Lexus ES manuals

Lexus ES: Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

NOTICE:

  • Before replacing the hybrid vehicle control ECU, refer to Registration.

    Click here

  • 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 and 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.

    Click here

  • When replacing the forward recognition camera, 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 and a DTC may be stored.
  • If the forward recognition camera has been replaced with a new one or the windshield glass has been removed and installed, it is necessary to perform forward recognition camera adjustment.

    HINT:

    Forward recognition camera adjustment can be performed by using either One Time Recognition or Sequential Recognition.

    One Time Recognition: Click here

    Sequential Recognition: Click here

HINT:

  • Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
  • Inspect the fuses and relays related to this system before inspecting the suspected areas below.
  • Determine the problem systems, then perform the respective inspection procedures.
  • By using the vehicle control history, various control parameter history can be checked.
Dynamic Radar Cruise Control System

Symptom

Suspected Area

Link

The dynamic radar cruise control system cannot be turned on using the cruise control main switch

CAN communication system

Steering pad switch circuit

Cruise main indicator light circuit

Forward recognition camera

Hybrid vehicle control ECU

The dynamic radar cruise control mode cannot be changed between vehicle-to-vehicle distance control mode and constant speed control mode

CAN communication system

Steering pad switch circuit

Hybrid vehicle control ECU

The vehicle-to-vehicle distance cannot be changed

CAN communication system

Distance control switch circuit

Forward recognition camera

Vehicle speed setting cannot be performed (in constant speed control mode)

Fail-safe chart

CAN communication system

Steering pad switch circuit

Stop light switch circuit

Hybrid control system

Electronically controlled brake system

Forward recognition camera

Hybrid vehicle control ECU

Vehicle speed setting cannot be performed (in vehicle-to-vehicle distance control mode)

Fail-safe chart

Forward recognition camera is temporarily unavailable

Millimeter wave radar sensor assembly is dirty

Millimeter wave radar sensor assembly beam axis not adjusted

CAN communication system

Steering pad switch circuit

Hybrid control system

Millimeter wave radar sensor assembly

Forward recognition camera

Electronically controlled brake system

Hybrid vehicle control ECU

Control of vehicle speed by the dynamic radar cruise control system is canceled (in constant speed control mode)

Fail-safe chart

CAN communication system

Steering pad switch circuit

Stop light switch circuit

Hybrid control system

Electronically controlled brake system

Hybrid vehicle control ECU

Control of vehicle speed by the dynamic radar cruise control system is canceled (in vehicle-to-vehicle distance control mode)

Fail-safe chart

Forward recognition camera is temporarily unavailable

Millimeter wave radar sensor assembly is dirty

Millimeter wave radar sensor assembly beam axis not adjusted

CAN communication system

Steering pad switch circuit

Hybrid control system

Millimeter wave radar sensor assembly

Forward recognition camera

Electronically controlled brake system

Hybrid vehicle control ECU

Hunting/vehicle speed is not constant (in constant speed control mode)

CAN communication system

Electronically controlled brake system

Hybrid vehicle control ECU

Hunting/vehicle speed is not constant (in vehicle-to-vehicle distance control mode)

Millimeter wave radar sensor assembly is dirty

Millimeter wave radar sensor assembly beam axis not adjusted

CAN communication system

Electronically controlled brake system

Millimeter wave radar sensor assembly

Hybrid vehicle control ECU

Vehicle speed control by the dynamic radar cruise control system is not canceled when the CANCEL switch is pushed

Steering pad switch circuit

Hybrid vehicle control ECU

Moving the shift lever does not cancel control of vehicle speed by the dynamic radar cruise control system

Shift lock control unit assembly

Shift lever position sensor

Hybrid control system

Hybrid vehicle control ECU

Vehicle speed control by the dynamic radar cruise control system is not canceled when a shift paddle switch is operated

Hybrid control system

Shift paddle switch circuit

Hybrid vehicle control ECU

Depressing the brake pedal does not cancel control of vehicle speed by the dynamic radar cruise control system

Stop light switch circuit

Hybrid vehicle control ECU

Control cannot be canceled while the vehicle is stopped

CAN communication system

Electronically controlled brake system

Electric parking brake system

Seat belt warning system

Front door courtesy switch circuit

Hybrid vehicle control ECU

Control cannot be canceled by operating the parking brake

Electric parking brake system

CAN communication system

Brake actuator assembly

Hybrid vehicle control ECU

Even though the millimeter wave radar sensor assembly and forward recognition camera are not dirty, the warning message "Radar Cruise Control Unavailable See Owner's Manual" is displayed

Millimeter wave radar sensor assembly

Forward recognition camera

The vehicle approach warning buzzer does not sound

Meter / gauge system

Check millimeter wave radar sensor assembly installation position

Check installation of forward recognition camera

Forward recognition camera

Millimeter wave radar sensor assembly

Even though the vehicle approach warning buzzer is sounding, brake control is not performed to decelerate the vehicle

Electronically controlled brake system

CAN communication system

Forward recognition camera

Hybrid vehicle control ECU

Even though the SET function is operating, the cruise SET indicator does not illuminate

CAN communication system

Cruise SET indicator light circuit

Hybrid vehicle control ECU

The cruise control indicator remains illuminated

CAN communication system

Cruise main indicator light circuit

Hybrid vehicle control ECU

Indicators are not displayed on the multi-information display in the combination meter assembly

CAN communication system

Hybrid vehicle control ECU

A buzzer does not sound when control of vehicle speed by the dynamic radar cruise control is canceled

CAN communication system

Hybrid vehicle control ECU

READ NEXT:

 Terminals Of Ecu

TERMINALS OF ECU CHECK HYBRID VEHICLE CONTROL ECU Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition A32-15 (STP) - G59-6 (E1) GR - W-B Stop ligh

 Diagnosis System

DIAGNOSIS SYSTEM DIAGNOSIS FUNCTION (a) The diagnosis function turns off the cruise control indicator, illuminates the master warning light and displays a warning message when a malfunction is detecte

 Dtc Check / Clear

DTC CHECK / CLEAR NOTICE: When the diagnosis system is changed from normal mode to check mode or vice versa, all DTCs and freeze frame data recorded in normal mode are cleared. Before changing modes,

SEE MORE:

 Accumulator Pressure Sensor Stuck (C14D5)

DESCRIPTION The accumulator pressure sensor is built into the brake booster with master cylinder assembly and detects the accumulator pressure. If the skid control ECU (brake booster with master cylinder assembly) detects that the accumulator pressure sensor value is below the threshold, operation o

 Installation

INSTALLATION PROCEDURE 1. INSTALL REAR DIFFERENTIAL SUPPORT (a) Install the rear differential support to the rear differential carrier assembly with 4 new bolts. Torque: 72 N·m {734 kgf·cm, 53 ft·lbf} 2. INSTALL REAR NO. 1 DIFFERENTIAL SUPPORT (a) Install the rear No. 1 differential support to t

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