Heated Steering Wheel System Steering Wheel Does Not Heat Up When Heated Steering Wheel Switch Is Pressed

Steering. Land Cruiser. Urj200, 202 Grj200 Vdj200
Steering Column. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT STEERING WHEEL ASSEMBLY (THERMISTOR·HEATER·THERMOSTAT)

INSPECT SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY

INSPECT REFRESHING SEAT SWITCH (STEERING HEATER SWITCH)

CHECK HARNESS AND CONNECTOR (STEERING HEATER SWITCH - SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY)

CHECK HARNESS AND CONNECTOR (IG CIRCUIT)

CHECK HARNESS AND CONNECTOR (IG CIRCUIT)

CHECK HARNESS AND CONNECTOR (SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY BODY GROUND)

HEATED STEERING WHEEL SYSTEM - Steering Wheel does not Heat Up When Heated Steering Wheel Switch is Pressed


DESCRIPTION

(Click here)

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Steering Column.Power Tilt And Power Telescopic Steering Column System.Heated Steering Wheel System Steering Wheel Does Not Heat Up When Heated Steering Wheel Switch Is Pressed


Land Cruiser. Urj200, 202 Grj200 Vdj200.Steering Column.Power Tilt And Power Telescopic Steering Column System.Heated Steering Wheel System Steering Wheel Does Not Heat Up When Heated Steering Wheel Switch Is Pressed


INSPECTION PROCEDURE

HINT:
  1. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  2. The steering heater unit is built into the steering wheel assembly which cannot be disassembled. Therefore, when the steering heater unit has a malfunction, replace the steering wheel assembly.
1.INSPECT STEERING WHEEL ASSEMBLY (THERMISTOR·HEATER·THERMOSTAT)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Steering Column.Power Tilt And Power Telescopic Steering Column System.Heated Steering Wheel System Steering Wheel Does Not Heat Up When Heated Steering Wheel Switch Is Pressed

  1. Disconnect the B steering wheel heater control connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    B-1 (TH1) - B-2 (TH2)
    		10 to 30°C (50 to 86°F)
    		8.132 to 18.43 kΩ
    B-4 (SH1) - B-3 (SH2)
    		20°C (68°F)
    		1.89 to 2.25 Ω
    Text in Illustration
    *a
    		Component without harness connected
    (Steering Wheel Assembly)


NG
REPLACE STEERING WHEEL ASSEMBLY (Click here)
OK


2.INSPECT SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY

  1. Check the connectors and cables of the spiral with sensor cable sub-assembly.

    OK:
    There are no defects such as scratches, cracks, dents or damage on the connectors or cables.


  1. Disconnect the E140*1 or E107*2 and z74 spiral with sensor cable sub-assembly connectors.

    1. *1: w/ Door Ajar Warning Buzzer
    2. *2: w/o Door Ajar Warning Buzzer

    Land Cruiser. Urj200, 202 Grj200 Vdj200.Steering Column.Power Tilt And Power Telescopic Steering Column System.Heated Steering Wheel System Steering Wheel Does Not Heat Up When Heated Steering Wheel Switch Is Pressed


    Text in Illustration
    *A
    		w/ Door Ajar Warning Buzzer
    		*B
    		w/o Door Ajar Warning Buzzer
    *a
    		Component without harness connected
    (Spiral with Sensor Cable Sub-assembly)
    		-
    		-

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

    Standard Resistance:
    w/ Door Ajar Warning Buzzer
    Tester Connection
    		Condition
    		Specified Condition
    z74-1 - E140-1 (BTM)
    		Always
    		Below 1 Ω
    z74-2 - E140-3 (ETM)
    		Always
    		Below 1 Ω
    z74-3 - E140-2 (EHT)
    		Always
    		Below 1 Ω
    z74-4 - E140-4 (BHT)
    		Always
    		Below 1 Ω
    w/o Door Ajar Warning Buzzer
    Tester Connection
    		Condition
    		Specified Condition
    z74-1 - E107-1 (BTM)
    		Always
    		Below 1 Ω
    z74-2 - E107-3 (ETM)
    		Always
    		Below 1 Ω
    z74-3 - E107-2 (EHT)
    		Always
    		Below 1 Ω
    z74-4 - E107-4 (BHT)
    		Always
    		Below 1 Ω


NG
REPLACE SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY (Click here)
OK


3.INSPECT REFRESHING SEAT SWITCH (STEERING HEATER SWITCH)

  1. Remove the steering heater switch (Click here).

  1. Inspect the steering heater switch (Click here).



NG
REPLACE REFRESHING SEAT SWITCH (Click here)
OK


4.CHECK HARNESS AND CONNECTOR (STEERING HEATER SWITCH - SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY)

  1. Disconnect the V7 steering heater switch connector.

  1. Disconnect the E140*1 or E107*2 spiral with sensor cable sub-assembly connector.

    1. *1: w/ Door Ajar Warning Buzzer
    2. *2: w/o Door Ajar Warning Buzzer

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

    Standard Resistance:
    w/ Door Ajar Warning Buzzer
    Tester Connection
    		Condition
    		Specified Condition
    V7-4 (+) - E140-1 (BTM)
    		Always
    		Below 1 Ω
    V7-8 (IN) - E140-3 (ETM)
    		Always
    		Below 1 Ω
    w/o Door Ajar Warning Buzzer
    Tester Connection
    		Condition
    		Specified Condition
    V7-4 (+) - E107-1 (BTM)
    		Always
    		Below 1 Ω
    V7-8 (IN) - E107-3 (ETM)
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.CHECK HARNESS AND CONNECTOR (IG CIRCUIT)

  1. Disconnect the V7 steering heater switch connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    V7-1 (IG) - Body ground
    		Ignition switch ON
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.CHECK HARNESS AND CONNECTOR (IG CIRCUIT)

  1. Disconnect the E140*1 or E107*2 spiral with sensor cable subassembly connector.

    1. *1: w/ Door Ajar Warning Buzzer
    2. *2: w/o Door Ajar Warning Buzzer

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

    Standard Voltage:
    w/ Door Ajar Warning Buzzer
    Tester Connection
    		Switch Condition
    		Specified Condition
    E140-4 (BHT) - Body ground
    		Ignition switch ON
    		11 to 14 V
    w/o Door Ajar Warning Buzzer
    Tester Connection
    		Switch Condition
    		Specified Condition
    E107-4 (BHT) - Body ground
    		Ignition switch ON
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


7.CHECK HARNESS AND CONNECTOR (SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY BODY GROUND)

  1. Disconnect the E140*1 or E107*2 spiral with sensor cable sub-assembly connector.

    1. *1: w/ Door Ajar Warning Buzzer
    2. *2: w/o Door Ajar Warning Buzzer

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

    Standard Resistance:
    w/ Door Ajar Warning Buzzer
    Tester Connection
    		Condition
    		Specified Condition
    E140-2 (EHT) - Body ground
    		Always
    		Below 1 Ω
    w/o Door Ajar Warning Buzzer
    Tester Connection
    		Condition
    		Specified Condition
    E107-2 (EHT) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE STEERING WHEEL ASSEMBLY (Click here)