Lexus ES manuals

Lexus ES: Millimeter Wave Radar Sensor Communication Stop Mode

DESCRIPTION

Detection Item

Symptom

Trouble Area

Millimeter Wave Radar Sensor Communication Stop Mode

Any of the following conditions are met:

  • Communication stop for "Front Radar" is indicated on the "Communication Bus Check" screen of the Techstream.

    Click here

  • Communication stop history for "Front Radar" is indicated on the "Communication Bus Check (Detail)" screen of the Techstream. (The Lost Communication Time value for "Front Radar" is 6 or more.)

    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 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 engine 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 engine 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

  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

    DTC check procedure: Turn the engine switch on (IG) 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 BRANCH LINE)

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

(b) Disconnect the A37 millimeter wave radar sensor assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A37-3 (CA2H) - A37-2 (CA2L)

Cable disconnected from negative (-) battery terminal

54 to 69 Ω

*a

Front view of wire harness connector

(to Millimeter Wave Radar Sensor Assembly)

NG

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

OK

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

A37-1 (SGND) - Body ground

Cable disconnected from negative (-) battery terminal

Below 1 Ω

*a

Front view of wire harness connector

(to Millimeter Wave Radar Sensor Assembly)

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

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A37-8 (IGB) - Body ground

Engine switch on (IG)

11 to 14 V

OK

REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

READ NEXT:

 Headup Display Communication Stop Mode

DESCRIPTION Detection Item Symptom Trouble Area Headup Display Communication Stop Mode Any of the following conditions are met: Communication stop for "Head Up Display" is indicated on

 Door Mirror ECU RH Communication Stop Mode

DESCRIPTION Detection Item Symptom Trouble Area Door Mirror ECU RH Communication Stop Mode Any of the following conditions are met: Communication stop for "Front Door RH/R-Mirror (FR-D

 Door Mirror ECU LH Communication Stop Mode

DESCRIPTION Detection Item Symptom Trouble Area Door Mirror ECU LH Communication Stop Mode Any of the following conditions are met: Communication stop for "Front Door LH/L-Mirror (FL-D

SEE MORE:

 Installation

INSTALLATION PROCEDURE 1. INSTALL THROTTLE BODY GASKET (a) Install a new throttle body gasket to the intake air surge tank assembly with the protrusion of the throttle body gasket oriented as shown in the illustration. *a Protrusion 2. INSTALL THROTTLE BODY WITH MOTOR ASSE

 Components

COMPONENTS ILLUSTRATION *1 BATTERY CLAMP SUB-ASSEMBLY - - N*m (kgf*cm, ft.*lbf): Specified torque - - ILLUSTRATION *1 FRONT LOWER NO. 1 FLOOR HEAT INSULATOR - - N*m (kgf*cm, ft.*lbf): Specified torque - - ILLUSTRATION *1 NO. 1 CONSOLE BOX DUCT

© 2016-2024 Copyright www.lexguide.net