mirror surface adjust switch. (1) Turn the mirror select switch to the L position. Text in Illustration *a Mirror Select and Surfac ...

Diameter of the Tire is not Uniform (C1337)
DESCRIPTION The skid control ECU (brake actuator assembly) measures the speed of each wheel by receiving signals from the speed sensors. These signals are used for recognizing whether all 4 wheels are operating properly. Therefore, all wheel signals must indicate the same speed. D ...

Transfer Shift Motor Limit Switch Circuit (P17AC)
DESCRIPTION When the transfer switches modes, the TL1, TL2 and TL3 terminals of the limit switch are in one of the ON/OFF combinations listed in the table below. Terminal When 2WD Switching between 2WD and H4 When H4 Switching between H4 and ...