Lexus ES manuals

Lexus ES: Fail-safe Chart

FAIL-SAFE CHART

DIAGNOSIS FUNCTION

  • Heated steering wheel controller (steering vibration ECU) has diagnosis function.

    Condition

    Detection Condition

    Response when malfunction detected

    Recovery Conditions

    ECU malfunction

    Internal malfunction detected in the heated steering wheel controller (steering vibration ECU)

    ECU reset

    Malfunctions cleared during reset

    Thermistor malfunction

    When an open circuit or short occurs in the thermistor inside the steering wheel assembly for 2 seconds or more

    Heater output off

    Normal condition of the thermistor is restored

    Heater OFF request signal received

    Heater malfunction

    Overcurrent protection or overheating protection operates

    Heater output off

    Heater OFF request signal received

    Lost communication

    Lost communication with air conditioning amplifier assembly continuously for 15 seconds

    Heater output off

    Normal communication continues for 10 seconds

FAIL-SAFE FUNCTION

Content

Operation

ECU malfunction

Internal malfunction detected in the heated steering wheel controller (steering vibration ECU)

ECU reset

Heater malfunction

Drive element overcurrent detection

Heater output off

Drive element overheat detection

Heater output off

Power source malfunction

Low-voltage detection

Heater output off

Overvoltage detection

Heater output off

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 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 pa

 Diagnostic Trouble Code Chart

DIAGNOSTIC TROUBLE CODE CHART HEATED STEERING WHEEL SYSTEM DTC No. Detection Item Link B14B7 Lost Communication with Steering Heater ECU

 Lost Communication with Steering Heater ECU (B14B7)

DESCRIPTION The heated steering wheel controller (steering vibration ECU) communicates with the air conditioning amplifier assembly via LIN communication. B14B7 is output when a communication malfunct

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 Components

COMPONENTS ILLUSTRATION *1 COURTESY LIGHT ASSEMBLY *2 REAR DOOR ILLUMINATION LIGHT (REAR DOOR OUTSIDE HANDLE ASSEMBLY) *3 REAR DOOR SERVICE HOLE COVER *4 REAR DOOR TRIM BOARD SUB-ASSEMBLY *5 REAR DOOR TRIM UPPER PAD *6 REAR POWER WINDOW REGULATOR SWITCH ASSEMBLY WITH RE

 Dtc Check / Clear

DTC CHECK / CLEAR CHECK DTC (a) Connect the Techstream to the DLC3. (b) Turn the power switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / (desired system) / Trouble Codes. Body Electrical > Master Switch > Trouble Codes Body Electrical > D-Door Moto

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