Lexus ES manuals

Lexus ES: Steering Wheel does not Heat Up When Heated Steering Wheel Switch is Pressed

Lexus ES (XZ10) Service Manual / Steering / Steering Column / Heated Steering Wheel System (for Gasoline Model) / Steering Wheel does not Heat Up When Heated Steering Wheel Switch is Pressed

DESCRIPTION

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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

NOTICE:

The vehicle is equipped with a Supplemental Restraint System (SRS) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the precaution for Supplemental Restraint System.

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PROCEDURE

1.

INSPECT STEERING WHEEL ASSEMBLY (THERMOSTAT, HEATER AND THERMISTOR)

(a) Disconnect the B heated steering wheel controller (steering vibration ECU) connector.

*a

Component without harness connected

(Steering Wheel Assembly)

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

Standard Resistance (for F SPORT Models):

Tester Connection

Condition

Specified Condition

B-1 (SH1) - B-4 (SH3)

20°C (68°F)

2.52 to 3.00 Ω

B-1 (SH1) - B-5 (SH2)

20°C (68°F)

2.52 to 3.00 Ω

B-2 (TH1) - B-3 (TH2)

10 to 30°C (50 to 86°F)

4.228 to 8.701 kΩ

Standard Resistance (except F SPORT Models):

Tester Connection

Condition

Specified Condition

B-1 (SH1) - B-4 (SH3)

20°C (68°F)

2.33 to 2.77 Ω

B-1 (SH1) - B-5 (SH2)

20°C (68°F)

2.33 to 2.77 Ω

B-2 (TH1) - B-3 (TH2)

10 to 30°C (50 to 86°F)

4.228 to 8.701 kΩ

OK

REPLACE HEATED STEERING WHEEL CONTROLLER (STEERING VIBRATION ECU)

NG

REPLACE STEERING WHEEL ASSEMBLY

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